Publications - Article, Thesis & Data

2025

(3 publications)

[95] Wiedemann–Franz law and thermoelectric inequalities: Effective <i>ZT</i> and single-leg efficiency overestimation
Journal of Applied Physics 137, 115001 (2025).
Authors: Ryu, Byungki; Oh, Seunghyun; Demeke, Wabi; Chung, Jaywan; Park, Jongho; Kumari, Nirma; Wani, Aadil Fayaz; Ryu, Seunghwa; Park, SuDong
https://doi.org/10.1063/5.0247466

[94] Instability Mechanism in Thermoelectric Mg2(Si,Sn) and the Role of Mg Diffusion at Room Temperature
Small Science 5, 2300298 (2025).
Authors: Duparchy, Amandine; Deshpande, Radhika; Sankhla, Aryan; Ghosh, Sanyukta; Camut, Julia; Park, Sungjin; Park, SuDong; Ryu, Byungki; Mueller, Eckhard; de Boor, Johannes
https://doi.org/10.1002/smsc.202300298

[93] Thermoelectric algebra made simple for thermoelectric generator module performance prediction under constant Seebeck coefficient approximation
Journal of Applied Physics 137, 55001 (2025).
Authors: Ryu, Byungki; Chung, Jaywan; Park, SuDong
https://doi.org/10.1063/5.0242991

2024

(5 publications)

[92] Enhanced strength of Cu-Ni-Si alloy via heterogeneous nucleation at grain boundaries during homogenization
Materials Characterization 215, 114198 (2024).
Authors: Han, Seung Zeon; Jeong, Il-Seok; Ryu, Byungki; Lee, Sang Jin; Ahn, Jee Hyuk; Choi, Eun-Ae
https://doi.org/10.1016/j.matchar.2024.114198

[91] High-Performance Thermoelectric Devices Made Faster: Interface Design from First Principles Calculations
Advanced Physics Research 3, 2300077 (2024).
Authors: Ayachi, Sahar; Park, Sungjin; Ryu, Byungki; Park, SuDong; Mueller, Eckhard; de Boor, Johannes
https://doi.org/10.1002/apxr.202300077

[90] Simultaneous enhancement of strength and ductility in Al-Zn-Cu casting alloy with trace Mg addition designed by first principle calculation
Materials & Design 244, 113140 (2024).
Authors: Han, Seung Zeon; Ryu, Byungki; Jeong, Il-Seok; Hwan Lim, Sung; Choi, Eun-Ae
https://doi.org/10.1016/j.matdes.2024.113140

[89] Increasing ductility beyond post-uniform deformation through Zn lamellae deformation in Al at room temperature
Heliyon 10, e34984 (2024).
Authors: Han, Seung Zeon; Ryu, Byungki; Jeong, Il-Seok; Lim, Sung Hwan; Choi, Eun-Ae
https://doi.org/10.1016/j.heliyon.2024.e34984

[88] Machine learning-based optimization of segmented thermoelectric power generators using temperature-dependent performance properties
Applied Energy 355, 122216 (2024).
Authors: Demeke, Wabi; Ryu, Byungki; Ryu, Seunghwa
https://doi.org/10.1016/j.apenergy.2023.122216

2023

(7 publications)

[87] Design of aluminum plate phononic crystals with wide bandgaps via free-form shape optimization using deep neural networks
Extreme Mechanics Letters 65, 102098 (2023).
Authors: Demeke, Wabi; Jung, Jiyoung; Song, Hyunggwi; Ryu, Byungki; Jeon, Wonju; Ryu, Seunghwa
https://doi.org/10.1016/j.eml.2023.102098

[86] Towards energy filtering in Mg2X-based composites: Investigating local carrier concentration and band alignment via SEM/EDX and transient Seebeck microprobe analysis
Materials Today Physics 38, 101244 (2023).
Authors: Ghosh, Sanyukta; Naithani, Harshita; Ryu, Byungki; Oppitz, Gregor; Müller, Eckhard; De Boor, Johannes
https://doi.org/10.1016/j.mtphys.2023.101244

[85] Formation energies and charge transition levels for extrinsic and intrinisc defects in Mg2Si and Mg2Sn, calculated within hybrid-density functional theory
Type: dataset (2023).
Authors: Ryu, Byungki; Park, Sungjin
https://doi.org/10.6084/m9.figshare.22237609.v1

[84] Best thermoelectric efficiency of ever-explored materials
iScience 26, 106494 (2023).
Authors: Ryu, Byungki; Chung, Jaywan; Kumagai, Masaya; Mato, Tomoya; Ando, Yuki; Gunji, Sakiko; Tanaka, Atsumi; Yana, Dewi; Fujimoto, Masayuki; Imai, Yoji; Katsura, Yukari; Park, SuDong
https://doi.org/10.1016/j.isci.2023.106494

