We report an inverted perovskite solar cell (PSC) based on a solution-processed CuSCN thin film for hole transporting layer. Methylammonium lead iodide (MAPbI₃) perovskite film is formed on the CuSCN layer, which shows hysteresis-less current-voltage characteristics. Post-treatment of the CuSCN film with KSCN improves power conversion efficiency (PCE) from 11.9% to 14.9% due to main increment of photocurrent density from 16.71 to 19.20 mA/cm². From the test with various salts of KX (X = SCN, I and Br) and MSCN (M = K and Na), we have found that thiocyanate anion plays more critical role in improving photovoltaic parameters. Photoluminescence (PL) is more quenched and PL decay time is faster after post-treatment with KSCN, which is indicative of better charge separation and responsible for the improved photocurrent density. In addition interface recombination, estimated by impedance spectroscopy, is suppressed by the post-treatment with KSCN, which is related to the improved open-circuit voltage. PSCs with KSCN-treated CuSCN demonstrates better photo- and humidity-stability as compared to those with untreated CuSCN, which is likely to correlate with improved interface.

我们报道了一种基于固溶钙离子交换孔的CuSCN薄膜的倒钙钛矿太阳能电池（PSC）。在CuSCN层上形成了甲基铵碘化铅（MAPbI ₃）钙钛矿薄膜，该薄膜显示出无滞后的电流-电压特性。由于光电流密度从16.71  mA / cm ²主要增加，用KSCN对CuSCN膜进行后处理可将功率转换效率（PCE）从11.9％提高到14.9％。。从用各种KX盐（X = SCN，I和Br）和MSCN（M = K和Na）进行的测试中，我们发现硫氰酸根阴离子在改善光伏参数方面起着至关重要的作用。用KSCN后处理后，光致发光（PL）更加淬灭，PL衰减时间更快，这表明电荷分离效果更好，并负责改善光电流密度。另外，通过阻抗谱法估计的界面复合可通过用KSCN进行后处理来抑制，这与改善的开路电压有关。与未经处理的CuSCN相比，经KSCN处理的CuSCN的PSC表现出更好的光稳定性和湿度稳定性，这可能与界面改善有关。