Research Presentations

2025

(5 presentations)

[132] (To be presented) Defect rich thermoelectric materials and device physics
ICT/ACT 2025, Sendai, Japan, on 2025-Jun-18 (2025).
Authors: Ryu, Byungki; Park, Sungjin; Wani, Aadil Fayaz; Chung, Jaywan; Park, SuDong
Presentation Type: Invited Talk

[131] (To be presented) Thermoelectric Algebra Made Simple for Thermoelectric Generator Module Performance Prediction under Constant Seebeck Coefficient Approximation
ICT/ACT 2025, Sendai, Japan, on 2025-Jun-17 (2025).
Authors: Ryu, Byungki; Oh, Seunghyun; Demeke, Wabi; Chung, Jaywan; Park, Jongho; Kumari, Nirma; Wani, Aadil Fayaz; Ryu, Seunghwa; Park, SuDong
Presentation Type: Poster

[130] (To be presented) Layered XZnBi (X = Rb, Cs) with Pudding-Mold Band Structure and Low Thermal Conductivity: A First-Principles Study of Thermoelectric Properties
ICT/ACT 2025, Sendai, Japan, on 2025-Jun-16 (2025).
Authors: Wani, Aadil Fayaz; Kumari, Nirma; Park, SuDong; Ryu, Byungki
Presentation Type: Poster

[129] (To be presented) Thermal Stability Study of Bi0.5Sb1.5Te3 - Ag alloy for thermoelectric conversion
ICT/ACT 2025, Sendai, Japan, on 2025-Jun-16 (2025).
Authors: Kumari, Nirma; Son, Ji Hui; Park, Jongho; Jang, Jeongin; Oh, Seunghyun; Wani, Aadil Fayaz; Ryu, Byungki; Park, SuDong
Presentation Type: Poster

[128] (To be presented) Enhancing stability of Mg2(Si,Sn) solid solutions for sustainable applications
ICT/ACT 2025, Sendai, Japan, on 2025-Jun-16 (2025).
Authors: Duparchy, Amandine; Ryu, Byungki; Mueller, Eckhard; de Boor, Johannes
Presentation Type: not determined

2024

(8 presentations)

[127] Thermoelectric Device Physics: Bridging the performance gap between materials and modules
ENGE 2022, Shinhwa Resort, Landing, Jeju, on 2024-Nov-26 (2024).
Authors: Ryu, Byungki; Chung, Jaywan; Park, SuDong
Presentation Type: Invited Talk

[126] Understanding Thermoelectric Instability in Mg-based Thermoelectric Alloys
대한금속재료학회(KIM) 2024 Fall, Alpensia, Pyeongchang, Korea, on 2024-Oct-28 (2024).
Authors: Ryu, Byungki; Jang, Jeongin; Park, Jongho; Son, Ji-Hee; Park, Sungjin; Park, SuDong; Ayachi, Sahar; Duparchy, Amandine; Mueller, Eckhard; de Boor, Johannes
Presentation Type: 열전분과 Oral

[125] 열전방정식 유한요소해석을 통한 숏레그형-중온용 열전발전소자의 출 력 성능과 기생저항의 영향 분석
대한금속재료학회(KIM) 2024 Fall, Alpensia, Pyeongchang, Korea, on 2024-Oct-28 (2024).
Authors: Oh, Seunghyun; Park, Jongho; Chung, Jaywan; Park, SuDong; Ryu, Byungki
Presentation Type: 열전분과 Oral

[124] Micro/Nano-Scale Characterization of Magnesium Silicide-based Composites: Correlating Kelvin Probe Force Microscopy with SEM/EDX Analysis
ICT/ECT 2024, Krakow, Poland, on 2024-Jul-03 (2024).
Authors: Ghosh, S; Abdelbaky, M; Ryu, Byungki; Mertin, W; Müller, E; de Boor, J
Presentation Type: Oral

[123] Fabricating Durable Silicide-Telluride Thermoelectric Modules through Chemically-Thermally-Designed Joining Process for Multiple Usability
ICT/ECT 2024, Krakow, Poland, on 2024-Jul-02 (2024).
Authors: Park, Jongho; Jang, Jeongin; Ryu, Byungki; Park, SuDong
Presentation Type: Poster

[122] Thermoelectric Instability in Mg-based Thermoelectric Alloys
ICT/ECT 2024, Krakow, Poland, on 2024-Jul-01 (2024).
Authors: Ryu, Byungki; Park, Sungjin; Jang, Jeongin; Park, Jongho; Son, Ji-Hee; Chung, Jaywan; Ayachi, S; Duparchy, A; Mueller, E; de Boor, J; Park, SuDong
Presentation Type: Oral

[121] 열전 튜토리얼- 열전 발전 소자와 에너지 변환의 이해
대한금속재료학회(KIM) 2024 Spring, CECO, Changwon, Korea, on 2024-Apr-26 (2024).
Authors: Ryu, Byungki
Presentation Type: Oral

[120] Role of Impurity Defects in Thermoelectric Material Property Degradation of Mg₂(Si,Sn) Modules
APS March Meeting 2024, Minneapolis, US, on 2024-Mar-06 (2024).
Authors: Ryu, Byungki; Ayachi, Sahar; Park, Sungjin; Park, SuDong; Mueller, Eckhard; de Boor, Johannes
Presentation Type: Oral

2023

(15 presentations)

[119] Exploring Best Thermoelectric Device Efficiency by Using Integral Formalism and Thermoelectric Properties Big Data: A Theoretical Approach
MRM2023/IUMRS-ICA2023, Kyoto, Japan, on 2023-Dec-14 (2023).
Authors: Ryu, Byungki
Presentation Type: Invited Talk

