Improving the stability of the perovskite solar cells by V2O5 modified transport layer film

Abstract

This study describes a method for producing highly stable perovskite solar cells (PSCs). On the basis of conventional PSCs, a high-performance device was prepared using a vanadium pentoxide (V₂O₅) film to modify the poly(3,4-ethylene dioxy-thiophene)–poly(styrene sulfonate) (PEDOT:PSS) hole transport layer (HTL). The V₂O₅ modified layer prevents the acidic PEDOT:PSS film from etching the indium tin oxide (ITO) electrode and maintains the stability of the PSC structure. In addition, a 4,7-diphenyl-1,10-phenanthroline (Bphen) modified layer prevented the photoactive layer film from coming into direct contact with the Ag electrode to enhance the lifetime of the PSC stored in the air. In our study, a stable power conversion efficiency (PCE) of 15.49% was achieved using this method. Compared to the same type of devices, this type of device exhibited excellent performance and its stability was much higher than that of other device structures when stored in air. On modifying the transport layers to enhance the stability and longevity of the PSC, a method is provided for reference for further research.