Interfacial engineering with a ferrocene derivative for air-stable inverted perovskite solar cells with high fill factor of 83.57

• Published in: Solar energy materials and solar cells Vol. 272; p. 112936
• Main Authors: Hu, Kexin, Peng, Jin, Wang, Qi, Deng, Lu, Deng, Chen, Xu, Maoxia, Zhang, Zetan, Ren, Haorong, Yang, Chengbin, Chen, Jingyu, Yu, Hua
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.08.2024
• Subjects: Air stability; Defect passivation; Ferrocene derivatives; Inverted perovskite solar cells; UV-Resistance; Ferrocene derivatives; Defect passivation; Air stability; Inverted perovskite solar cells; UV-Resistance
• ISSN: 0927-0248; 1879-3398
• DOI: 10.1016/j.solmat.2024.112936

Perovskite solar cells have demonstrated exceptional photovoltaic performance, but stability remains a challenge due to insufficient interfaces. In this work, a UV-resistance ferrocene derivative, 1,1′-bis (diphenylphosphine) ferrocene (DPPF), is introduced between the electron transport layer and the perovskite, reducing defect density by interaction with undercoordinated Pb2+, suppressing non-radiative recombination of charge carriers, and enhancing electron extraction. Desirable interfacial properties and homogeneous perovskite grains are formed, resulting in a champion power conversion efficiency (PCE) of 20.82 % and a significantly improved fill factor of 83.57 %. Moreover, DPPF can optimize the interfaces, provide a brand-new morphology with exceptional air durability, cover the active layer to restrain water and oxygen intrusion, and suppress metal electrode corrosion. Resultant devices without encapsulation have remained above 80 % of their initial PCE for 1400 h under 25 °C air and 50–60 % relative humidity conditions. •UV-resistance ferrocene derivative as defect passivator applied in perovskite solar cells.•The air-stability of the modified PSCs was remained 80 % above 1400 h.•DPPF modification increased fill factor from 78.93 % to 83.57 %.