Recently, organic–inorganic hybrid perovskites have received exponentially increasing attention for use as light-absorbing materials in new-generation solar cells. Remarkable certified power conversion efficiencies of over 23% have been achieved. Halide perovskites have been actively researched due to their noticeable advantages including bandgap tunability, long charge diffusion length, magnetic, and dielectric polarization properties. The applications have not been limited to photovoltaic applications, but also extended to various devices such as light-emitting diodes and resistive random switching memories.

In our laboratory, we focus on improving the performance as well as the stability of perovskite solar cells based on the material engineering of perovskite it self and oxide charge transport layers. we also actively study resistive switching behaivors of halide perovskite through developing new material and understanding switching mechanisms.

[Selected presentation 1][Selected presentation 2]

우리 연구실에서는 고효율/고안정성을 갖는 페로브스카이트 태양전지 제작을 위한 페로브스카이트 소재연구와 무기계 전하수송층에 대해 연구합니다. 이를 위해 소재의 미세구조, 국부적 특성분석을 통한 메커니즘 이해와 합성 프로세스를 개발합니다. 또한 페로브스카이트 신조성군 개발 및 스위칭 메커니즘 연구를 통해 Re-RAM 소자로서의 가능성을 연구합니다.

Hydrogen production via Electrochemical(EC), photoelectrochemical(PEC) water splitting has received much attention as a clean and sustainable method. In addition, the Oxygen Evolution Reaction (OER), which determines the efficiency of the hydrogen production, is receiving much attention as well. In order to achieve commercial hydrogen production efficiency, various researches are being carried out such as bandgap tuning of semiconductors, surface area enlargement, heterojunction, exposing catalytic active site and field enhancement. With interest in increasing hydrogen energy, interest in clean hydrogen production research is also increasing.

In our laboratory, various EC and PEC materials such as metal oxide and sulfide are synthesized by atomic layer deposition (ALD), chemical vapor deposition (CVD), hydrothermal method and electrodeposition. Heterojunction of Ⅳ, Ⅲ-Ⅴ semiconductor with metal oxide and sulfide is also studied. Surface protection with ALD metal oxide and sulfide for vulnerable materials in harsh electrolyte conditions is one of focused issue.

[Selected paper]

우리 연구실에서는 전기화학적, 광전기화학적 물 분해를 통한 수소와 산소 발생 반응에 대해 연구합니다. 실리콘 - 금속 산화물 - 금속 황화물 - 금속 질화물 등 다양한 반도체 재료를 통한 광전기 화학에 대해 연구합니다. 또한 탄소계열, 금속 촉매를 통한 전기화학적 물 분해에 대해 연구합니다. 원자층 증착법 (ALD), 수열 합성, 전착 등 다양한 합성 방법을 통해 재료를 합성 및 분석합니다.

With the advancement of energy storage systems, lithium-ion batteries (LIBs) have played a central role in portable electric devices and automobiles as well as, stationary energy storage systems. One-dimensional nanomaterials, notably, nanorods, nanowires, and nanotubes (NTs), have received significant attention as advanced functional materials along with their interesting electrical, optical, and electrochemical properties. In lithium-ion batteries (LIBs), nanostructured materials used as electrodes provide new avenues to improve electrochemical performance. The high surface-to-volume ratio, surface activity, short diffusion length, and efficient charge transport of 1D nanomaterials provide a potential engineering solution for high energy density with improved cyclability, as well as a high rate of charging and discharging.

In our laboratory, various nanostructured electrodes are synthesized by atomic layer deposition (ALD) and template-assisted method, and hydrothermal method. In particular, nanotubular stuructured electrodes with various wall thicknesses are fabricated. Electrochemical analysis of these electrodes are carried out as well.

우리 연구실에서는 템플레이트 방법과 원자층 증착법을 이용하여 1차원 나노튜브를 포함한 다양한 나노구조물을 합성하고, 분석하며 이를 리튬이온 이차전지의 전극으로 활용하는 것에 대해 연구합니다. 전이금속 산화물, 황하물, 질화물 등을 이용한 이종접합 나노튜브를 합성하며, 합성된 전극의 전기화학적 성능평가 및 분석, 최적화에 대해 연구합니다.

Biomimetic materials approach in tissue engineering is becoming rapidly growing as a promising field in various kind of application including bone tissue engineering. To overcome critically bone defects, developing materials properties or fabricating biomimetic scaffolds may provide a novel alternatives choice for tissue formation and cell differentiation. Also, osteoinductive and organic-inorganic materials have recently been researched to induced the osterogenic mechanism and enhance the mineralization of bone. These include synthesis to achieve similar composition or properties of extra cellular matrix. In additionally, scaffold structure with a micro architecture design similar to native bone tissue also important for bone tissue regeneration therefore various methods for fabricate 3D porous structure have been continuously developed.

In our group, we focusing on synthetic biomimetic materials for bone tissue engineering application hence the organic and inorganic materials were combined and introduced to improve as a bone application in both mineralization and itself properties.

우리 연구실에서는 골 조직 자연모사를 위한 초기 뼈 생성 원리 분석 및 응용 연구를 위해 생체재료를 합성 및 특성에 대해 연구합니다. 침전법, sol-gel법, 수열합성법 등을 통해 Hydroxyapatite, Calcium carbonate 등의 뼈 구성 성분 중 무기물질을 합성 하고, 쥐 꼬리에서 콜라겐을 추출해 뼈 생성 및 성장의 최적화에 대해 연구합니다.

The EML is financially supported by the Ministry of Science, ICT & Future Planning (MSIP) of Korea through the National Research Foundation of Korea (NRF)

(1) 기초연구실 사업 (Basic Research Laboratory Program) (2017 - )

(2) 미래소재 디스커버리 사업 (Future Materials Discovery Program) (2016 - )

(3) 미공군 과학연구실 공동연구지원사업 (Korea - US Air Force Laboratory Program) (2018 - )

(4) 자연모사혁신기술개발사업 (Innovative Biomimetic Technology Project) (2018 - )

(5) 중견연구자 지원사업 (Basic Research Program in Science and Engineering Fields) (2019 - )

(6) 미래도전기술개발사업 (ADD Research Project) (2019 -)