[118] Algebraic Approach to Predicting Thermoelectric Power Module Performance: with Temperature Dependent Properties and Contact Resistance
대한금속재료학회(KIM) 2023 Fall, EXCO, Daegu, Korea, on 2023-Oct-25 (2023).
Authors: Ryu, Byungki; Chung, Jaywan; Park, SuDong
Presentation Type: Oral

[117] Thermoelectric Efficiency: From Data to Future, From Materials to Devices
Tsukuba Conference, Tsukuba, Japan, on 2023-Sep-26 (2023).
Authors: Ryu, Byungki
Presentation Type: Invited Talk

[116] Fabrication of High Power Density Telluride-based Thermoelectric Generator Module for Mid-Temperature Applications below 550 oC
19 th European Conference on Thermoelectrics (ECT 2023), Prague, Czech Republic, on 2023-Sep-17 (2023).
Authors: Park, JongHo; Chung, Jaywan; Ryu, Byungki; Park, SuDong
Presentation Type: Poster

[115] Best thermoelectric efficiency exploration by solving thermoelectric integral equation over material big data of Starrydata2
19 th European Conference on Thermoelectrics (ECT 2023), Prague, Czech Republic, on 2023-Sep-17 (2023).
Authors: Ryu, Byungki; Chung, Jaywan; Kumagai, Masaya; Katsura, Yukari; Park, SuDong
Presentation Type: Oral

[114] Thermoelectric algebraic representation: equations and inequalities for simple thermoelectric device design
19 th European Conference on Thermoelectrics (ECT 2023), Prague, Czech Republic, on 2023-Sep-17 (2023).
Authors: Ryu, Byungki; Chung, Jaywan; Park, Sungjin; Park, SuDong
Presentation Type: nan

[113] Thermoelectric Integral equations for efficiency calculations with temperature- dependent properties and interface resistances: a comprehensive framework from materials to devices
ICT 2023, Seattle, US, on 2023-Jun-23 (2023).
Authors: Ryu, Byungki; Chung, Jaywan; Park, Jongho; Lee, Jaeki; Jang, Jeongin; Park, Sungjin; Katsura, Yukari; de Boor, Johannes; Ziolkowski, Pawel; Park, SuDong
Presentation Type: Invited Talk

[112] Combining electronic defect calculations with microprobe meas-urements for accelerated Mg2X-based TE device development
ICT 2023, Seattle, US, on 2023-Jun-21 (2023).
Authors: de Boor, Johannes; Ayachi, Sahar; Deshpande, Deshpande; Park, Sungjin; Bahrami, Amin; He, Ran; Ying, Pingjun; Nielsch, Kornelius; Ryu, Byungki; Park, SuDong; Mueller, Eckhard
Presentation Type: Invited Talk, Co-author

[111] Best Thermoelectric Efficiency Map on Thermoelectric Big Data
대한금속재료학회(KIM) 2023 Spring, Jeju ICC, Jeju, Korea, on 2023-Apr-27 (2023).
Authors: Ryu, Byungki; Chung, Jaywan; Kumagai, Masaya; Katsura, Yukari; Park, SuDong
Presentation Type: Oral

[110] Development of segmented thermoelectric power module using higher-manganese silicides and other thermoelectric semiconductors
대한금속재료학회(KIM) 2023 Spring, Jeju ICC, Jeju, Korea, on 2023-Apr-26 (2023).
Authors: Ryu, Byungki; Park, Jongho; Jang, Jeongin; Lee, Jae Ki; Chung, Jaywan; de Boor, Johannes; Ziolkowski, Pawel; Park, SuDong
Presentation Type: Oral

[109] Fabrication of telluride-based thermoelectric power generator module for high-power density electricity generation for mid-temperature applications
대한금속재료학회(KIM) 2023 Spring, Jeju ICC, Jeju, Korea, on 2023-Apr-26 (2023).
Authors: Park, Jongho; Jang, Jeongin; Chung, Jaywan; Park, SuDong; Ryu, Byungki
Presentation Type: Oral

[108] Thermoelectric properties and thermal stability of Higher Manganese
대한금속재료학회(KIM) 2023 Spring, Jeju ICC, Jeju, Korea, on 2023-Apr-26 (2023).
Authors: Jang, Jeongin; Chung, Jaywan; Ryu, Byungki; Park, SuDong
Presentation Type: Poster

[107] Best Thermoelectric Efficiency Map on Ever-Explored Materials: toward Device Physics, beyond Materials
KPS 2023 Spring, DCC, Daejeon, Korea, on 2023-Apr-19 (2023).
Authors: Ryu, Byungki; Chung, Jaywan; Kumagai, Masaya; Katsura, Yukari; Park, SuDong
Presentation Type: Invited Talk

[106] Exploring best thermoelectric efficiency from of more than 10⁴ explored thermoelectric materials and 10⁸ device efficiency calculations
APS March Meeting 2023, Las Vegas, NV, US, on 2023-Mar-06 (2023).
Authors: Ryu, Byungki; Chung, Jaywan; Kumagai, Masaya; Katsura, Yukari; Park, SuDong
Presentation Type: Oral

[105] (New) Approaches in TE Science at KERI
AIST-KERI meeting at KERI, KERI, Changwon, Korea, on 2023-Feb-20 (2023).
Authors: Ryu, Byungki
Presentation Type: Seminar

2022

(8 presentations)

[104] 2022 대한민국과학기술대전
nan, KINTEX, Ilsan, Korea, on 2022-Dec-15 (2022).
Authors: 류, 병기; 정, 재환; 박, 수동
Presentation Type: nan

