Constructing the highly efficient and stable quasi-solid-state even solid-state devices is one of the most significant tendency in the field of quantum dots sensitized solar cells (QDSCs). Herein, highly efficient and stable quasi-solid-state (QS)-QDSCs devices were fabricated via synergistically combining the TiO₂-sol interconnecting-modified photoanodes with alginate hydrogel (AH)-assisted electrolyte films. TiO₂-sol binding agent could incorporate into the surface and voids of TiO₂ particles, which increased the surface area and roughness for QDs loading and induced better connection between the neighboring particles. Meanwhile, the AH-assisted QS-electrolyte films possessed the crosslinking hydrogel network structure and exhibited the perfect interfacial contact with the modified TiO₂ surface, thus enhancing the ion transport and redox reaction of polysulfide couple. Benefited from the synergistic effect of TiO₂-sol modified photoanodes and alginate hydrogel (AH)-assisted electrolytes, a champion power conversion efficiency (PCE) of 8.87% for model ZnCuInSe (ZCISe) based QS-QDSCs was achieved with an enhancement of near 10% related to that of the devices based the pristine devices (8.01%), and very close to that of liquid-junction QDSCs (9.06%). Moreover, the constructed QS-QDSCs devices exhibit the excellent stability. This work thus provides a facile and effective strategy to achieve the QS-QDSCs devices with both of high efficiency and good stability.

在量子点敏化太阳能电池（QDSC）领域中，构建高效，稳定的准固态甚至固态器件是最重要的趋势之一。在此，通过将TiO _2-溶胶互连修饰的光阳极与藻酸盐水凝胶（AH）辅助的电解质膜协同结合，制备了高效且稳定的准固态（QS）-QDSCs器件。TiO _2-溶胶粘合剂可掺入TiO ₂的表面和空隙中颗粒，这增加了QD加载的表面积和粗糙度，并引起了相邻颗粒之间的更好连接。同时，AH辅助QS电解质膜具有交联水凝胶网络结构，与改性TiO ₂表面呈现出完美的界面接触，从而增强了多硫化物对的离子迁移和氧化还原反应。受益于TiO ₂的协同作用溶胶改性的光阳极和藻酸盐水凝胶（AH）辅助电解质，基于模型ZnCuInSe（ZCISe）的QS-QDSC的最佳功率转换效率（PCE）为8.87％，与该器件的性能相比提高了近10％基于原始器件（8.01％），非常接近液体连接QDSC（9.06％）。此外，构造的QS-QDSCs器件具有出色的稳定性。因此，这项工作为实现具有高效率和良好稳定性的QS-QDSCs器件提供了一种简便有效的策略。