[83] Data for "Best Thermoelectric Efficiency of Ever-Explored Materials" by Ryu et al., using Starrydata2
Type: dataset (2023).
Authors: Ryu, Byungki; Ryu, Byungki; Chung, Jaywan; Kumagai, Masaya; Katsura, Yukari
https://doi.org/10.17632/R9BHPV6VX9.1

[82] Qualification of Fe0.95Co0.05Si2 as a reference material for high temperature measurement of the thermoelectric power factor
Measurement 207, 112359 (2023).
Authors: Ziolkowski, Pawel; Edler, Frank; Stiewe, Christian; Haupt, Sebastian; Huang, Kai; Ryu, Byungki; Park, SuDong; Dasgupta, Titas; Sahu, Prashant; Taubmann, Rebekka; Müller, Eckhard
https://doi.org/10.1016/j.measurement.2022.112359

[81] Facile phase transition to β- from α-SnSe by uniaxial strain
Current Applied Physics 45, 45-52 (2023).
Authors: Cha, Sun-Kyung; Im, Seongil; Ryu, Byungki; Kim, Yong-Sung
https://doi.org/10.1016/j.cap.2022.10.011

2022

(8 publications)

[80] Highly Conductive p-Type Transparent Conducting Electrode with Sulfur-Doped Copper Iodide
Chemistry of Materials 34, 10517-10527 (2022).
Authors: Ahn, Kyunghan; Kim, Ga Hye; Kim, Se-Jun; Kim, Jihyun; Ryu, Gi-Seong; Lee, Paul; Ryu, Byungki; Cho, Jung Young; Kim, Yong-Hoon; Kang, Joohoon; Kim, Hyungjun; Noh, Yong-Young; Kim, Myung-Gil
https://doi.org/10.1021/acs.chemmater.2c02603

[79] Unique temperature distribution and explicit efficiency formula for one-dimensional thermoelectric generators under constant Seebeck coefficients
Nonlinear Analysis: Real World Applications 68, 103649 (2022).
Authors: Chung, Jaywan; Ryu, Byungki; Seo, Hyowon
https://doi.org/10.1016/j.nonrwa.2022.103649

[78] Neural network-assisted optimization of segmented thermoelectric power generators using active learning based on a genetic optimization algorithm
Energy Reports 8, 6633-6644 (2022).
Authors: Demeke, Wabi; Kim, Yongtae; Jung, Jiyoung; Chung, Jaywan; Ryu, Byungki; Ryu, Seunghwa
https://doi.org/10.1016/j.egyr.2022.04.065

[77] Understanding the dopability of p-type Mg2(Si,Sn) by relating hybrid-density functional calculation results to experimental data
Journal of Physics: Energy 4, 35001 (2022).
Authors: Kamila, Hasbuna; Ryu, Byungki; Ayachi, Sahar; Sankhla, Aryan; Mueller, Eckhard; de Boor, Johannes
https://doi.org/10.1088/2515-7655/ac689d

[76] Anomalous Optoelectric Properties of an Ultrathin Ruthenium Film with a Surface Oxide Layer for Flexible Transparent Conducting Electrodes
Advanced Functional Materials 32, 2109330 (2022).
Authors: Oh, Jae Myoung; Nasir, Mohammad; Ryu, Byungki; Yun, Hyung Joong; Choi, Chel-Jong; Bae, Jong-Seong; Park, Hee Jung
https://doi.org/10.1002/adfm.202109330

[75] International Round Robin Test of Thermoelectric Generator Modules
Materials 15, 1627 (2022).
Authors: Ziolkowski, Pawel; Blaschkewitz, Przemyslaw; Ryu, Byungki; Park, SuDong; Müller, Eckhard
https://doi.org/10.3390/ma15051627

[74] Off-Centered Pb Interstitials in PbTe
Materials 15, 1272 (2022).
Authors: Park, Sungjin; Ryu, Byungki; Park, SuDong
https://doi.org/10.3390/ma15041272

[73] Effect of microstructure on thermoelectric conversion efficiency in metastable δ-phase AgSbTe2
Acta Materialia 222, 117443 (2022).
Authors: Lee, Jae Ki; Ryu, Byungki; Park, Sungjin; Son, Ji Hee; Park, Jongho; Jang, Jeongin; Oh, Min-Wook; Park, SuDong
https://doi.org/10.1016/j.actamat.2021.117443

2021

(10 publications)

[72] Structural Analysis, Phase Stability, Electronic Band Structures, and Electric Transport Types of (Bi2)m(Bi2Te3)n by Density Functional Theory Calculations
Applied Sciences 11, 11341 (2021).
Authors: Park, Sungjin; Ryu, Byungki; Park, SuDong
https://doi.org/10.3390/app112311341