[103] Constant Seebeck-coefficient Approximation (CSA) and Average Thermoelectric Figure of Merit
ENGE 2022, Ramada Jeju Hotel, Jeju, Korea, on 2022-Nov-09 (2022).
Authors: Ryu, Byungki; Chung, Jaywan; Park, Sungjin; Park, SuDong
Presentation Type: Oral

[102] Diffusion of Intrinsic and Extrinsic Defects in Mg2X (X = Si, Sn): Hybrid Density Functional Study
ENGE 2022, Ramada Jeju Hotel, Jeju, Korea, on 2022-Nov-09 (2022).
Authors: Park, Sungjin; Ryu, Byungki; Park, SuDong
Presentation Type: Oral

[101] Thermoelectric Figure of Merit Under Constant Seebeck Coefficients
ENGE 2022, Ramada Jeju Hotel, Jeju, Korea, on 2022-Nov-09 (2022).
Authors: Chung, Jaywan; Ryu, Byungki; Seo, Hyowon
Presentation Type: Oral

[100] Prediction of intrinsic and extrinsic interface formation energy using a universal Inter-Atomic Potential based on graph neural networks with three-body interactions
KPS 2022 Fall, BEXCO, Busan, Korea, on 2022-Oct-19 (2022).
Authors: Ryu, Byungki; Choi, Eun-Ae; Park, Sungjin; Han, Seung Zeon; Park, SuDong; Chung, Jaywan
Presentation Type: Oral

[99] Thermoelectric integral equations and algebraic approximation for thermoelectric power generator devices
Korean Society for Computational Science and Engineering (KSCSE) 2022 Fall, The K Seoul Hotel, Seoul, Korea, on 2022-Sep-30 (2022).
Authors: Ryu, Byungki; Chung, Jaywan; Park, SuDong
Presentation Type: Poster

[98] Thermoelectric Equations for Materials design and discovery, and Devices optimization
Applied PDE and Machine Learning Workshop, AORC, SKKU-Math, Suwon, South Korea, on 2022-Sep-16 (2022).
Authors: Ryu, Byungki
Presentation Type: Seminar

[97] Defects responsible for TE performance degradation in material and contact metal interface: Ag as an example for Mg2(Si,Sn) TE power generator
대한금속재료학회(KIM) 2022 Spring, CECO, Changwon, Korea, on 2022-Apr-27 (2022).
Authors: Ryu, Byungki; Ayachi, Sahar; Camut, Julia; de Boor, Johannes; Mueller, Eckhard; Chung, Jaywan; Park, SuDong
Presentation Type: Oral

2021

(9 presentations)

[96] Thermoelectric Efficiency Theory for Temperature-Dependent Thermoelectric Properties
MRS 2021 Fall, Boston (hybrid), US, on 2021-Dec-07 (2021).
Authors: Ryu, Byungki
Presentation Type: Invited Talk

[95] Thermoelectric Degrees of Freedom determining Thermoelectric Efficiency, beyond ZT
Special Symposium on Thermoelectrics, Hidden Cliff Hotel & Nature, Jeju, Korea, on 2021-Nov-25 (2021).
Authors: Ryu, Byungki
Presentation Type: Invited Talk

[94] Computation and data-driven research on thermoelectric materials and devices for high thermoelectric conversion efficiency
KRICT Seminar, KRICT, Daejeon, Korea, on 2021-Nov-10 (2021).
Authors: Ryu, Byungki
Presentation Type: Seminar

[93] Thermoelectric Degrees of Freedom determining Thermoelectric Efficiency
2021 Korean Ceramic Society (KCS) Fall Meeting, Online, Korea, on 2021-Nov-04 (2021).
Authors: Ryu, Byungki; Chung, Jaywan; Park, SuDong
Presentation Type: nan

[92] Computation and Data-driven Research on Thermoelectric Materials and Devices Design
KPS 2021 Fall, Online, Korea, on 2021-Oct-21 (2021).
Authors: Ryu, Byungki; Chung, Jaywan; Park, SuDong
Presentation Type: Invited Talk

[91] Hybrid density functional study of the energetics and electrical properties of metastable Mg9Sn5
대한금속재료학회(KIM) 2021 Fall, Jeju, Korea, on 2021-Oct-20 (2021).
Authors: Park, Sungjin; Park, SoDong; Ryu, Byungki
Presentation Type: Oral

[90] General Efficiency Theory of Thermoelectric Heat Engine, Three instead of One: beyond ZT, toward Material and Device Design
대한금속재료학회(KIM) 2021 Spring, Wellihillipark, Hoengseong, Korea, on 2021-Apr-30 (2021).
Authors: Ryu, Byungki; Chung, Jaywan; Park, SuDong
Presentation Type: Oral

[89] 열전소재 성능평가를 위한 효율계산 연구
대한금속재료학회(KIM) 2021 Spring, Wellihillipark, Hoengseong, Korea, on 2021-Apr-29 (2021).
Authors: Ryu, Byungki; Chung, Jaywan; Park, SuDong
Presentation Type: Oral

[88] Thermoelectric efficiency of thermoelectric heat engine with temperature dependent transport properties
KPS 2021 Spring, Virtual, Korea, on 2021-Apr-21 (2021).
Authors: Ryu, Byungki; Chung, Jayawn; Park, SuDong
Presentation Type: Invited Talk

2020

(4 presentations)

[87] 열전 발전 소자: 소재와 소자 설계 기술
대창 세미나, Daechang Co., Ltd., Siheung-si, Gyeonggi-do, Korea, on 2020-Nov-11 (2020).
Authors: Ryu, Byungki
Presentation Type: Seminar

[86] Thermoelectric ZT Paradox: 열전성능지수 ZT와 열전에너지변환효율에 대한 비직관적 관계에 대한 보고
대한금속재료학회(KIM) 2020 Fall, Virtual, Korea, on 2020-Oct-28 (2020).
Authors: Ryu, Byungki; Chung, Jaywan; Park, SuDong
Presentation Type: Oral

