• 2024 - Present: Principal Research Scientist, Advanced Energy Materials Research Center, 

Korea Institute of Chemical Technology (KRICT), Daejeon, Republic of Korea

• 2022 - Present: Associate Professor, Advanced Materials and Chemical Engineering  Department, 

Korea National University of Science and Technology (UST), Daejeon, Republic of Korea

• 2017 - 2024: Senior Researcher, Advanced Energy Materials Research Center, 

Korea Institute of Chemical Technology (KRICT), Daejeon, Republic of Korea

• 2015 - 2017: Postdoctoral Researcher, U.S. Naval Research Laboratory (NRL), Washington, DC, USA

• 2008 - 2014: Ph.D. in Applied Physics, Harvard University (Advisor: Prof. Roy Gordon)

• 2004 - 2008: B.S. in Chemical Engineering, summa cum laude, University of Rochester

• Joshua Sraku Adu,† Alice Sheppard,† Raphael E. Agbenyeke, George Kwesi Asare, Behrang H. Hamadani,* David J. Fermin,* and Helen Hejin Park*

“Tuning the Surface Electronic Landscape of Ultrathin (Al,Sn)Ox Electron Extraction Layers in Perovskite Solar Cells”

Small 2412702 (2025). 

• Jin Won Lee,† Joshua Sraku Adu,† Raphael E. Agbenyeke, Alice Sheppard, Jude Laverock, Eunyoung Park, Youngwoong Kim, Soonil Hong, Nam Joong Jeon,* David J. Fermin,* and Helen Hejin Park*

“Ultrathin Oxygen Deficient SnOx Films as Electron Extraction Layers for Perovskite Solar Modules”

J. Mater. Chem. A 13, 4100-4106 (2025). [Inside Cover]

• Eunyoung Choi,† Jin-Won Lee,† Miguel Anaya, Alessandro Mirabelli, Milos Dubajic, Joseph Strzalka, Hongjae Shim, Jihoo Lim, Jan Seidel, Raphael E. Agbenyeke, Chang Gyoun Kim, Nam Joong Jeon, Arman Mahboubi Soufiani,* 

Helen Hejin Park,* and Jae Sung Yun*

“Synergetic Effect of Aluminium Oxide and Organic Halide Salts on Surface Passivation and Stability Enhancement of Perovskite Solar Cells”

Adv. Energy Mater., 2301717 (2023). [Inside Cover]

• Hyunmin Jung,† Geunjin Kim,† Gyeong Sun Jang, Jihoo Lim, Moonyong Kim, Xiaojing Hao, Nam Joong Jeon, 

Jae Sung Yun, Helen Hejin Park,* and Jangwon Seo*

“Transparent Electrodes with Enhanced Transmittance in Long Wavelength Region for Semitransparent Perovskite Solar Cells and Four-Terminal Tandem Applications”

ACS Appl. Mater. Interfaces 13 (26), 30497 (2021).

• Helen Hejin Park, Seulki Song, and Jangwon Seo*

“Perspective: Approaches for Layers above the Absorber in Perovskite Solar Cells for Semitransparent and Tandem Applications”

Mater. Today Energy 21, 100729 (2021).

• Taeyong Eom,† Songhee Kim,† Raphael E. Agbenyeke, Hyunmin Jung, Seon Min Shin, Young Kuk Lee, Chang Gyoun Kim, Taek-Mo Chung, Nam Joong Jeon, Helen Hejin Park,* and Jangwon Seo*

“Copper Oxide Buffer Layers by Pulsed-Chemical Vapor Deposition for Semitransparent Perovskite Solar Cells”

Adv. Mater. Interfaces, 2001482 (2020). [Back Cover]

• Helen Hejin Park, Jincheol Kim, Geunjin Kim, Hyunmin Jung, Songhee Kim, Chan Su Moon, Seon Joo Lee, 

Seong Sik Shin, Xiaojing Hao, Jae Sung Yun, Martin A. Green, Anita W. Y. Ho‑Baillie, Nam Joong Jeon, Tae-Youl Yang, and Jangwon Seo*

“Transparent Electrodes Consisting of a Surface-Treated Based Buffer Layer Based on Tungsten Oxide for Semitransparent Perovskite Solar Cells and Four-Terminal Tandem Applications”

Small Methods, 2000074 (2020). [Front Cover] 

• “Development of Interlayers for Highly Stable Perovskite Solar Cells (페로브스카이트 태양전지 고안정성 층간소재 

기술 개발)” (2022K1A4A8A02079724)

Ministry of Science & ICT (과학기술정보통신부), 

2022-07-01 ~ 2024-12-31 (750,000,000 Won), PI (책임자).

• "Air and Space Perovskite Solar Cell Research (항공·우주용 페로스브카이트 태양전지 연구 )" (KK2362-141)

Korea Research Institute of Chemical Technology (KRICT),

2023-04-01 ~ 2023-12-31 (20,000,000 Won), PI (책임자).