[71] Overcoming Asymmetric Contact Resistances in Al-Contacted Mg2(Si,Sn) Thermoelectric Legs
Materials 14, 6774 (2021).
Authors: Camut, Julia; Ayachi, Sahar; Castillo-Hernández, Gustavo; Park, Sungjin; Ryu, Byungki; Park, Sudong; Frank, Adina; Stiewe, Christian; Müller, Eckhard; de Boor, Johannes
https://doi.org/10.3390/ma14226774

[70] Regulating Te Vacancies through Dopant Balancing via Excess Ag Enables Rebounding Power Factor and High Thermoelectric Performance in p-Type PbTe
Advanced Science 8, 2100895 (2021).
Authors: Jang, Hanhwi; Park, Jong Ho; Lee, Ho Seong; Ryu, Byungki; Park, Su-Dong; Ju, Hyeon-Ah; Yang, Sang-Hyeok; Kim, Young-Min; Nam, Woo Hyun; Wang, Heng; Male, James; Snyder, Gerald Jeffrey; Kim, Minjoon; Jung, Yeon Sik; Oh, Min-Wook
https://doi.org/10.1002/advs.202100895

[69] Thermoelectric degrees of freedom determining thermoelectric efficiency
iScience 24, 102934 (2021).
Authors: Ryu, Byungki; Chung, Jaywan; Park, SuDong
https://doi.org/10.1016/j.isci.2021.102934

[68] Entropy stabilized off-stoichiometric cubic γ-Cu1−xIx phase containing high-density Cu vacancies
AIP Advances 11, 95018 (2021).
Authors: Ahn, Kyunghan; Kim, Myung-Gil; Park, Sungjin; Ryu, Byungki
https://doi.org/10.1063/5.0060622

[67] Corrigendum to “On the relevance of point defects for the selection of contacting electrodes: Ag as an example for Mg2(Si,Sn)-based thermoelectric generators” [Mater. Today Phys. 16 (2021) 100309]
Materials Today Physics 20, 100421 (2021).
Authors: Ayachi, Sahar; Deshpande, Radhika; Ponnusamy, Prasanna; Park, Sungjin; Chung, Jaywan; Park, SuDong; Ryu, Byungki; Müller, Eckhard; de Boor, Johannes
https://doi.org/10.1016/j.mtphys.2021.100421

[66] Micromechanics-based theoretical prediction for thermoelectric properties of anisotropic composites and porous media
International Journal of Thermal Sciences 165, 106918 (2021).
Authors: Jung, Jiyoung; Demeke, Wabi; Lee, Sangryun; Chung, Jaywan; Ryu, Byungki; Ryu, Seunghwa
https://doi.org/10.1016/j.ijthermalsci.2021.106918

[65] Native point defects and low p-doping efficiency in Mg2(Si,Sn) solid solutions: A hybrid-density functional study
Journal of Alloys and Compounds 853, 157145 (2021).
Authors: Ryu, Byungki; Choi, Eun-Ae; Park, Sungjin; Chung, Jaywan; de Boor, Johannes; Ziolkowski, Pawel; Müller, Eckhard; Park, SuDong
https://doi.org/10.1016/j.jallcom.2020.157145

[64] Effect of defect interactions with interstitial Ag in the lattice of BixSb2−xTe3 alloys and their thermoelectric properties
Applied Physics Letters 118, 52102 (2021).
Authors: Lee, Jae Ki; Park, Sungjin; Ryu, Byungki; Lee, Ho Seong; Park, Jongho; Park, SuDong
https://doi.org/10.1063/5.0040808

[63] On the relevance of point defects for the selection of contacting electrodes: Ag as an example for Mg2(Si,Sn)-based thermoelectric generators
Materials Today Physics 16, 100309 (2021).
Authors: Ayachi, Sahar; Deshpande, Radhika; Ponnusamy, Prasanna; Park, Sungjin; Chung, Jaywan; Park, Sudong; Ryu, Byungki; Müller, Eckhard; de Boor, Johannes
https://doi.org/10.1016/j.mtphys.2020.100309

2020

(3 publications)

[62] Dimension reduction of thermoelectric properties using barycentric polynomial interpolation at Chebyshev nodes
Scientific Reports 10, 13456 (2020).
Authors: Chung, Jaywan; Ryu, Byungki; Park, SuDong
https://doi.org/10.1038/s41598-020-70320-7

[61] Thermoelectric Properties of Off-Stoichiometric Bi2Te2Se Compounds
Journal of Electronic Materials 49, 5308 (2020).
Authors: Kim, Bong-Seo; Lee, Goeun; Lim, Hye-Jin; Jang, Jeongin; Lee, Ji Eun; Min, Bok-Ki; Joo, Sung-Jae; Park, Sungjin; Ryu, Byungki; Lee, Ho Seong
https://doi.org/10.1007/s11664-020-08258-9