[85] Off-centered Pb interstitials in pristine PbTe
대한금속재료학회(KIM) 2020 Fall, Online, Korea, on 2020-Oct-28 (2020).
Authors: Park, Sungjin; Park, Jongho; Ryu, Byungki; Park, SuDong
Presentation Type: Oral

[84] Thermoelectric Transport in Solids for Power Generation
경북대학교 물리학과 Colloquium, Kyungpook National University, Daegu, South Korea, on 2020-Oct-07 (2020).
Authors: Ryu, Byungki
Presentation Type: Seminar

2019

(11 presentations)

[83] BRyu_20190705_German-Korean TE workshop Daegu, Korea v2(update QnA)).pptx
6th German-Korea Thermoelectric Workshop, Daegu, Korea, on 2019-Jul-06 (2019).
Authors: Ryu, Byungki; Chung, Jaywan; Lee, Jae Ki; Park, Jongho; Park, SuDong
Presentation Type: Oral

[82] General Efficiency Theory of Thermoelectric Conversion
The 38th International Conference on Thermoelectrics (ICT) and The 4th Asian Conference on Thermoelectrics (ACT), Gyeongju, Korea, on 2019-Jul-04 (2019).
Authors: Ryu, Byungki; Chung, Jaywan; Park, SuDong
Presentation Type: Invited Talk

[81] Machine-Learning-based Prediction for Contact Resistance in Thermoelectric Modules
The 38th International Conference on Thermoelectrics (ICT) and The 4th Asian Conference on Thermoelectrics (ACT), Gyeongju, Korea, on 2019-Jul-03 (2019).
Authors: Chung, Jaywan; Ryu, Byungki; Lee, Jae Ki; Park, SuDong
Presentation Type: Oral

[80] Controlling Nano-twin Structure and Tuning zT for Segmented module in Bismuth Telluride-based Thermoelectric Material
The 38th International Conference on Thermoelectrics (ICT) and The 4th Asian Conference on Thermoelectrics (ACT), Gyeongju, Korea, on 2019-Jul-02 (2019).
Authors: Lee, Jae Ki; Park, SuDong; Lee, Min-Ho; Ryu, Byungki; Chung, Jaywan; Schierning, Gabi; Nielsch, Kornelius
Presentation Type: Oral

[79] Asymmetric Band Alignment Responsible for Minority Carrier Blocking in Bulk Mg2(Si,Ge,Sn) Thermoelectric Alloys: A First-Principles Study
The 38th International Conference on Thermoelectrics (ICT) and The 4th Asian Conference on Thermoelectrics (ACT), Gyeongju, Korea, on 2019-Jul-02 (2019).
Authors: Ryu, Byungki; Choi, Eun-Ae; Park, SuDong
Presentation Type: Poster

[78] Fabrication of thermoelectric power generators with segmented legs synthesized by one-step hot press sintering
The 38th International Conference on Thermoelectrics (ICT) and The 4th Asian Conference on Thermoelectrics (ACT), Gyeongju, Korea, on 2019-Jul-02 (2019).
Authors: Park, Jongho; Ryu, Byungki; Chung, Jaywan; Park, SuDong
Presentation Type: Poster

[77] Synthesis and characterization of ternary tetradymite Bi2Te2S
The 38th International Conference on Thermoelectrics (ICT) and The 4th Asian Conference on Thermoelectrics (ACT), Gyeongju, Korea, on 2019-Jul-02 (2019).
Authors: Joo, Sung-Jae; Ryu, Byungki; Son, Ji-Hee; Lee, Ji Eun; Min, Bok-Ki; Kim, Bong-Seo
Presentation Type: nan

[76] Possible existence of off-centered Pb interstitial in PbTe
The 38th International Conference on Thermoelectrics (ICT) and The 4th Asian Conference on Thermoelectrics (ACT), Gyeongju, Korea, on 2019-Jul-02 (2019).
Authors: Park, Sungjin; Ryu, Byungki
Presentation Type: Poster

[75] Thermoelectric Efficiency & Materials Properties
Seminar, Prof. Neophytos Neophytou’s Group in University of Warwick, UK, on 2019-Apr-11 (2019).
Authors: Ryu, Byungki
Presentation Type: Seminar

[74] Right Definition of Figure of Merit toward Themoelectric Efficiency Prediction for Segmented Devices
2019 APS March Meeting, Boston, Massachusetts, US, on 2019-Mar-04 (2019).
Authors: Ryu, Byungki; Chung, Jaywan; Park, SuDong
Presentation Type: Oral

[73] Density functional theory calculations of intrinsic defects in PbTe
2019 APS March Meeting, Boston, Massachusetts, US, on 2019-Mar-04 (2019).
Authors: Park, Sungjin; Lee, Min-Ho; Ryu, Byungki
Presentation Type: Oral

2018

(3 presentations)

[72] Thermoelectric Degrees of Freedom (DOFs)
Starrydata2-KERI meeting, University of Tokyo, Kashiwa Campus, Japan, on 2018-Aug-31 (2018).
Authors: Ryu, Byungki
Presentation Type: Seminar

[71] Thermoelectric Transport in Materials and Devices
Seminar, Prof. Muller's group, DLR, Koln, Germany, on 2018-Jul-09 (2018).
Authors: Ryu, Byungki
Presentation Type: Seminar

[70] Impurity-doping and Fermi-Level Tuning in Bi2Te3 related Alloys
2018 APS March Meeting, LA, CA, US, on 2018-Mar-06 (2018).
Authors: Ryu, Byungki; Chung, Jaywan; Lee, Jae Ki; Park, SuDong
Presentation Type: Oral

