Inactive (PbI <sub>2</sub> ) <sub>2</sub> RbCl stabilizes perovskite films for efficient solar cells
Yang Zhao(Institute of Semiconductors), Fei Ma(Institute of Semiconductors), Zihan Qu(Institute of Semiconductors), Shiqi Yu(Institute of Semiconductors), Tao Shen(Institute of Semiconductors), Hui‐Xiong Deng(Institute of Semiconductors), Xinbo Chu(Institute of Semiconductors), Xinxin Peng(Central South University), Yongbo Yuan(Central South University), Xingwang Zhang(Institute of Semiconductors), Jingbi You(Institute of Semiconductors)
Cited by 1,382
Abstract
In halide perovskite solar cells the formation of secondary-phase excess lead iodide (PbI 2 ) has some positive effects on power conversion efficiency (PCE) but can be detrimental to device stability and lead to large hysteresis effects in voltage sweeps. We converted PbI 2 into an inactive (PbI 2 ) 2 RbCl compound by RbCl doping, which effectively stabilizes the perovskite phase. We obtained a certified PCE of 25.6% for FAPbI 3 (FA, formamidinium) perovskite solar cells on the basis of this strategy. Devices retained 96% of their original PCE values after 1000 hours of shelf storage and 80% after 500 hours of thermal stability testing at 85°C.