Stability is the main challenge in the field of perovskite solar cells (PSCs). Finding new strategies is required to protect the PSCs from deteriorating agents such as humidity, heating, and illumination. Herein, a new electron transporting layer (ETL), i.e., CdSe/ZnS quantum dots (QDs), is proposed for the fabrication of efficient and stable PSCs. CdSe/ZnS QDs layer not only works as an ETL but also has downshifting property, which can improve both efficiency and stability of the PSCs. Using CdSe/ZnS QDs ETL with green emission, a PSC with maximum power conversion efficiency (PCE) of 18% is achieved. More importantly, the device shows great UV stability, much better than the device with TiO₂ ETL, where it retains 90% of its initial PCE value after 75 h under continuous UV illumination.

中文翻译：

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基于CdSe / ZnS量子点电子传输层的高效钙钛矿太阳能电池，具有出色的紫外线稳定性

稳定性是钙钛矿太阳能电池（PSC）领域的主要挑战。需要寻找新的策略来保护PSC免受诸如湿度，加热和照明等恶化因素的影响。在此，提出了一种新型的电子传输层（ETL），即CdSe / ZnS量子点（QDs），用于制备高效稳定的PSC。CdSe / ZnS QDs层不仅可以用作ETL，还具有降档性能，可以提高PSC的效率和稳定性。使用具有绿色发射的CdSe / ZnS QDs ETL，可以实现最大功率转换效率（PCE）为18％的PSC。更重要的是，该器件表现出出色的紫外线稳定性，远优于带有TiO ₂ ETL的器件，后者在连续的紫外线照射下保持75小时后仍保持其初始PCE值的90％。