2017

(4 presentations)

[69] Predicting Thermo-Electric Performances of Telluride Materials and Devices
ICAE-2017, Jeju, Korea, on 2017-Nov-21 (2017).
Authors: Ryu, Byungki; Chung, Jaywan; Lee, Min-Ho; Lee, Jae Ki; Park, Jongho; Lee, Ji Eun; Kim, Bong-Seo; Park, SuDong
Presentation Type: Oral

[68] Approach of Density-Functional-Theory Calculations for Pb-Related Defects in PbTe
ICAE-2017, Jeju, Korea, on 2017-Nov-21 (2017).
Authors: Park, Sungjin; Lee, Min-Ho; Ryu, Byungki
Presentation Type: nan

[67] General Thermoelectric Figures of Merit for Thermoelectric Design
4th German-Korean Thermoelectric Workshop, Knappenberg, Austria, on 2017-Sep-22 (2017).
Authors: Ryu, Byungki; Chung, Jaywan; Park, SuDong
Presentation Type: Oral

[66] Electronic Structures and Band Alignments of Mg (Si, Ge, Sn) Thermoelectric Materials
2017 APS March Meeting, New Orleans, Louisiana, USA, on 2017-Mar-13 (2017).
Authors: Ryu, Byungki; Choi, Eun-Ae; Park, SuDong
Presentation Type: Oral

2016

(11 presentations)

[65] Thermoelectric computational simulations: material to device
KIMS Seminar, KIMS, Changwon, Korea, on 2016-Dec-23 (2016).
Authors: Ryu, Byungki
Presentation Type: Seminar

[64] Understanding, Calculating, and Predicting Thermoelectric effects: Materials to Devices Simulations
DGIST Seminar (Joongoo Kang), DGIST, Daegu, Korea, on 2016-Dec-16 (2016).
Authors: Ryu, Byungki
Presentation Type: nan

[63] Understanding, Calculating, and Predicting Thermoelectric Effects: from Materials to Devices
2016 Korean Ceramic Society Fall Meeting, COEX, Seoul, Korea, on 2016-Nov-24 (2016).
Authors: Ryu, Byungki; Chung, Jaywan; Park, SoDong
Presentation Type: Oral

[62] Calculation of Electric and Thermal Properties, and constructing HPC
BoHung Kim's Lab Seminar, University of Ulsan, Ulsan, Korea, on 2016-Oct-05 (2016).
Authors: Ryu, Byungki
Presentation Type: Seminar

[61] 제일원리 기반 열물성 계산
Summer Workshop of the Korean Society of Thermophyiscal Properties (KSTP), Muju, Korea, on 2016-Aug-18 (2016).
Authors: Ryu, Byungki
Presentation Type: Invited Talk

[60] Understanding, Calculating, Predicting ThermoElectric Effects: Materials to Devices
KBSI Seminar, KBSI, Daejeon, Korea, on 2016-Jun-24 (2016).
Authors: Ryu, Byungki
Presentation Type: Seminar

[59] Predicting Thermoelectric Properties of Bi-Te-Se Compounds: First-Principles Study
The 12th KIAS Electronic Structure Calculations Workshop, KIAS, Seoul, Korea, on 2016-Jun-17 (2016).
Authors: Ryu, Byungki
Presentation Type: Poster

[58] Effect of Band Alignments on Thermoelectric Properties of Telluride Composite: Theoretical and Experimental study
12th KIAS Electronic Structure Calculation Workshop, KIAS, Seoul, Korea, on 2016-Jun-16 (2016).
Authors: Lee, Min-Ho; Rhyee, Jong-Soo; Park, SuDong; Ryu, Byungki
Presentation Type: Poster

[57] Simulations on thermoelectricity: from materials to devices
Seunghwa Ryu's Lab Seminar, KAIST, Daejeon, Korea, on 2016-Mar-04 (2016).
Authors: Ryu, Byungki
Presentation Type: Seminar

[56] First principles study of Ag-defects in telluride thermoelectrics and BSE calculations using VASP
Chosun University Seminar (Seol Ryu's Lab), Chosun University, Gwangju, Korea, on 2016-Feb-22 (2016).
Authors: Ryu, Byungki
Presentation Type: Seminar

[1] Theoretical and experimental study: Enhancement of Thermoelectric performance in SnTe through the negative correlation effect between thermos-power and carrier density with Ag doping
2016 Korean Physical Society (KPS) Fall Meeting, Gwangju, Korea, on 1970-Jan-01 (2016).
Authors: Lee, Min-Ho; Rhyee, Jong-Soo; Ryu, Byungki
Presentation Type: Oral

2015

(5 presentations)

[55] DFT study of Thermoelectric & BSE calc. using VASP
UNIST Seminar (Prof. Noejung Park), UNIST, Ulsan, Korea, on 2015-Jul-17 (2015).
Authors: Ryu, Byungki
Presentation Type: Seminar

[54] The effect of meta-states control on thermoelectric properties in telluride compounds
34th International Conference on Thermoelectrics and 13th European Conference on Thermoelectrics, Dresden, Germany, on 2015-Jun-28 (2015).
Authors: Park, SuDong; Lee, Jae Ki; Ryu, Byungki; Lee, Ji Eun; Oh, Min-Wook; Joo, Sung-Jae; Kim, Bong-Seo; Min, Bok-Ki; Lee, Heewong
Presentation Type: nan

[53] Formation of Ag-related defects in Ag-doped PbTe thermoelectrics
11th KIAS Electronic Structure Calculation Workshop, KIAS, Seoul, Korea, on 2015-Jun-18 (2015).
Authors: Ryu, Byungki; Oh, Min-Wook; Lee, Jae Ki; Park, SuDong
Presentation Type: Poster

