Organometallic halide-perovskite solar cells have undergone massive improvements in power conversion efficiency in the past decade, from around 4% in 2009 to 24% in 2019. A hotly debated issue in this field involves the investigation of economical, stable and power-efficient hole transport materials (HTMs) and electron transport materials in order to improve overall device performance and feasibility of mass production in the coming years. Even though the conventional (n-i-p) structure continues to be the most commonly used in perovskite solar cells, research in the field has shown that its potential for further commercial application is limited due to the higher J–V hysteresis and need for high temperature during fabrication. To address this issue, inverted (p-i-n) perovskite structures have been seriously examined because of their straightforward processability at low and moderate temperatures. These investigations have established that the HTMs are a significant part of the inverted (p-i-n) perovskite structure, which can render shape to a specific contact. They are perfect for reducing charge recombination and effective hole collection to enhance the overall performance of the device. This article examines in minute detail the different characteristics of inorganic hole transport materials used in inverted perovskite structures over the past decade, including power conversion efficiency, device configuration, energy band position and synthesis methods. It goes on to briefly discuss the stability analysis conducted to identify the factors which make perovskite unstable, so that possible ways to further optimize the performance parameters may be derived from the observations.

在过去的十年中，有机金属卤化物-钙钛矿型太阳能电池的功率转换效率得到了大幅提高，从2009年的约4％到2019年的24％。该领域中一个备受争议的问题涉及对经济，稳定和高能效的孔的研究传输材料（HTM）和电子传输材料，以改善未来几年的整体设备性能和批量生产的可行性。尽管常规的（n - i - p）结构仍然是钙钛矿太阳能电池中最常用的结构，但该领域的研究表明，由于较高的J – V，其在进一步商业应用中的潜力受到了限制。磁滞现象和制造过程中对高温的需求。为了解决这个问题，由于其在低温和中温下的直接可加工性，已经对倒置的（p - i - n）钙钛矿结构进行了认真的研究。这些研究已经确定，HTM是反向（p - i - n钙钛矿结构，可以使特定的接触形状。它们是减少电荷复合和有效收集空穴以增强器件整体性能的理想选择。本文详细分析了过去十年中用于倒钙钛矿结构的无机空穴传输材料的不同特性，包括功率转换效率，器件结构，能带位置和合成方法。继续简要讨论了进行稳定性分析以识别导致钙钛矿不稳定的因素，以便可以从观察中得出进一步优化性能参数的可能方法。