[60] Counterintuitive example on relation between ZT and thermoelectric efficiency
Applied Physics Letters 116, 193903 (2020).
Authors: Ryu, Byungki; Chung, Jaywan; Choi, Eun-Ae; Ziolkowski, Pawel; Müller, Eckhard; Park, SuDong
https://doi.org/10.1063/5.0003749

2019

(5 publications)

[59] Investigation of effective thermoelectric properties of composite with interfacial resistance using micromechanics-based homogenisation
International Journal of Heat and Mass Transfer 144, 118620 (2019).
Authors: Jung, Jiyoung; Lee, Sangryun; Ryu, Byungki; Ryu, Seunghwa
https://doi.org/10.1016/j.ijheatmasstransfer.2019.118620

[58] Hybrid-Functional and Quasi-Particle Calculations of Band Structures of Mg2Si, Mg2Ge, and Mg2Sn
Journal of the Korean Physical Society 75, 144-152 (2019).
Authors: Ryu, Byungki; Park, Sungjin; Choi, Eun-Ae; de Boor, Johannes; Ziolkowski, Pawel; Chung, Jaywan; Park, Su Dong
https://doi.org/10.3938/jkps.75.144

[57] Fine tuning of Fermi level by charged impurity-defect cluster formation and thermoelectric properties in n-type PbTe-based compounds
Journal of Materials Chemistry A 7, 16488-16500 (2019).
Authors: Lee, Min Ho; Park, Sungjin; Lee, Jae Ki; Chung, Jaywan; Ryu, Byungki; Park, Su-Dong; Rhyee, Jong-Soo
https://doi.org/10.1039/C9TA04220B

[56] Author Correction: A micromechanics-based analytical solution for the effective thermal conductivity of composites with orthotropic matrices and interfacial thermal resistance
Scientific Reports 9, nan (2019).
Authors: Lee, Sangryun; Lee, Jinyeop; Ryu, Byungki; Ryu, Seunghwa
https://doi.org/10.1038/s41598-019-43986-x

[55] Highly anisotropic thermoelectric transport properties responsible for enhanced thermoelectric performance in the hot-deformed tetradymite Bi2Te2S
Journal of Alloys and Compounds 783, 448-454 (2019).
Authors: Joo, Sung-Jae; Ryu, Byungki; Son, Ji-Hee; Lee, Ji Eun; Min, Bok-Ki; Kim, Bong-Seo
https://doi.org/10.1016/j.jallcom.2018.12.340

2018

(7 publications)

[54] Abnormal Optoelectric Properties of Two-Dimensional Protonic Ruthenium Oxide with a Hexagonal Structure
ACS Applied Materials & Interfaces 10, 22661-22668 (2018).
Authors: Park, Hee Jung; Lee, Kimoon; Kim, Il-Doo; Choi, Seon-Jin; Ryu, Byungki
https://doi.org/10.1021/acsami.8b07533

[53] A micromechanics-based analytical solution for the effective thermal conductivity of composites with orthotropic matrices and interfacial thermal resistance
Scientific Reports 8, 7266 (2018).
Authors: Lee, Sangryun; Lee, Jinyeop; Ryu, Byungki; Ryu, Seunghwa
https://doi.org/10.1038/s41598-018-25379-8

[52] Control of Carrier Concentration by Ag Doping in N-Type Bi2Te3 Based Compounds
Applied Sciences 8, 735 (2018).
Authors: Lee, Jae; Son, Ji; Kim, Yong-Il; Ryu, Byungki; Cho, Byung; Kim, Sookyung; Park, Su-Dong; Oh, Min-Wook
https://doi.org/10.3390/app8050735

[51] Antimony-induced heterogeneous microstructure of Mg 2 Si 0.6 Sn 0.4 thermoelectric materials and their thermoelectric properties
Journal of Alloys and Compounds 739, 129-138 (2018).
Authors: Jang, Jeongin; Ryu, Byungki; Joo, Sung-Jae; Kim, Bong-Seo; Min, Bok-Ki; Lee, Hee-Woong; Park, Su-Dong; Lee, Ho Seong; Lee, Ji Eun
https://doi.org/10.1016/j.jallcom.2017.12.203

[50] Correction: Defect chemistry and enhancement of thermoelectric performance in Ag-doped Sn1+δ−xAgxTe
Journal of Materials Chemistry A 6, 4219-4219 (2018).
Authors: Lee, Min Ho; Byeon, Do-Gyun; Rhyee, Jong-Soo; Ryu, Byungki
https://doi.org/10.1039/C8TA90028K

