All-inorganic CsPbBr₃ perovskite solar cells (PSCs) are promising candidates to balance the stability and efficiency issues of organic-inorganic hybrid devices. However, the large energy barrier for charge transfer and narrow spectral response are still two challenging problems for performance improvement. We present here an organic bulk-heterojunction {poly(3-hexylthiophene-2,5-diyl):[6,6]-phenyl C61 butyric acid methyl ester (P3HT: PCBM)} photoactive layer to boost the charge extraction and to widen the spectral absorption, achieving an enhanced power conversion efficiency up to 8.94% by optimizing the thickness of P3HT: PCBM photoactive layer, which is much higher than 6.28% for the pristine CsPbBr₃ device. The interaction between the carbonyl group in PCBM and unsaturated Pb atom in the perovskite surface can effectively passivate the defects and reduce charge recombination. Furthermore, the coupling effect between PCBM and P3HT widens the spectral response from 540 to 650 nm for an increased short-circuit current density. More importantly, the devices are relatively stable over 75 days upon persistent attack by 70% relative humidity in air condition. These advantages of high efficiency, excellent long-term stability, cost-effectiveness and scalability may promote the commercialization of inorganic PSCs.

全无机CsPbBr ₃钙钛矿太阳能电池（PSC）是有望平衡有机-无机混合器件的稳定性和效率问题的候选材料。但是，用于电荷转移的较大能量壁垒和较窄的光谱响应仍然是提高性能的两个难题。我们在这里介绍一种有机本体-异质结{聚（3-己基噻吩-2,5-二基：[6,6]-苯基C61丁酸甲酯（P3HT：PCBM）}}光敏层，可促进电荷提取并加宽通过优化P3HT：PCBM光敏层的厚度，实现了光谱吸收，从而将功率转换效率提高了高达8.94％，远高于原始CsPbBr _3的6.28％设备。PCBM中的羰基与钙钛矿表面中的不饱和Pb原子之间的相互作用可以有效地钝化缺陷并减少电荷重组。此外，PCBM和P3HT之间的耦合效应将光谱响应从540 nm扩大到650 nm，从而增加了短路电流密度。更重要的是，在空气条件下持续受到70％相对湿度的持续攻击后，该设备在75天内相对稳定。这些高效率，出色的长期稳定性，成本效益和可扩展性的优势可以促进无机PSC的商业化。