作者
Grace Dansoa Tabi,Dang‐Thuan Nguyen,Wensheng Liang,Wei-Fu Ji,Teng Lü,Thành Trần‐Phú,Olivier Lee Cheong Lem,Azul Osorio Mayon,Keqing Huang,Li-Chun Chang,Hualin Zhan,Viqar Uddin Ahmad,Arafat Mahmud,Yanxia Hou,Wei Wang,Anh Dinh Bui,Hieu T. Nguyen,Yun Liu,Heping Shen,Kylie Catchpole,Klaus Weber,Thomas P. White,Daniel Walter,The Duong
摘要
This study demonstrates the transformative impact of incorporating poly(vinylidene fluoride-co-trifluoroethylene) P(VDF-TRFE) as an additive in the hole transport layer (HTL) of 2,2′,7,7′-Tetrakis[N,N-di(4-methoxyphenyl)amino]-9,9′-spirobifluorene (Spiro-OMeTAD). The P(VDF-TRFE) additive forms resilient coordination bonds with 4-tert-butylpyridine (TBP) and lithium bis(trifluoromethanesulfonyl)imide additives, which mitigates TBP evaporation and improves Spiro-OMeTAD film quality. In addition, we observed improvements in solar cell current–voltage characteristics consistent with increased Spiro-OMeTAD conductivity and suppressed non-radiative recombination at the HTL/perovskite interface. P(VDF-TRFE)-integrated devices exhibit an increment in power conversion efficiency (PCE) up to 24.1 % (reverse scan) from a reference PCE of 21.4 %. Furthermore, the unencapsulated P(VDF-TRFE)-integrated devices demonstrate improved stability, retaining over 90 % PCE after 45 days in an ambient atmosphere in the dark and 94 % PCE after 1080 h of continuous light-soaking in a nitrogen environment. This work demonstrates how additive engineering, as exemplified by P(VDF-TRFE), can effectively address stability and performance challenges within Spiro-OMeTAD in perovskite solar cells.