[49] Enhancing Thermoelectric Performances of Bismuth Antimony Telluride via Synergistic Combination of Multiscale Structuring and Band Alignment by FeTe ₂ Incorporation
ACS Applied Materials & Interfaces 10, 3689-3698 (2018).
Authors: Shin, Weon Ho; Roh, Jong Wook; Ryu, Byungki; Chang, Hye Jung; Kim, Hyun Sik; Lee, Soonil; Seo, Won Seon; Ahn, Kyunghan
https://doi.org/10.1021/acsami.7b18451

[48] Work function of bismuth telluride: First-principles approach
Journal of the Korean Physical Society 72, 122-128 (2018).
Authors: Ryu, Byungki
https://doi.org/10.3938/jkps.72.122

2017

(5 publications)

[47] Thermoelectric power factor of Bi-Sb-Te and Bi-Te-Se alloys and doping strategy: First-principles study
Journal of Alloys and Compounds 727, 1067-1075 (2017).
Authors: Ryu, Byungki; Chung, Jaywan; Choi, Eun-Ae; Kim, Bong-Seo; Park, Su-Dong
https://doi.org/10.1016/j.jallcom.2017.08.166

[46] Quasi-High-Pressure Effects in Transition-Metal-Rich Dichalcogenide, Hf ₃ Te ₂
The Journal of Physical Chemistry C 121, 25541-25546 (2017).
Authors: Yu, Ho Sung; Ryu, Byungki; Park, Soohyung; Park, Jongho; Yi, Yeonjin; Lee, Kyu Hyoung; Lee, Kimoon; Kim, Sung Wng
https://doi.org/10.1021/acs.jpcc.7b06851

[45] GW Calculations Overcoming DFT Band Gap Problem
Physics and High Technology 26, 15-21 (2017).
Authors: Ryu, Byungki; Choi, Eun-Ae
https://doi.org/10.3938/PhiT.26.039

[44] Enhanced thermoelectric properties of AgSbTe 2 obtained by controlling heterophases with Ce doping
Scientific Reports 7, 4496 (2017).
Authors: Lee, Jae Ki; Oh, Min-Wook; Ryu, Byungki; Lee, Ji Eun; Kim, Bong-Seo; Min, Bok-Ki; Joo, Sung-Jae; Lee, Hee-Woong; Park, Su-Dong
https://doi.org/10.1038/s41598-017-04885-1

[43] Defect chemistry and enhancement of thermoelectric performance in Ag-doped Sn _1+δ−x Ag _x Te
Journal of Materials Chemistry A 5, 2235-2242 (2017).
Authors: Lee, Min Ho; Byeon, Do-Gyun; Rhyee, Jong-Soo; Ryu, Byungki
https://doi.org/10.1039/C6TA09941F

2016

(9 publications)

[42] Hybrid-density functional theory study on the band structures of tetradymite-Bi2Te3, Sb2Te3, Bi2Se3, and Sb2Se3 thermoelectric materials
Journal of the Korean Physical Society 69, 1683-1687 (2016).
Authors: Park, Sudong; Ryu, Byungki
https://doi.org/10.3938/jkps.69.1683

[41] Thermoelectric properties of Bi2Te2.7Se0.3 nanocomposites embedded with MgO nanoparticles
Journal of the Korean Physical Society 69, 1314-1320 (2016).
Authors: Joo, Sung-Jae; Son, Ji-Hee; Min, Bok-Ki; Lee, Ji-Eun; Kim, Bong-Seo; Ryu, Byungki; Park, Su-Dong; Lee, Hee-Woong
https://doi.org/10.3938/jkps.69.1314

[40] Computational Simulations of Thermoelectric Transport Properties
Journal of the Korean Ceramic Society 53, 273-281 (2016).
Authors: Ryu, Byungki; Oh, Min-Wook
https://doi.org/10.4191/kcers.2016.53.3.273

[39] Fabrication of Miniature Thermoelectric Generators Using Bulk Materials
Journal of Electronic Materials 45, 3453-3459 (2016).
Authors: Joo, Sung-Jae; Ryu, Byungki; Min, Bok-Ki; Lee, Ji-Eun; Kim, Bong-Seo; Park, Su-Dong; Lee, Hee-Woong
https://doi.org/10.1007/s11664-016-4560-z

[38] Enhanced thermoelectric properties and development of nanotwins in Na-doped Bi0.5Sb1.5Te3 alloy
Electronic Materials Letters 12, 290-295 (2016).
Authors: Kim, Hyun; Lee, Jae Ki; Park, Su-Dong; Ryu, Byungki; Lee, Ji Eun; Kim, Bong-Seo; Min, Bok-Ki; Joo, Sung-Jae; Lee, Hee-Woong; Cho, Young-Rae
https://doi.org/10.1007/s13391-015-5390-5

