Although revolutionary progress in power conversion efficiencies (PCEs) of perovskite solar cells (PSCs) greater than 22% has accompanied significant advances in materials engineering, processing, and device architectures, the selection of proper hole transporting materials (HTMs) is still critical for high efficiency, low-cost and long-term stability. The PSCs community is actively investigating a group of HTMs for high efficiency and long-term stability with commercial viability. In this context, inorganic nickel oxide (NiO_x)-HTMs possess the advantages of energetically favorable energy band positions, high hole mobility, superior chemical stability, and low cost manufacturing. Herein, we address the initial breakthroughs and recent progress in NiO_x-HTMs for PSCs. In addition to synthetic routes and deposition techniques used for NiO_x-HTMs in two major device architectures (p-i-n and n-i-p structure), the stability and cost-breakdown of PSCs are evaluated in details. Finally, future directions for further improvements on issues such as high efficiency, stability and low-cost of PSCs based on NiO_x-HTMs are also provided.

尽管钙钛矿太阳能电池（PSC）的功率转换效率（PCE）的革命性进步超过22％，伴随着材料工程，工艺和器件架构的重大进步，但选择合适的空穴传输材料（HTM）仍然对提高材料的利用率至关重要。效率，低成本和长期稳定性。PSC社区正在积极研究一组HTM，以实现高效率和长期稳定性以及商业可行性。在这种情况下，无机氧化镍（NiO _x）-HTM具有能量上有利的能带位置，高空穴迁移率，优异的化学稳定性和低成本制造的优点。在此，我们将探讨NiO _x的初步突破和最新进展-用于PSC的-HTM。除了在两种主要设备架构（引脚和压区结构）中用于NiO _x -HTM的合成路线和沉积技术之外，还对PSC的稳定性和成本细分进行了详细评估。最后，还提供了进一步改进基于NiO _x -HTM的PSC的效率，稳定性和低成本等问题的未来方向。