光阳极的结构设计是量子点太阳能电池(QDSCs)研究中的热点之一。本项目针对CdSe/TiO2光阳极中界面处光生载流子易复合的问题，对其结构及界面进行调控，构筑梯度有序的CdSe量子点敏化金红石@锐钛矿核壳TiO2纳米棒结构，以提高QDSCs的光电转换效率。首先，采用原位溶解-再结晶的方法，制备金红石@锐钛矿核壳结构的TiO2纳米棒阵列，利用壳层锐钛矿晶格缺陷对电子的高效注入和核层金红石单晶对电子高效传输的协同作用，提高光生电子的注入和传输效率；然后，利用取向生长和奥斯瓦尔德熟化协同作用，在该纳米棒表面负载尺寸由小到大呈梯度分布的CdSe量子点，实现沿入射光方向依次捕获波长从短到长的太阳光，获得“彩虹”光阳极，提高光生激子产率。最后，揭示锐钛矿在金红石纳米棒表面的形核及生长机理，阐明CdSe量子点梯度有序化的演化机制，建立界面结构与光电性能之间的依赖关系，为开发高效QDSCs提供新途径。

Photoanode structure design is one of the research hotspots in quantum dot solar cells (QDSCs). In order to reduce the recombination of photoinduced carries at the interface of CdSe/TiO2 photoande, the rutile@anatase core-shell TiO2 nanorod arrays coupled with gradient-ordered CdSe quantum dots (QDs) will be constructed by tuning the structure and its interface of CdSe/TiO2 photoanode, which is expected to increase the photoelectric conversion efficiency (PCE) of QDSCs. First, rutile@anatase core-shell TiO2 nanorod arrays will be prepared by in-situ dissolution and recrystalization method. The injection and transportation efficiency of photo-induced electrons could be improved by the synergistic effect from crystal defects of the anatase nanoparticle layer for the high photo-induced electron injection efficient and the rutile single crystal core for the high photo-induced electron transportation efficiency. Then, gradient-ordered CdSe QDs from small to large sizes will be loaded on rutile@anatase core-shell TiO2 nanorod arrays by the synergistic effect of oriented attachment and Ostwald ripening. Thus, this structure could capture the sun light from the short-to-long wavelength along the incident light direction to obtain a "rainbow" photoanode, and subsequently increase the productivity of photo-induced excitons. Finally, the nucleation and growth mechanism of anatase on rutile will be revealed, the evolution mechanism of the gradient-ordered CdSe QDs along the axial of TiO2 nanorods will be clarified, and the relationship between their interface structure and photoelectric properties will be established. It is expected to provide a novel material design strategy for developing QDSCs with excellent photoelectric properties.