Perovskite solar cells (PSCs) have demonstrated excellent photovoltaic performance which currently rival the long-standing silicon solar cells’ efficiency. However, the relatively poor device operational stability of PSCs still limits their future commercialization. Binary sulfide is a category of materials with promising optoelectrical properties, which shows the potential to improve both the efficiency and stability of PSCs. Here we demonstrate that the inorganic tin monosulfide (SnS) can be an efficient dopant in 2,2′,7,7′-tetrakis(N,N-di-p-methoxy-phenylamine)-9,9′-spirobifluorene (spiro-OMeTAD) to form a composite hole transport layer (HTL) for PSCs. SnS nanoparticles (NPs) synthesized through a simple chemical precipitation method exhibit good crystallization and suitable band matching with the perovskites. The introduction of SnS NPs in Spiro-OMTAD HTLs enhanced charge extraction, reduced trap state density, and shallowed trap state energy level of the devices based on the composite HTLs. Therefore, the resulting solar cells employing SnS-doped spiro-OMeTAD HTLs delivered an improved stabilized power output efficiency of 21.75% as well as enhanced long-term stability and operational stability. Our results provide a simple method to modify the conventional spiro-OMeTAD and obtain PSCs with both high efficiency and good stability.

钙钛矿太阳能电池 (PSC) 已表现出优异的光伏性能，目前可与长期存在的硅太阳能电池的效率相媲美。然而，PSCs相对较差的设备运行稳定性仍然限制了它们未来的商业化。二元硫化物是一类具有良好光电性能的材料，显示出提高 PSC 效率和稳定性的潜力。在这里，我们证明了无机单硫化锡 (SnS) 可以是 2,2',7,7'-tetrakis( N , N -di- p-甲氧基-苯胺)-9,9'-螺二芴 (spiro-OMeTAD) 形成 PSC 的复合空穴传输层 (HTL)。通过简单的化学沉淀法合成的 SnS 纳米粒子 (NPs) 表现出良好的结晶性和与钙钛矿的合适的谱带匹配。在 Spiro-OMTAD HTL 中引入 SnS NP 增强了电荷提取，降低了陷阱态密度，并降低了基于复合 HTL 的器件的陷阱态能级。因此，所得到的采用 SnS 掺杂的螺-OMeTAD HTL 的太阳能电池提供了 21.75% 的稳定功率输出效率以及增强的长期稳定性和操作稳定性。我们的结果提供了一种简单的方法来修改传统的螺-OMeTAD 并获得高效和良好稳定性的 PSC。