Abstract：
Nickel oxide (NiOX) is an ideal inorganic hole transport material for the fabrication of inverted perovskite solar cells owing to its excellent optical and semiconductor properties. Currently, the main research on developing the performance of NiOX-based perovskite solar cells focuses on improving the conductivity of NiOX thin films and preventing the redox reactions between metal cations (Ni3+ on the surface of NiOX) and organic cations (FA+ or MA+ in the perovskite precursors) at the NiOX/perovskite interface. In this study, a new type of interface defects in NiOX-based CsPbI2Br solar cells is reported. That is the Pb2+ from CsPbI2Br perovskites can diffuse into the lattice of NiOX surface as the annealing temperature of perovskites changes. The diffusion of Pb2+ increases the ratio of Ni3+/Ni2+ on the surface of NiOX, leading to an increase in the density of trap state at the interface between NiOX and perovskites, which eventually results in a serious decline in the photovoltaic performance of solar cells.
摘要：
氧化镍（NiOX）具有优异的光学和半导体性能，是制备倒置钙钛矿太阳能电池的理想无机空穴传输材料。目前,关于开发基于NiOX的钙钛矿太阳能电池性能的主要研究集中在提高NiOX薄膜的电导率以及防止金属阳离子（NiOX表面上的Ni3）与有机阳离子（钙钛矿前体中的FA或MA）之间的氧化还原反应。NiOX/钙钛矿界面。在这项研究中,报道了基于NiOX的CsPbI2Br太阳能电池中的一种新型界面缺陷。也就是说，随着钙钛矿退火温度的变化，CsPbI2Br钙钛矿的Pb2可以扩散到NiOX表面的晶格中。Pb2+的扩散增加了Ni3+/Ni2+在NiOx表面的比例,导致NiOX和钙钛矿之间的界面处的陷阱态密度增加，最终导致太阳能电池的光伏性能严重下降。
