Inorganic cesium lead halide perovskite solar cells (PSCs) have attracted great attention due to their remarkable thermal and moisture stability. However, the low photoelectric conversion efficiency (PCE) of inorganic PSCs due to the high trap state density, high carrier recombination rate, and poor carrier transport kinetics impedes their industrial applications. Herein, a remarkable bulk heterojunction structure coupling SnS quantum dots (QDs) with CsPbBr₃ is prepared for the first time via a facile spin‐coating process using a SnS‐QD‐dispersed toluene solution as an antisolvent. The introduction of SnS QDs provides extra crystallization sites and promotes the crystallization of perovskites along (100) and (200) faces. Meanwhile, the bulk heterojunction structure with matched energy structure can effectively reduce the trap state density of the perovskite film and improves the dynamic performance of carriers, suppressing the charge recombination rate and effectively boosting the PCE of solar cells. As a result, the optimal bulk heterojunction solar cell achieves a PCE of 8.01%, about 52% higher than that of the pristine solar cell. This work provides a low‐cost and facile strategy for preparing high‐performance bulk heterojunction PSCs and an effective method to boost the PCE by nontoxic QDs.

中文翻译：

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SnS量子点–CsPbBr3钙钛矿体异质结，可提高光电转换效率

无机卤化铯铅钙钛矿太阳能电池（PSC）由于其出色的热稳定性和湿气稳定性而备受关注。然而，由于高的陷阱态密度，高的载流子复合率和不良的载流子传输动力学，导致无机PSC的低光电转换效率（PCE）阻碍了它们的工业应用。在这里，一个显着的体异质结结构将SnS量子点（QDs）与CsPbBr ₃耦合通过使用SnS-QD分散的甲苯溶液作为抗溶剂，通过便捷的旋涂工艺首次制备。SnS QD的引入提供了额外的结晶位点，并促进了钙钛矿沿（100）和（200）面的结晶。同时，具有匹配能量结构的体异质结结构可以有效降低钙钛矿膜的陷阱态密度，提高载流子的动态性能，抑制电荷复合率，有效提高太阳能电池的PCE。结果，最佳的体异质结太阳能电池的PCE为8.01％，比原始太阳能电池的PCE高约52％。这项工作为制备高性能本体异质结PSC提供了一种低成本且简便的策略，并且是通过无毒QD增强PCE的有效方法。