将太阳能转变为电能是解决能源危机和环境问题的理想途径之一。基于光电转化的太阳能电池技术被认为是一种重要的解决方案，其核心是高效太阳能电池材料和器件的开发。本项目以染料敏化太阳能电池对电极材料的研发为背景，利用半导体结对材料表界面的电子分布进行调控，提高电催化性能，开发高效的染料敏化太阳能电池对电极材料。依据能带匹配原则构建基于硫属化合物的金属-半导体或半导体-半导体结的对电极材料；围绕半导体结材料的设计、合成、结构与表界面电子分布等特性间的关系等展开工作。重点研究硫属化合物半导体结的种类、能带结构和形貌结构等对催化还原I3-能力的影响和相互作用规律。探究半导体结提高电催化活性的微观作用机理，优化材料结构，设计并合成高性能硫属化合物半导体结对电极材料。

The conversion of solar energy to electrical energy is an attractive process to address both energy and environmental issues. Solar cell technology basing on photoelectric conversion is generally considered to be an important solution way. Under the guidance of heterojunctions theory, this project is aiming to improve the catalytic activity to reduce I3- by adjusting the electron distribution at surface/interface of materials via the heterojunctions and developing high efficient counter electrode (CE) materials for dye-sensitized solar cells (DSSCs). Metal-semiconductor and semiconductor-semiconductor heterojunctions will be built by using the chalcogenide semiconductors. Based on their energy schemes and chemical properties, different chalcogenide heterojunctions materials will be designed and synthesized. The effects of crystal structure, composition, morphologies structures and the electron distribution at surface/interface to the catalytic activity and CE performances will be studied. It will be focused research that how the types, energy structures and morphology affect the rectifying characteristics and catalytic activity to reduce I3-. Finally, the electron transfers and mass diffusion mechanism in the chalcogenide heterojunctions CE materials will be summarized. And the junctions will be optimized to obtain high performance CE materials for DSSCs.