Using Interfacial Contact Engineering to Solve Nickel Oxide/Perovskite Interface Contact Issues in Inverted Perovskite Solar Cells
Guibin Shen, Qingbin Cai, Hongye Dong, Xiaoning Wen, Xiangning Xu, Cheng Mu
Abstract
Perovskite is a promising photovoltaic material in the sustainable energy field. In inverted perovskite solar cells (PSCs), the bottom p-type hole transport materials play a crucial role in the device power conversion efficiency (PCE) and ambient stability. Nickel oxide (NiOX) is the most promising inorganic hole transport material for inverted PSCs. However, the inferior interfacial contact of NiOX/perovskite has limited the improvement of inverted PSC performance. Strategies for handling this interfacial contact issue are scarce, and most of them require expensive equipment and complex preparation procedures. Herein, a new facial route was introduced to enhance the NiOX/perovskite interfacial contact using a porous morphology produced with a polyvinyl butyral (PVB) additive. Moreover, a bilayer-NiOX hole transport layer structure was successfully designed and used for fabricating a high-performance inverted PSC. The device exhibited a PCE of 17.57% and sufficient stability in ambient air. Various characterizations were performed to investigate the effect of the bilayer-NiOX film on device performance. The PSC exhibited superior performance, which was because of the enhanced perovskite film quality and the excellent bilayer-NiOX charge transfer ability and trap density reduction.