In this work, we reported an efficient and universal method to fabricate perovskite quantum dot (PQD) solar cells with enhanced efficiency. Through dissolving an optimal amount of conjugated polymers in a PQD matrix solution to fabricate a polymer-QD bulk heterojunction hybrid layer located at PQD/hole transporting layer (HTL) interfaces, the resultant solar cell devices exhibit significantly enhanced short-circuit current density and efficiency. In-depth characterization indicates that adding an optimal amount of conjugated polymers to the PQD film can effectively reduce pin-holes, resulting in more efficient interfacial charge transfer and decreased carrier recombination loss. More importantly, it shows that the highest occupied molecular orbital (HOMO) energy level of the conjugated polymer is crucial for achieving improved carrier transport at the PQD/HTL interfaces. Through rational selection of conjugated polymers, we achieved the best power conversion efficiency of ∼14% and 13.2% for CsPbI₃ and FAPbI₃ PQD based solar cells respectively, placing them at the forefront of all reported PQD solar cells. These findings will provide insights into well controlling organic–inorganic interfaces to improve current PQD based photovoltaic (PV) devices.

中文翻译：

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受益于共轭聚合物-量子点本体异质结连接层的高效钙钛矿量子点太阳能电池

在这项工作中，我们报告了一种高效且通用的方法，可提高效率来制造钙钛矿量子点（PQD）太阳能电池。通过将最佳量的共轭聚合物溶解在PQD基质溶液中以制造位于PQD /空穴传输层（HTL）界面的聚合物-QD本体异质结杂化层，所得太阳能电池器件的短路电流密度和效率大大提高。 。深入的表征表明，向PQD膜中添加最佳量的共轭聚合物可以有效减少针孔，从而导致更有效的界面电荷转移和减少的载流子复合损失。更重要的是，它表明，共轭聚合物的最高占据分子轨道（HOMO）能级对于在PQD / HTL界面实现改善的载流子传输至关重要。通过合理选择共轭聚合物，对于CsPbI，我们获得了约14％和13.2％的最佳功率转换效率₃和FAPbI ₃ PQD太阳能电池分别放置在所有报告的PQD太阳能电池的最前列。这些发现将为更好地控制有机-无机界面以改善当前基于PQD的光伏（PV）设备提供见识。