Organic compound passivation for perovskite solar cells with improving stability and photoelectric performance

Abstract

Herein, we report highly efficient and stable triple cation perovskite solar cells (PSCs) with the structure of FTO/TiO2/perovskite/spiro-OMeTAD/Ag, in which we introduce aminophylline (APL) as an additive into the perovskite precursor solution to improve efficiency and stability. The APL additive results in increased device current density (JSC) (23.07–23.86 mA/cm2), fill factor (FF) (77.9–81.82%) and open-circuit voltage (VOC) (1.09–1.13 V), leading to an improved power conversion efficiency (PCE) of 22.11% compared to control devices (19.62%). It is worth noting that unpackaged devices employing the APL additive can remain 60% of their initial PCE in the air (at a humidity of 25–30%) after 100 days, whereas control devices merely retain less than 14% of the initial efficiency.