[37] Importance of crystal chemistry with interstitial site determining thermoelectric transport properties in pavonite homologue Cu–Bi–S compounds
CrystEngComm 18, 1453-1461 (2016).
Authors: Ahn, Jun Yeon; Hwang, Jae-Yeol; Ryu, Byung Ki; Oh, Min-Wook; Lee, Kyu Hyoung; Kim, Sung Wng
https://doi.org/10.1039/C5CE02143J

[36] Effect of La-doping on AgSbTe2 thermoelectric compounds
Journal of the Korean Physical Society 68, 164-169 (2016).
Authors: Min, Bok-Ki; Kim, Bong-Seo; Oh, Min-Wook; Ryu, Byung-Ki; Lee, Ji-Eun; Joo, Sung-Jae; Park, Su-Dong; Lee, Hee-Woong; Lee, Ho-seong
https://doi.org/10.3938/jkps.68.164

[35] Prediction of the band structures of Bi2Te3-related binary and Sb/Se-doped ternary thermoelectric materials
Journal of the Korean Physical Society 68, 115-120 (2016).
Authors: Ryu, Byungki; Kim, Bong-Seo; Lee, Ji Eun; Joo, Sung-Jae; Min, Bok-Ki; Lee, HeeWoong; Park, Sudong; Oh, Min-Wook
https://doi.org/10.3938/jkps.68.115

[34] Enhancement of the thermoelectric figure of merit in n-type Cu0.008Bi2Te2.7Se0.3 by using Nb doping
Journal of the Korean Physical Society 68, 2025-07-11 00:00:00 (2016).
Authors: Lee, Kyu Hyoung; Ryu, Byungki; Park, Hee Jung; Lee, Kimoon; Roh, Jong Wook; Kim, Sang Il; Hwang, Sungwoo; Choi, Soon-Mok; Kim, Jong-Young; Lee, Jeong Hoon; Lim, Jae-Hong; Kim, Sung Wng
https://doi.org/10.3938/jkps.68.7

2015

(4 publications)

[33] Deposition of n-Type Bi2Te3 Thin Films on Polyimide by Using RF Magnetron Co-Sputtering Method
Journal of Nanoscience and Nanotechnology 15, 8299-8304 (2015).
Authors: Joo, Sung-Jae; Kim, Bong Seo; Min, Bok-Ki; Oh, Min Wook; Lee, Ji-Eun; Ryu, Byung Ki; Lee, Hee Woong; Park, Su Dong
https://doi.org/10.1166/jnn.2015.11440

[32] Enhanced thermoelectric performance of n-type Cu0.008Bi2Te2.7Se0.3 by band engineering
Journal of Materials Chemistry C 3, 10604-10609 (2015).
Authors: Lee, Kyu Hyoung; Kim, Sang Il; Mun, Hyeona; Ryu, Byungki; Choi, Soon-Mok; Park, Hee Jung; Hwang, Sungwoo; Kim, Sung Wng
https://doi.org/10.1039/C5TC01731A

[31] Defects responsible for abnormal n-type conductivity in Ag-excess doped PbTe thermoelectrics
Journal of Applied Physics 118, 15705 (2015).
Authors: Ryu, Byungki; Oh, Min-Wook; Lee, Jae Ki; Lee, Ji Eun; Joo, Sung-Jae; Kim, Bong-Seo; Min, Bok-Ki; Lee, Hee-Woong; Park, Su-Dong
https://doi.org/10.1063/1.4923391

[30] Electronic Structures and Seebeck Coefficients of Bi2Te3, Sb2Te3, and (Bi0. 25Sb0. 75)2Te3: A First-Principles Calculation Study
Journal of Nanoelectronics and Optoelectronics 10, 391-396 (2015).
Authors: Oh, M. W.; Ryu, B.; Lee, J. E.; Joo, S. J.; Kim, B. S.; Park, S. D.; Min, B. K.; Lee, H. W.
https://doi.org/10.1166/jno.2015.1756

2014

(5 publications)

[29] Nonlocal Problems Arising in Thermoelectrics
Mathematical Problems in Engineering 2014, 909078 (2014).
Authors: Chung, Jaywan; Ryu, Byungki
https://doi.org/10.1155/2014/909078

[28] Electronic Structure and X-ray Absorption Spectra of Rutile TiO2 Using First-Principles Calculations
Korean Journal of Metals and Materials 52, 1025-1029 (2014).
Authors: Oh, Min-Wook; Kang, Tae-Gu; Ryu, Byungki; Lee, Ji Eun; Joo, Sung-Jae; Kim, Bong-Seo; Min, Dok-Ki; Lee, Hee-Woong; Park, Su-Dong
https://doi.org/10.3365/KJMM.2014.52.12.1025

