Abstract The surface passivation strategy is one of the effective ways to improve the power conversion efficiency (PCE) of quantum dots-sensitized solar cells (QDSSCs). In this work, a novel ZnS/SiO2 coating serves as the passivation layers for the CdS/CdSe co-sensitized solar cells based on zinc titanium mixed metal oxides (MMOs) obtained from layered double hydroxides (LDHs) precursor. The incorporation of passivation layers effectively improved the performance of the corresponding CdS/CdSe quantum dots co-sensitized solar cells and the best PCE of 4.91% has been achieved, which represents an over 55% improvement than that of devices without passivation. The effects of ZnS/SiO2 double passivation layers were systematically investigated, especially by 2D time-resolved fluorescence imaging and electrochemical impedance spectroscopy technique. It was revealed that the existence of ZnS/SiO2 outer layers caused the suppression of charge recombination, higher electrons collection efficiency, and superior surface quality.

中文翻译：

---

基于锌钛混合金属氧化物的新型ZnS/SiO2双钝化层用于CdS/CdSe量子点共敏化太阳能电池

摘要 表面钝化策略是提高量子点敏化太阳能电池（QDSSCs）功率转换效率（PCE）的有效途径之一。在这项工作中，一种新型的 ZnS/SiO2 涂层作为 CdS/CdSe 共敏化太阳能电池的钝化层，其基于从层状双氢氧化物 (LDH) 前驱体获得的锌钛混合金属氧化物 (MMO)。钝化层的加入有效地提高了相应的 CdS/CdSe 量子点共敏太阳能电池的性能，实现了 4.91% 的最佳 PCE，比未钝化的器件提高了 55% 以上。系统地研究了 ZnS/SiO2 双钝化层的影响，特别是通过 2D 时间分辨荧光成像和电化学阻抗谱技术。