[52] First principles study of atomic and electronic structures of Ag-related defects in telluride thermoelectrics
KRISS Seminar, KRISS, Daejeon, Korea, on 2015-Jun-01 (2015).
Authors: Ryu, Byungki
Presentation Type: Seminar

[51] Density functional study of silver defects in telluride thermoelectric materials
2015 APS March Meeting, San Antonio, Texas, US, on 2015-Mar-04 (2015).
Authors: Ryu, Byungki; Oh, Min-Wook; Park, SuDong
Presentation Type: Oral

2014

(7 presentations)

[50] Silver Defects in Lead Tellurides
2014 TEW in KERI, Gyeongju Hilton, Korea, on 2014-Dec-18 (2014).
Authors: Ryu, Byungki
Presentation Type: Oral

[49] Silver in Tellurides
German TE in KERI: New Issue and Theory on TE, KERI, Changwon, Korea, on 2014-Nov-14 (2014).
Authors: Ryu, Byungki
Presentation Type: Seminar

[48] Defects responsible for n-type conductivity in Ag-doped PbTe: First-principles study
경희대국제캠퍼스 나노소재 모임, 경희대 국제캠퍼스 응용과학대학, 용인, Korea, on 2014-Oct-14 (2014).
Authors: Ryu, Byungki
Presentation Type: nan

[47] Atomic and electronic structure of Ag defects in PbTe
2014 ERMS Fall Meeting, Warsaw, Poland, on 2014-Sep-15 (2014).
Authors: Ryu, Byungki; Oh, Min-Wook; Park, Su-Dong
Presentation Type: Poster

[46] Density Functional Theory Study of Defects in Telluride Thermoelectric Materials
TU-Braunschweig Seminar, Braunschweig, Germany, on 2014-Sep-12 (2014).
Authors: Ryu, Byungki
Presentation Type: Seminar

[45] Strategies for high zT
TE-TI WorkShop (sponsored by KERI & KRICT), Hotel Inter-burgo Daegu, Daegu, Korea, on 2014-Jun-11 (2014).
Authors: Ryu, Byungki
Presentation Type: nan

[44] Electronic and magnetic property of TM-doped M-type Sr-hexa-ferrite
KIMS-Seminar, KIMS, Changwon, Korea, on 2014-May-21 (2014).
Authors: Ryu, Byungki
Presentation Type: Seminar

2013

(3 presentations)

[43] Impurity enhanced thermoelectric power of Bi2Te3-based TE materials: Density-functional study
KERI Seminar, KERI, Changwon, Korea, on 2013-Oct-22 (2013).
Authors: Ryu, Byungki
Presentation Type: Seminar

[42] Electronic structure of impurity doped Bi2Te3-based thermoelectric materials
9th KIAS Electronic Structure Calculations Workshop, KIAS, Seoul, Korea, on 2013-Jun-21 (2013).
Authors: Ryu, Byungki; Ahn, Kyunghan; Hwang, SW; Lee, SM; Lee, Kyu-Hyoung
Presentation Type: Invited Talk

[41] Electronic structure of Mn and Fe impurities in Bi-Sb-Te
2013 APS March Meeting, Baltimore, Maryland, US, on 2013-Mar-21 (2013).
Authors: Ryu, Byungki; Ahn, K.; Lee, S. M.; Lee, Kyu Hyoung
Presentation Type: Oral

2012

(3 presentations)

[40] Effect of light illumination and bias stress on the defect properties of oxygen vacancies in amorphous oxide semiconductors: a first principles study
KRISS Computational Metrology Workshop: Special Topics for Materials Innovations - Amorphous Oxide Semiconductors, KRISS, Daejeon, Korea, on 2012-Nov-02 (2012).
Authors: Ryu, Byungki
Presentation Type: Seminar

[39] Atomic and Electronic Structure of Cu Doped Bi-Sb-Te-Se Thermoelectric Materials
2nd International Conference on Electronic Materials and Nanotechnology for Green Environment (ENGE2012), Jeju, Korea, on 2012-Sep-16 (2012).
Authors: Ryu, Byungki; Ahn, Kyunghan; HWANG, Sung Woo; Lee, Kyu Hyung
Presentation Type: Poster

[38] Atomic and electronic structure of O-vacancy defects in amorphous In-Ga-Zn-O semiconductors
The 30th International Conference on the Physics of Semiconductors, Zurich, Switzerland, on 2012-Jul-29 (2012).
Authors: Noh, Hyeon-Kyun; Ryu, Byungki; Lee, Woo-Jin; Chang, Kee Joo
Presentation Type: nan

2011

(4 presentations)

[37] Origin of Device Instability in Amorphous Indium-gallium-zinc Oxide Thin Film Transistors
2011 MRS Spring, Moscone West and San Francisco Marriott, San Francisco, California, USA, on 2011-Apr-25 (2011).
Authors: Noh, Hyeon-Kyun; Ryu, Byungki; Choi, Eun-Ae; Chang, Kee Joo
Presentation Type: nan

[36] Electronic Structure of O-vacancy in High-κ Dielectrics and Oxide Semiconductors
2011 MRS Spring, Moscone West and San Francisco Marriott, San Francisco, California, USA, on 2011-Apr-25 (2011).
Authors: Chang, Kee Joo; Ryu, Byungki; Noh, Hyeon-Kyun; Bang, Junhyeok; Choi, Eun-Ae
Presentation Type: nan

[35] Stability of donor-pair defects in Si1-xGex alloy nanowires
2011 APS March Meeting, Dallas, Texas, US, on 2011-Mar-21 (2011).
Authors: Park, Ji-Sang; Ryu, Byungki; Chang, Kee Joo
Presentation Type: nan

