For a typical perovskite solar cell (PSC), the hole transport layer (HTL) plays a vital role in determining device performance and stability. Herein, for the first time, we demonstrate that a low-temperature solution-processed copper-niobium oxide (CuNbO_x) thin film, consisting of CuNbO₃ and CuNb₂O₆ phases, can serve as an efficient HTL to develop PSCs with high-performance and long-term stability simultaneously. The CuNbO_x thin film possesses high optical transparency in visible light, well-matched energy levels with perovskite, and excellent hole extraction capability from the perovskite layer. By optimizing the precursor concentration, the CuNbO_x-based device reaches the best power conversion efficiency (PCE) of 16.01% with negligible hysteresis. In comparison, the control device based on the extensively studied PEDOT:PSS HTL shows an obviously lower PCE of 10.13%. Besides exhibiting significant improvement in photovoltaic performance, our CuNbO_x-based device also shows much enhanced long-term stability than the control device. After 1000 h of storage in air without encapsulation, the CuNbO_x-based PSCs maintains ~78% of their initial efficiency, whereas the PCE of PEDOT:PSS-based PSCs drops to ~44% of the initial value. Overall, this study suggests that the utilization of the inorganic CuNbO_x thin film as the HTL provides a novel route for fabricating low-cost, high-performance, and stable PSCs.

对于典型的钙钛矿太阳能电池（PSC），空穴传输层（HTL）在确定器件性能和稳定性方面起着至关重要的作用。在这里，我们首次证明了由CuNbO ₃和CuNb ₂ O ₆相组成的低温固溶处理的铜铌氧化物（CuNbO _x）薄膜可以作为有效的HTL来开发具有高纯度的PSC。性能同时具有长期稳定性。CuNbO _x薄膜在可见光下具有高光学透明性，与钙钛矿具有良好的能级匹配，并且从钙钛矿层中具有出色的空穴提取能力。通过优化前驱物浓度，CuNbO _x器件的磁滞可忽略不计，可达到16.01％的最佳功率转换效率（PCE）。相比之下，基于广泛研究的PEDOT：PSS HTL的控制设备的PCE明显降低了10.13％。除了在光伏性能方面显示出显着改善之外，我们的基于CuNbO _x的设备还显示出比控制设备更高的长期稳定性。在没有封装的情况下在空气中存储1000小时后，基于CuNbO _x的PSC保持其初始效率的〜78 ％，而基于PEDOT：PSS的PSC的PCE下降至初始值的〜44 ％。总体而言，本研究表明，无机CuNbO的利用_X薄膜作为HTL提供了一种制造低成本，高性能，且稳定的PSC一个新途径。