Alleviating hysteresis and improving device stability of perovskite solar cells via alternate voltage sweeps

Xia Chao¹, Song Wei-Dong¹, Zhang Chong-Zhen¹, Yuan Song-Yang¹, Hu Wen-Xiao¹, Qin Ping¹, Wang Ru-Peng¹, Zhao Liang-Liang¹, Wang Xing-Fu¹, He Miao¹, Li Shu-Ti^{1, 2, †}

(color online) (a) Schematic diagram of overall electric field in perovskite solar cells. (b) C–V characteristics for FTO/compact TiO /MAPbI Cl /Spiro-OMeTAD/Ag devices under different conditions.