| Title |
Fluorinated methylammonium cation containing perovskite solar cells with over 25% power conversion efficiency |
| Authors |
Mikuciunaite, Justina ; Ding, Bin ; Yang, Yuxuan ; Gao, Xiao-Xin ; Valipour, Vida ; Ding, Yong ; Astani, Negar Ashari ; Romano-deGea, Jan ; Frederiksen, Lindsey E. K ; Tirani, Farzaneh Fadaei ; Getautis, Vytautas ; Zhang, Yi ; Nazeeruddin, Mohammad Khaja ; Rakstys, Kasparas |
| DOI |
10.1002/aenm.71396 |
| Full Text |
|
| Is Part of |
Advanced energy materials.. Weinheim : Wiley-VCH. 2026, Early access, p. 1-10.. ISSN 1614-6832. eISSN 1614-6840 |
| Keywords [eng] |
A-site ; cation ; fluorinated ; methylammonium ; perovskite ; solar cell |
| Abstract [eng] |
High-performance perovskite solar cells (PSCs) are typically made using formamidinium CH(NH2)2+ (FA+), cesium Cs+, and the thermally unstable methylammonium CH3NH3+ (MA+) monovalent cations. Excluding unstable MA+ leads to perovskite compositions with increased stabilities and decreased bandgaps. This study introduces a novel approach using a simple fluorinated methylammonium CFH2NH3+ (FMA+) cation capable of doping into the perovskite-framework. With the addition of an optimized quantity of 0.8 mol% FMAI, perovskite compositions are thermally more stable, enabling more reproducible n-i-p PSC performance with a power conversion efficiency of 25.67%. The PSCs exhibit operational stability over 2000 h. Spectroscopic and computational analyses suggest that FMAI may play a dual role as a fluorinated ammonium additive capable of doping into the perovskite and as a chemically non-innocent precursor producing passivating species. |
| Published |
Weinheim : Wiley-VCH |
| Type |
Journal article |
| Language |
English |
| Publication date |
2026 |
| CC license |
|
