All‐Inorganic Perovskite Solar Cells: Modification Strategies and Challenges

Abstract

Cesium‐based all‐inorganic wide‐bandgap perovskite solar cells (AIWPSCs) have been demonstrated with exceptional optoelectronic properties such as intrinsic optical wide‐bandgap and high thermal stability, which make them suitable candidates for the front sub‐cells of tandem solar cells (TSCs). Passivation of perovskite surface and interface is a matter of common interest in this community since all‐inorganic perovskites always suffer from non‐ideal crystallization such as phase impurity, high defect density, and non‐uniform morphology. Despite these shortcomings, numerous efforts have been devoted in recent years to pursuing high‐performance AIWPSCs, which exhibit an abruptly increased power conversion efficiency (PCE) from 2.9% to over 21.0%. In view of not having a thorough summary about the advancements on AIWPSCs, herein, a comprehensive review is given to highlight the recent device performance progress of AIWPSC, particularly focusing on the strategies to passivate the defects of all‐inorganic perovskite, namely, additive engineering, solvent engineering, interface modification, and the exploration of new charge transport materials (CTMs) for improving the phase stability and PCE of AIWPSCs. Finally, a conclusive outlook on AIWPSCs will be given to provide our perspectives aiming to inspire the further development of AIWPSCs.

Enhanced Efficiency and Stability of Sky Blue Perovskite Light-Emitting Diodes via Introducing Lead Acetate

“…The anti-solvent washing method, additive engineering, and interface modification are commonly used strategies to improve the film quality of perovskite film [ 12 , 13 , 14 ], where additive engineering involves adding additives to the precursor solution of perovskite, which can control the crystallization of the perovskite film, passivate defects, and enhance the charge carrier mobility. For example, the materials of Lewis bases can provide non-bonded electron pairs to coordinate with uncoordinated Pb 2+ or metal Pb clusters, which are the main point defects in perovskite films [ 13 ].…”