[27] Origin of High Photoconductive Gain in Fully Transparent Heterojunction Nanocrystalline Oxide Image Sensors and Interconnects
Advanced Materials 26, 7102-7109 (2014).
Authors: Jeon, Sanghun; Song, Ihun; Lee, Sungsik; Ryu, Byungki; Ahn, Seung-Eon; Lee, Eunha; Kim, Young; Nathan, Arokia; Robertson, John; Chung, U-In
https://doi.org/10.1002/adma.201401955

[26] Enhancement of thermoelectric properties of Mg2Si compounds with Bi doping through carrier concentration tuning
Electronic Materials Letters 10, 807-811 (2014).
Authors: Lee, Ji Eun; Cho, Sang-Hum; Oh, Min-Wook; Ryu, Byungki; Joo, Sung-Jae; Kim, Bong-Seo; Min, Bok-Ki; Lee, Hee-Woong; Park, Su-Dong
https://doi.org/10.1007/s13391-014-4148-9

[25] Action-derived molecular dynamics simulations for the migration and coalescence of vacancies in graphene and carbon nanotubes
Journal of Physics: Condensed Matter 26, 115303 (2014).
Authors: Lee, Alex Taekyung; Ryu, Byungki; Lee, In-Ho; Chang, K. J.
https://doi.org/10.1088/0953-8984/26/11/115303

2013

(3 publications)

[24] Cu–Bi–Se-based pavonite homologue: a promising thermoelectric material with low lattice thermal conductivity
Journal of Materials Chemistry A 1, 9768-9774 (2013).
Authors: Cho, Jung Young; Mun, Hyeona; Ryu, Byungki; Kim, Sang Il; Hwang, Sungwoo; Roh, Jong Wook; Yang, Dae Jin; Shin, Weon Ho; Lee, Sang Mock; Choi, Soon-Mok; Kang, Dae Joon; Kim, Sung Wng; Lee, Kyu Hyoung
https://doi.org/10.1039/C3TA11457K

[23] Enhancement of the Thermoelectric Performance of Bi0.4Sb1.6Te3 Alloys by In and Ga Doping
Journal of Electronic Materials 42, 1617-1621 (2013).
Authors: Lee, Kyu-Hyoung; Hwang, Sungwoo; Ryu, Byungki; Ahn, Kyunghan; Roh, Jongwook; Yang, Daejin; Lee, Sang-Mock; Kim, Hyunsik; Kim, Sang-Il
https://doi.org/10.1007/s11664-012-2356-3

[22] Rational design of Nb-based alloys for hydrogen separation: A first principles study
AIP Advances 3, 22102 (2013).
Authors: Ryu, Byungki; Park, Hyeon Cheol; Cho, Eunseog; Kim, Kwanghee; Lee, Jaeho; Liu, Meilin
https://doi.org/10.1063/1.4790627

2012

(2 publications)

[21] Metal Oxide Thin Film Phototransistor for Remote Touch Interactive Displays
Advanced Materials 24, 2631–2636 (2012).
Authors: Ahn, Seung-Eon; Song, Ihun; Jeon, Sanghun; Jeon, Youg Woo; Kim, Young; Kim, Changjung; Ryu, Byungki; Lee, Je-Hun; Nathan, Arokia; Lee, Sungsik; Kim, Gyu Tae; Chung, U-In
https://doi.org/10.1002/adma.201200293

[20] Ab initio study of boron segregation and deactivation at Si/SiO2 interface
Microelectronic Engineering 89, 120-123 (2012).
Authors: Oh, Young Jun; Hwang, Jin-Heui; Noh, Hyeon-Kyun; Bang, Junhyeok; Ryu, Byungki; Chang, K. J.
https://doi.org/10.1016/j.mee.2011.04.036

2011

(7 publications)

[19] Electronic Structure of O‐vacancy in Amorphous Zinc‐Tin Oxides
Type: conferencePaper (2011).
Authors: Ryu, Byungki; Chang, Kee Joo
https://doi.org/10.1063/1.3666284

[18] Hole Gas Induced by Defects in Ge/Si Core‐Shell Nanowires
Type: conferencePaper (2011).
Authors: Park, J.-S.; Ryu, B.; Moon, C.-Y.; Chang, K. J.
https://doi.org/10.1063/1.3666374

[17] The Electronic Structure of Oxygen Vacancy in Amorphous HfSiO4
Type: conferencePaper (2011).
Authors: Noh, Hyeon-Kyun; Ryu, Byungki; Bang, Junhyeok; Chang, Kee Joo; Choi, Eun-Ae
https://doi.org/10.1063/1.3666255

