Professor - Deokjae Choi’s CORE Lab | Optoelectronics & Renewable Energy

Deokjae Choi (최덕재)

Senior Research Scientist

Advanced Photovoltaics Research Center,
Sustainable Energy Research Division,
Korea Institute of Science and Technology (KIST)

E-mail: deokjae.choi@kist.re.kr

Address: L4353A, Hwarangno 14-gil 5, Seongbuk-gu, Seoul 02792, Republic of Korea

Education

Sep. 2015 ~ Feb. 2022

M.S. - Ph.D in School of Energy and Chemical Engineering
Ulsan National Institute of Science and Technology (UNIST) Ulsan, South Korea

Mar. 2011 ~ Aug. 2015

B.S. in School of Energy and Chemical Engineering
Ulsan National Institute of Science and Technology (UNIST) Ulsan, South Korea

Professional Experiences

Sep. 2025 ~ Present

Senior Research Scientist in Advanced Photovoltaic Research Center
Korea Instititue of Science and Technology (KIST), Seoul, South Korea

Jan. 2023 ~ Jul. 2025

Postdoctoral Fellow in Department of Chemistry
Northwestern University, Evanston, IL, USA

Mar. 2022 ~ Dec. 2023

Postdoctoral Fellow in School of Energy and Chemical Engineering
Ulsan National Institute of Science and Technology (UNIST) Ulsan, South Korea

Sep. 2018 ~ Mar. 2019

Visiting Scholar in School of Engineering and Applied Science (SEAS) Harvard University, Boston, MA, USA

Honors & Awards

Mar. 2022 ~ Dec. 2023

Sejong Science Fellowship

Ministry of Science and ICT, South Korea

Nov. 2021

Top Excellence Graduate Student Award

School of Energy and Chemical Engineering Ulsan National Institute of Science and Technology (UNIST) Ulsan, South Korea

Selected Publication

Translating insights from progress in photovoltaics to accelerate industrial-scale CO2 electroreduction

D. Choi,† J. Kim,† S. Jaffer, B. Chen, K. Xie, E. H. Sargent*
Nature Energy Submitted [IF: 60.1, JCR: Top 0.3%]

Carboxyl-Functionalized Perovskite Enables ALD Growth of a Compact and Uniform Ion Migration Barrier

D. Choi,† D. Shin,† C. Li,† Y. Liu,† A. S. R. Bati,† D. E. Kachman, Y. Yang, J. Li, Y. J. Lee, M. Li, S. Penukula, D. B. Kim, H. Shin, C.-H. Chen, S. M. Park, C. Liu, A. Maxwell, H. Wan, N. Rolston, E. H. Sargent,* B. Chen*
Joule 2025, 9, 101801 [IF: 38.6, JCR: Top 0.8%]

Link

Wafer-scale Radial Junction Solar Cells with 21.1% Efficiency Using c-Si Microwires

D. Choi,† I. Hwang,† Y. Lee, M. Lee, H.-D. Um,* and K. Seo*
Adv. Funct. Mater. 2022, 32, 2208377 [IF: 18.5, JCR: Top 4.1%]

Link

Silicon Microwire Arrays with Nanoscale Spacing for Radial Junction Crystalline Silicon Solar Cells with a High Efficiency of 20.5%

N. Kim,† D. Choi,† H. Kim, H.-D. Um, and K. Seo*
ACS Nano 2021, 15, 14756 [IF: 15.8, JCR: Top 5.9%]

Link

Field-induced Radial Junction for Dopant-free Crystalline Silicon Microwire Solar Cells with an Efficiency of Over 20%

D. Choi, and K. Seo*
Adv. Energy Mater. 2021, 11, 2003707 [IF: 24.4, JCR: Top 2.6%]

Link

Principal Investigator

Education

M.S. - Ph.D in School of Energy and Chemical Engineering Ulsan National Institute of Science and Technology (UNIST) Ulsan, South Korea

B.S. in School of Energy and Chemical Engineering Ulsan National Institute of Science and Technology (UNIST) Ulsan, South Korea

Professional Experiences

Senior Research Scientist in Advanced Photovoltaic Research Center Korea Instititue of Science and Technology (KIST), Seoul, South Korea

Postdoctoral Fellow in Department of Chemistry Northwestern University, Evanston, IL, USA

Postdoctoral Fellow in School of Energy and Chemical Engineering Ulsan National Institute of Science and Technology (UNIST) Ulsan, South Korea

Visiting Scholar in School of Engineering and Applied Science (SEAS) Harvard University, Boston, MA, USA

Honors & Awards

Sejong Science Fellowship

Top Excellence Graduate Student Award

Selected Publication

Translating insights from progress in photovoltaics to accelerate industrial-scale CO2 electroreduction

Carboxyl-Functionalized Perovskite Enables ALD Growth of a Compact and Uniform Ion Migration Barrier

Wafer-scale Radial Junction Solar Cells with 21.1% Efficiency Using c-Si Microwires

Silicon Microwire Arrays with Nanoscale Spacing for Radial Junction Crystalline Silicon Solar Cells with a High Efficiency of 20.5%

Field-induced Radial Junction for Dopant-free Crystalline Silicon Microwire Solar Cells with an Efficiency of Over 20%

M.S. - Ph.D in School of Energy and Chemical Engineering
Ulsan National Institute of Science and Technology (UNIST) Ulsan, South Korea

B.S. in School of Energy and Chemical Engineering
Ulsan National Institute of Science and Technology (UNIST) Ulsan, South Korea

Senior Research Scientist in Advanced Photovoltaic Research Center
Korea Instititue of Science and Technology (KIST), Seoul, South Korea

Postdoctoral Fellow in Department of Chemistry
Northwestern University, Evanston, IL, USA

Postdoctoral Fellow in School of Energy and Chemical Engineering
Ulsan National Institute of Science and Technology (UNIST) Ulsan, South Korea