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.