Composite electrode based on single-atom Ni doped graphene for planar carbon-based perovskite solar cells
Min Guo, Chenyang Wei, Congcong Liu, Kun Zhang, Haijun Su, Keyu Xie, Peng Zhai, Jun Zhang, Lin Liu
Abstract
In order to improve the inherently inefficient hole extraction from perovskite to carbon electrode in planar carbon-based perovskite solar cells (PSCs), herein, a novel composite electrode composed of single-atom Ni doped graphene (Ni-NG) for PSCs is proposed for the first time. Ni-NG with low work function provides a great driving force to improve the hole extraction at the interface. Meanwhile, Ni-NG with abundant single-atom Ni active sites and large specific surface area can accelerate charge transport and strengthen interface contact. Optimized PSCs with composite electrode based on Ni-NG achieved a champion power conversion efficiency (PCE) of 12.39%, higher than PSCs with pristine carbon electrode and composite electrode based on NG. Our work exploits the application of single-atom Ni doped graphene as carbon electrode and provides new insights into the structure design of carbon electrode to obtain efficient planar carbon-based PSCs.