Pengfei Wu1,2,Shirong Wang1,2,Xianggao Li1,2,Fei Zhang1,2
Tianjin University1,Collaborative Innovation Center of Chemical Science and Engineering(Tianjin)2
Pengfei Wu1,2,Shirong Wang1,2,Xianggao Li1,2,Fei Zhang1,2
Tianjin University1,Collaborative Innovation Center of Chemical Science and Engineering(Tianjin)2
Here, we report an alternating-cation-interlayer (ACI)-phase 2D (n=2) passivation layer modulating the bulk and interfacial defects in the perovskite films simultaneously by the mixed GAI and MAI (MGM) treatment, leading to the suppressed nonradiative recombination, longer lifetime, higher mobility, and reduced trap density. Consequently, the devices’ performance is enhanced for both p-i-n and n-i-p structures, with the highest reaching ~24.0%. In addition, the MGM treatment can be applied to a wide range of perovskite compositions, including MA-, FA-, MAFA-, and CsFAMA- based lead halide perovskites, making it a general method for preparing efficient perovskite solar cells. Without encapsulation, the treated devices show improved shelf life (ISOS-D-1 stability) and real-life stability.