Publications:

• George Kwesi Asare,† Minwoo Lee,† Joshua Sraku Adu, Ram Datt, Wing Chung Tsoi, Trystan Watson, Xiaojing Hao, Juhong Oh, Chang Eun Song, Behrang H. Hamadani,*  Jae Sung Yun* and Helen Hejin Park* 

"Redox-Buffering PEAI-CeOx Passivation Suppresses Thermo-Mechanical Degradation in Perovskite Solar Cells Under Rapid Thermal Cycling" 

Adv. Energy Mater.  accepted (2026). DOI: 10.1002/aenm.71312

• Joshua Sraku Adu, George Kwesi Asare, and Helen Hejin Park*

"Atomic Layer Deposition of Metal Halide Perovskites: Chemistry, Growth Mechanisms, and Emerging Prospects" Chem. Comm. 62, 7087-7100 (2026). 

• Joshua Sraku Adu, George Kwesi Asare, Byungha Shin,* David J. Fermin,* and Helen Hejin Park*

“Bilayer of Atomic Layer Deposition and Solution-Processed Tin Dioxide as a Pathway to High-Performance Electron Transport Layers for Perovskite Solar Cells”

Solar RRL e202500617 (2025).

• George Kwesi Asare, Joshua Sraku Adu, Byungha Shin,* David J. Fermin,* and Helen Hejin Park*

“Perspective: Atomic Layer Deposition Strategies for Surface Passivation of Metal-Halide Perovskite Absorbers”

Electron. Mater. Lett. 21, 331–336 (2025). 

• 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]

Publications:

• George Kwesi Asare,† Minwoo Lee,† Joshua Sraku Adu, Ram Datt, Wing Chung Tsoi, Trystan Watson, Xiaojing Hao, Juhong Oh, Chang Eun Song, Behrang H. Hamadani,*  Jae Sung Yun* and Helen Hejin Park* 

"Redox-Buffering PEAI-CeOx Passivation Suppresses Thermo-Mechanical Degradation in Perovskite Solar Cells Under Rapid Thermal Cycling" 

Adv. Energy Mater.  accepted (2026). DOI: 10.1002/aenm.71312

• Joshua Sraku Adu, George Kwesi Asare, and Helen Hejin Park*

"Atomic Layer Deposition of Metal Halide Perovskites: Chemistry, Growth Mechanisms, and Emerging Prospects" 

Chem. Comm. 62, 7087-7100 (2026). 

• Minwoo Lee,† George Kwesi Asare,† Tommy H. Richards, Dong Gyu Leee, Tae Kyung Lee, Jongsung Parkg, Juhong Oh, Jihoo Lim, Martin A. Green, Xiaojing Hao,* Dohyung Kim,*  Helen Hejin Park,* and Jae Sung Yun* 

"Towards Space Compatible Perovskite Solar Cells: Guidelines for Thermal Shock Resilience and Near Space Balloon Testing" 

Energy Environ. Sci. 19, 2557-2568 (2026). [Cover]

• Minwoo Lee,† George Kwesi Asare,† Kaiwen Sun, Siwon Yun, Jongchul Lim, Dong Han Seo, Hongjae Shim, Martin A. Green, Charlie Chandler, Mark Baker, Jihoo Lim, Xiaojing Hao,* Helen Hejin Park,* and Jae Sung Yun* 

"Cerium Oxide Incorporation for Radiation Tolerance and Stability in Perovskite Solar Cells" 

ACS Energy Lett. 11, 1, 389–400 (2026). [Cover]

• Choongman Moon,† Changhyun Kim,† Jinhong Min,† Jaehyuk Koh, Passarut Boonmongkolras, George Kwesi Asare, Frank Hollmann, Helen Hejin Park,* Chan Beum Park,* and Byungha Shin*

 “Halide Perovskite Stabilized in a Photoelectrochemical Environment by Impermeable Single Crystal TiO2 for Semi-Artificial Photosynthesis”

J. Mater. Chem. A 13, 40908-40918 (2025). 

• Joshua Sraku Adu, George Kwesi Asare, Byungha Shin,* David J. Fermin,* and Helen Hejin Park*

“Bilayer of Atomic Layer Deposition and Solution-Processed Tin Dioxide as a Pathway to High-Performance Electron Transport Layers for Perovskite Solar Cells”

Solar RRL e202500617 (2025).

• George Kwesi Asare, Joshua Sraku Adu, Byungha Shin,* David J. Fermin,* and Helen Hejin Park*

“Perspective: Atomic Layer Deposition Strategies for Surface Passivation of Metal-Halide Perovskite Absorbers”

Electron. Mater. Lett. 21, 331–336 (2025).

• 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).