Decoupling Contributions of Charge‐Transport Interlayers to Light‐Induced Degradation of p‐i‐n Perovskite Solar Cells

• DOI: 10.1002/solr.202000191
• Publication Date: 2020-05-08T09:05:45Z
• Authors: Mohamed Elnaggar; Aleksandra G. Bol...; Moneim Elshobaki; Sergey A. Tsarev; Yury S. Fedotov; Olga R. Yamilova; Sergey I. Bredikhin; Keith J. Stevenson; Sergey M. Aldoshin; Pavel A. Troshin
• Keywords: Degradation; Polystyrene sulfonate; Decoupling (probability); Polystyrene; Derivative (finance); Non-blocking I/O

There is growing evidence that the stability of perovskite solar cells (PSCs) strongly dependent on interface chemistry between absorber films and adjacent charge‐transport layers, whereas exact mechanistic pathways remain poorly understood. Herein, a straightforward approach presented for decoupling degradation effects induced by top fullerene‐based electron transport layer (ETL) various bottom hole‐transport (HTL) materials assembled in p‐i‐n PSCs. It shown chemical interaction MAPbI 3 with ETL comprised fullerene derivative most aggressively affects device operational stability. However, washing away degraded depositing fresh leads to restoration initial photovoltaic performance when perovskite/HTL not degraded. Following this approach, it possible compare photostability stacks HTLs. poly(3,4‐ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS) NiO x induce significant under light exposure, poly[bis(4‐phenyl)(2,4,6‐trimethylphenyl)amine] (PTAA) provides stable interface. A time‐of‐flight secondary ion mass spectrometry (ToF‐SIMS) analysis allows identification origins interactions The proposed research methodology revealed should facilitate development efficient