Emerging all-inorganic perovskite nanocrystals can retain a desired crystal structure under ambient conditions and offer easy solution processability. In this work, we have demonstrated CsPbI₃ perovskite quantum dot (QD) solar cells with a remarkable efficiency approaching 13% and an extremely low energy loss of 0.45 eV by employing a series of dopant-free polymeric hole-transporting materials (HTMs). The CsPbI₃ QD solar cells use polymer HTMs to achieve efficient charge extraction at QD/polymer interfaces and avoid device instability caused by complex doping and oxidation processes required by conventional Spiro-OMeTAD. Meanwhile, the CsPbI₃ QD photovoltaic devices can be fabricated at room temperature and exhibit more reproducible film quality, showing potential advantages over current all-inorganic thin-film perovskite solar cells. We believe that our findings will catalyze the development of new device structures, specifically for perovskite QDs, and help realize the promising potential of all-inorganic perovskite solar cells.

新兴的全无机钙钛矿纳米晶体可以在环境条件下保留所需的晶体结构，并提供易于溶液加工的性能。在这项工作中，我们已经证明了CsPbI ₃钙钛矿量子点（QD）太阳能电池，通过使用一系列无掺杂剂的聚合物空穴传输材料（HTM），其效率接近13％，能量损耗极低，仅为0.45 eV。CsPbI ₃ QD太阳能电池使用聚合物HTM来实现QD /聚合物界面上的有效电荷提取，并避免了常规Spiro-OMeTAD所需的复杂掺杂和氧化过程所导致的器件不稳定。同时，CsPbI ₃QD光伏器件可以在室温下制造，并具有更高的可复制膜质量，与目前的全无机薄膜钙钛矿太阳能电池相比，具有潜在的优势。我们相信，我们的发现将促进特别针对钙钛矿量子点的新型器件结构的发展，并有助于实现全无机钙钛矿太阳能电池的有前途的潜力。