Inorganic perovskite solar cells based on carbon electrodes

The power conversion efficiencies of organic-inorganic hybrid perovskite solar cells (PSCs) have been boosted from 3.8% to over 25% in about ten years. However, low device stability still impedes their practical applications. In the last few years, the inorganic PSCs based on carbon electrodes (C–PSCs) have gradually become one of the promising resolutions, and up to now, much progress has been made. Herein, recent developments in C–PSCs, including (1) device structure and working principles, (2) categorical progress of CsPbBr3, CsPbI3-xBrx, CsPbI3 and other inorganic C–PSCs, are reviewed. Promising research directions (e.g. developing suitable deposition methods, improving phase stability, tuning energy band structure, modifying perovskite/carbon interface and exploiting new inorganic perovskites) are then suggested to promote the development of inorganic C–PSCs.