biostudies-literatureWang SNational Natural Science Foundation of China12544-12551https://www.ebi.ac.uk/biostudies/studies/S-EPMC9040431biostudies-literatureUnknown12(20)Spinel NiCo₂O₄ is a promising p-type semiconductor for optoelectronic devices; however, it is difficult to prepare uniform and large-area NiCo₂O₄ films, which hinders its application as a hole transport material for perovskite solar cells (PSCs). In this study, a novel, mild, and low-cost KCl-assisted electrochemical deposition (ECD) approach was developed to directly prepare a uniform NiCo₂O₄ film on a fluorine-doped tin oxide (FTO) substrate. A uniform NiCo₂O₄ film prepared through an ECD approach was used as a hole-transport layer (HTL) in inverted PSCs. The resulting NiCo₂O₄ HTL-based device achieved a power conversion efficiency (PCE) of 19.24% with negligible hysteresis and eRSC advancesNiCo₂O₄ thin film prepared by electrochemical deposition as a hole-transport layer for efficient inverted perovskite solar cells.PMC904043122172011Sun LShan YWang SLi FLiu CWang LfalseNiCo₂O₄ thin film prepared by electrochemical deposition as a hole-transport layer for efficient inverted perovskite solar cells.Spinel NiCo₂O₄ is a promising p-type semiconductor for optoelectronic devices; however, it is difficult to prepare uniform and large-area NiCo₂O₄ films, which hinders its application as a hole transport material for perovskite solar cells (PSCs). In this study, a novel, mild, and low-cost KCl-assisted electrochemical deposition (ECD) approach was developed to directly prepare a uniform NiCo₂O₄ film on a fluorine-doped tin oxide (FTO) substrate. A uniform NiCo₂O₄ film prepared through an ECD approach was used as a hole-transport layer (HTL) in inverted PSCs. The resulting NiCo₂O₄ HTL-based device achieved a power conversion efficiency (PCE) of 19.24% with negligible hysteresis and e2022-01-01T00:00:00Z2022 Apr2025-04-26T04:01:57.818Z2025-04-06T10:57:10.213ZS-EPMC90404313548036810.1039/d2ra01816k