[34] Atomic and electronic structure of O-vacancy defects at Si/HfO2 interface: Density-functional calculations
4th BK21 Young Physicists Workshop, Seoul National University, Seoul, Korea, on 2011-Jan-20 (2011).
Authors: Ryu, Byungki
Presentation Type: nan

2010

(12 presentations)

[33] 반도체/절연체 계면 및 투명 비정질 산화물 반도체의 원자 및 전자구조에 대한 제일원리 연구
KAIST 물리 학위논문식사, KAIST, Daejeon, Korea, on 2010-Nov-23 (2010).
Authors: Ryu, Byungki
Presentation Type: nan

[32] Diffusion and segregation of B dopants at Si/SiO2 interface
The 13th Asian Workshop on First-Principles Electronic Structure Calculations, POSTECH, Pohang, Korea, on 2010-Nov-01 (2010).
Authors: Oh, Young-Jun; Hwang, Jin-Heui; Noh, Hyeon-Kyun; Bang, Junhyeok; Ryu, Byungki; Chang, Kee Joo
Presentation Type: Poster

[31] The atomic and electronic structure of O-vacancy in amorphous In-Ga-Zn-O semiconductors
The 13th Asian Workshop on First-Principles Electronic Structure Calculations, POSTECH, Pohang, Korea, on 2010-Nov-01 (2010).
Authors: Ryu, Byungki; Noh, Hyeon-Kyun; Choi, Eun-Ae; Chang, Kee Joo
Presentation Type: Poster

[30] The role of O-vacancy in Negative Bias Illumination Stress Instability in amorphous In-Ga-Zn-O TFTs
KPS 2010 Fall, Pyeongchang, Korea, on 2010-Oct-01 (2010).
Authors: Ryu, Byungki; Noh, Hyeon-Kyun; Choi, Eun-Ae; Chang, Kee Joo
Presentation Type: Oral

[29] Ab initio study of boron segregation and deactivation at Si/SiO2 interface
International Union of Materials Research Societies (IUMRS)- International Conference on Electronic Materials 2010, KINTEX, Ilsan, Korea, on 2010-Aug-22 (2010).
Authors: Oh, Young Jun; Hwang, Jin-Heui; Noh, Hyeon-Kyun; Bang, Junhyeok; Ryu, Byungki; Chang, Kee Joo
Presentation Type: nan

[28] Electronic structure of O-vacancy in amorphous zinc tin oxide
The 30th International Conference on the Physics of Semiconductors (ICPS-30), COEX, Seoul, Korea, on 2010-Jul-25 (2010).
Authors: Ryu, Byungki; Chang, Kee Joo
Presentation Type: Oral

[27] The electronic structure of oxygen vacancy in amorphous HfSiO4
The 30th International Conference on the Physics of Semiconductors (ICPS-30), COEX, Seoul, Korea, on 2010-Jul-25 (2010).
Authors: Noh, Hyeon-Kyun; Ryu, Byungki; Bang, Junhyeok; Chang, Kee Joo; Choi, Eun-Ae
Presentation Type: nan

[26] Hole Gas Induced by defects in Ge/Si Core-Shell Nanowires
The 30th International Conference on the Physics of Semiconductors (ICPS-30), COEX, Seoul, Korea, on 2010-Jul-25 (2010).
Authors: Park, Ji-Sang; Ryu, Byungki; Moon, Chang-Youn; Chang, Kee Joo
Presentation Type: nan

[25] Electronic Structure and Defects in Oxide Semiconductors and Insulators
International Conference on Core Research and Engineering Science of Advanced Materials, Osaka, Japan, on 2010-May-30 (2010).
Authors: Ryu, Byungki; Choi, Eun-Ae; Noh, Hyeon-Kyun; Bang, Junhyeok; Lee, Woo-Jin; Chang, Kee Joo
Presentation Type: Poster

[24] Atomic and Electronic Structure of Amorphous Zinc Tin Oxide
International Conference on Core Research and Engineering Science of Advanced Materials, Osaka, Japan, on 2010-May-30 (2010).
Authors: Ryu, Byungki; Chang, Kee Joo
Presentation Type: Poster

[23] Hole Carriers Induced by Defects in Ge/Si Core-Shell Nanowires
International Conference on Core Research and Engineering Science of Advanced Materials, Osaka, Japan, on 2010-May-30 (2010).
Authors: Park, Ji-Sang; Ryu, Byungki; Moon, Chang-Youn; Chang, Kee Joo
Presentation Type: nan

[22] The electronic structure of O-vacancy at the interface between Si and HfO2
2010 APS March meeting, Portand, US, on 2010-Mar-15 (2010).
Authors: Ryu, Byungki; Chang, Kee Joo
Presentation Type: Oral

2009

(10 presentations)

[21] The electronic structure of O-vacancy at the interface between ZnO and amorphous HfO2
The 12th Asian Workshop on First-Principles Electronic Structure Calculations, Beijing, China, on 2009-Oct-26 (2009).
Authors: Ryu, Byungki; Chang, Kee Joo
Presentation Type: Poster

[20] The electronic structure of lithium silicides
The 12th Asian Workshop on Fist-Principles Electronic Structure Calculations, Beijing, China, on 2009-Oct-26 (2009).
Authors: Oh, Young Jun; Ryu, Byungki; Chang, Kee Joo
Presentation Type: Poster

[19] Electronic structure calculations of O-vacancy in oxide semiconductors and insulators
The 12th Asian Workshop on Fist-Principles Electronic Structure Calculations, Beijing, China, on 2009-Oct-26 (2009).
Authors: Choi, Eun-Ae; Ryu, Byungki; Noh, Hyeon-Kyun; Bang, Junhyeok; Lee, Woo-Jin; Chang, Kee Joo
Presentation Type: nan