[16] Electronic structure of oxygen-vacancy defects in amorphous In-Ga-Zn-O semiconductors
Physical Review B 84, 115205 (2011).
Authors: Noh, Hyeon-Kyun; Chang, K. J.; Ryu, Byungki; Lee, Woo-Jin
https://doi.org/10.1103/PhysRevB.84.115205

[15] Stability of Donor-Pair Defects in Si1–xGex Alloy Nanowires
The Journal of Physical Chemistry C 115, 10345-10350 (2011).
Authors: Park, Ji-Sang; Ryu, Byungki; Chang, K. J.
https://doi.org/10.1021/jp111886n

[14] Electronic Structure of O-vacancy in High-k Dielectrics and Oxide Semiconductors
Type: conferencePaper (2011).
Authors: Chang, Kee Joo; Ryu, Byungki; Noh, Hyeon-Kyun; Bang, Junhyeok; Choi, Eun-Ae
https://doi.org/10.1557/opl.2011.771

[13] First-principles study of the atomic and electronic structures of semiconductor/insulator interfaces and transparent amorphous oxide semiconductors
KAIST, Ph.D. Thesis (2011).
Authors: Ryu, Byungki

2010

(4 publications)

[12] Defects responsible for the Fermi level pinning in n+ poly-Si/HfO2 gate stacks
Applied Physics Letters 97, 242910 (2010).
Authors: Ryu, Byungki; Chang, K. J.
https://doi.org/10.1063/1.3527929

[11] Effect of O-vacancy on the device instability of amorphous zinc-tin-oxide thin-film-transistors
Type: conferencePaper (2010).
Authors: Ryu, B.; Chang, K.J.
https://doi.org/nan

[10] O-vacancy as the origin of negative bias illumination stress instability in amorphous In–Ga–Zn–O thin film transistors
Applied Physics Letters 97, 22108 (2010).
Authors: Ryu, Byungki; Noh, Hyeon-Kyun; Choi, Eun-Ae; Chang, K. J.
https://doi.org/10.1063/1.3464964

[9] Defects Responsible for the Hole Gas in Ge/Si Core−Shell Nanowires
Nano Letters 10, 116-121 (2010).
Authors: Park, Ji-Sang; Ryu, Byungki; Moon, Chang-Youn; Chang, K. J.
https://doi.org/10.1021/nl9029972

2009

(4 publications)

[8] The electronic properties of the interface structure between ZnO and amorphous HfO2
Physica B: Condensed Matter 404, 4823-4826 (2009).
Authors: Ryu, Byungki; Chang, K. J.
https://doi.org/10.1016/j.physb.2009.08.184

[7] Electronic structure of oxygen vacancy in crystalline InGaO3(ZnO)m
Physica B: Condensed Matter 404, 4794-4796 (2009).
Authors: Lee, W. -J.; Ryu, B.; Chang, K. J.
https://doi.org/10.1016/j.physb.2009.08.178

[6] Local bonding effect on the defect states of oxygen vacancy in amorphous HfSiO4
Applied Physics Letters 95, 82905 (2009).
Authors: Noh, Hyeon-Kyun; Ryu, Byungki; Choi, Eun-Ae; Bang, Junhyeok; Chang, K. J.
https://doi.org/10.1063/1.3216058

[5] First-principles Study of the Electronic Structure of Crystalline InGaO3 (ZnO) 3
Journal of the Korean Physical Society 55, 112–115 (2009).
Authors: Lee, W. J.; Choi, E. A.; Bang, J.; Ryu, B.; Chang, K. J.
https://doi.org/10.3938/jkps.55.112

2008

(2 publications)

[4] Structural and electronic properties of crystalline InGaO3(ZnO)m
Applied Physics Letters 93, 111901 (2008).
Authors: Lee, W.-J.; Choi, E.-A.; Bang, J.; Ryu, B.; Chang, K. J.
https://doi.org/10.1063/1.2980583

[3] Effect of atomic-scale defects on the low-energy electronic structure of graphene: Perturbation theory and local-density-functional calculations
Physical Review B 77, 115453 (2008).
Authors: Kang, Joongoo; Bang, Junhyeok; Ryu, Byungki; Chang, K. J.
https://doi.org/10.1103/PhysRevB.77.115453

2007

(2 publications)

[2] Crystal binding and metal-semiconductor transition in aluminate nanotube bundles
Physical Review B 75, 235402 (2007).
Authors: Ryu, Byungki; Kang, Yong-Ju; Chang, K. J.
https://doi.org/10.1103/PhysRevB.75.235402

[1] First-principles study of the electronic structure of aluminate nanotubes
Journal of Physics: Conference Series 61, 195 (2007).
Authors: Ryu, Byungki; Kang, Yong-Ju; Chang, K. J.
https://doi.org/10.1088/1742-6596/61/1/039