[18] The electronic structure of oxygen-vacancy in ZnO/HfO2 interface structures
KPS 2009 Fall, Changwon, Korea, on 2009-Oct-21 (2009).
Authors: Ryu, Byungki; Chang, Kee Joo
Presentation Type: Poster

[17] The electronic properties of the interface between ZnO and amorphous HfO2
The 25th International Conference on Defects in Semiconductors (ICDS-25), St. Peterburg, Russia, on 2009-Jul-20 (2009).
Authors: Ryu, Byungki; Chang, Kee Joo
Presentation Type: Poster

[16] Electronic structure of oxygen-vacancy in crystalline InGaO3(ZnO)m
The 25th International Conference on Defects in Semiconductors (ICDS-25), St. Peterburg, Russia, on 2009-Jul-20 (2009).
Authors: Lee, Woo-Jin; Ryu, Byungki; Chang, Kee Joo
Presentation Type: Poster

[15] Dopant and deactivation of dopant levels in silicon nanowires
Cecam: Dopants and impurities in Semiconducting Nanowires, CeCAM-HQ-EPFL, Luasanne, Switzerland, on 2009-Jul-06 (2009).
Authors: Chang, Kee Joo; Ryu, Byungki; Lee, Woo-Jin; Moon, Chang-Youn
Presentation Type: nan

[14] The electronic structure of oxygen-vacancy in Si-HfO2 interface structure
The 5th KIAS Electronic Structure Calculation Workshop, KIAS, Seoul, Korea, on 2009-Jun-18 (2009).
Authors: Ryu, Byungki; Chang, Kee Joo
Presentation Type: Poster

[13] The electronic structure of oxygen-vacancy in Si(001)/HfO2 interface structures
KPS 2009 Spring, Daejeon, Korea, on 2009-Apr-23 (2009).
Authors: Ryu, Byungki; Chang, Kee Joo
Presentation Type: Oral

[12] Donor-pair defects and doping efficiency in silicon nanowires
2009 APS March Meeting, Pittsburgh, Pennsylvania, US, on 2009-Mar-17 (2009).
Authors: Ryu, Byungki; Moon, Chang-Youn; Lee, Woo-Jin; Chang, Kee Joo
Presentation Type: Oral

2008

(3 presentations)

[11] Atomic and Electronic Structure of Amorphous HfSiO4
The 11th Asian Workshop on First-Principles Electronic Structure Calculations, Kaohsiung, Taiwan, on 2008-Nov-03 (2008).
Authors: Noh, Hyeon-Kyun; Ryu, Byungki; Chang, Kee Joo
Presentation Type: nan

[10] Electronic structure of single crystalline InGa3(ZnO)m
The 14th International Symposium on the Physics of Semiconductors and Applications (ISPSA), Jeju, Korea, on 2008-Aug-26 (2008).
Authors: Lee, Woo-Jin; Choi, Eun-Ae; Bang, Junhyeok; Ryu, Byungki; Chang, Kee Joo
Presentation Type: nan

[9] Effects of Atomic-Scale Defects on the Electronic Structure of the Dirac Fermions in Graphene
KPS 2008 Spring, Daejeon, Korea, on 2008-Apr-17 (2008).
Authors: Ryu, Byungki; Kang, Joongoo; Bang, Junhyeok; Chang, Kee Joo
Presentation Type: Oral

2007

(3 presentations)

[8] Electron quantum Tunneling through Ultrathin HfO2 Layers
KPS 2006 Fall, Jeju, Korea, on 2007-Oct-18 (2007).
Authors: Ryu, Byungki; Kang, Joongoo; Kim, Yong-Hoon; Chang, Kee Joo
Presentation Type: Oral

[7] Structure, stability, and aggregation of carbon-vacancies in carbon nanotubes
The 4th Conference of the Asian Consortium on Computational Materials Science (ACCMS), KIST, Seoul, Korea, on 2007-Sep-13 (2007).
Authors: Lee, Tae Kyung; Ryu, Byungki; Lee, In-Ho; Chang, Kee Joo
Presentation Type: nan

[6] Molecular dynamics simulations of the diffusion process of carbon vacancies in carbon nanotubes
The 24th International Conference on Defects in Semiconductors (ICDS-24), Alburquerque, New-Mexico, USA, on 2007-Jul-22 (2007).
Authors: Lee, Tae Kyung; Ryu, Byungki; Lee, In-Ho; Chang, Kee Joo
Presentation Type: nan

2006

(4 presentations)

[5] Chemical bonding and electronic structure of AlO2 nanotube bundles
The 9th Asian Workshop on First-Principles Electronic Structure Calculations, KIAS, Seoul, Korea, on 2006-Nov-06 (2006).
Authors: Ryu, Byungki; Kang, Yongju; Chang, Kee Joo
Presentation Type: Poster

[4] First-principles study of the electronic structure of aluminate nanotube and bundles
International Conference on Nanoscience and Technology, Basal, Switzerland, on 2006-Jul-30 (2006).
Authors: Chang, Kee Joo; Ryu, Byungki; Kang, Yong-Ju
Presentation Type: Oral

[3] Electronic structure and stability of aluminate nanotube bundles
7th International Conference on the Science and Application of Nanotubes, Japan, on 2006-Jun-18 (2006).
Authors: Ryu, Byungki; Kang, Yong-Ju; Chang, Kee Joo
Presentation Type: Poster

[2] The electronic structure of aluminate nanotube bundles
KPS 2006 Spring, Phoenix Park, Pyeongchang, Korea, on 2006-Apr-20 (2006).
Authors: Ryu, Byungki; Kang, Yong-Ju; Chang, Kee Joo
Presentation Type: Oral