钙钛矿型太阳电池是2013年《科学》评选的世界十大科技突破之一，是第三代太阳电池发展新的里程碑。研究钙钛矿型太阳电池对赶超太阳电池研究国际先进水平，提升我国太阳电池研发的自主创新能力具有重要意义。本课题以提高钙钛矿型太阳电池的光电转化效率和稳定性、降低成本为目标，以光电转换为核心，开展全钛基背投式PIN异质结钙钛矿型太阳电池研究。通过材料设计、合成制备、性质测定、结构表征、器件组装和效能评价，阐明异质结太阳电池钙钛矿吸光体、p-型半导体、n-型半导体和电极材料的能级匹配、界面匹配和结构匹配规律，厘清钙钛矿太阳电池载流子产生、传输、收集、湮灭等过程的演化机理和调控机制，揭示钙钛矿太阳电池的材料微观结构与宏观光伏性能之间关系，实现PIN异质结钙钛矿太阳电池的材料设计和可控制备，提供成本低、稳定性好、环境友好、光电转化效率超过18％的钙钛矿型太阳电池，为第三代太阳电池的开发利用提供理论支撑。

Perovskite-type solar cell is one of Science's Top 10 Breakthroughs in 2013, it is a new development milepost for the third generation solar cell. The study on the perovskite-type solar cells is significant for catching up with the international advanced level of solar cell research and enhancing our country's self-innovation ability for solar cell research and development. Aiming at decreasing the device cost, increasing the light-to-electric energy conversion efficiency and long-term stability of solar cells, focusing at the light-to-electic energy conversion, we perform the researches on perovskite-type solar cells based on PIN heterojunction with all titanium substrates and backside illumination. Through the materials' design and preparation, property measurement, structure characterization, and performance evaluation, the interface, energy and structure match rules among perovskite light absorber, p-type semiconductor, n-type semiconductor, and electrode materials in the heterojunction solar cells is illustrated, the evolution and regulation mechanisms of the generation, transportation, collection and recombination of charge carriers in the perovskite-type solar cells is clarified, the relationship between the microstructure of materials and the macro photovoltaic performance of the perovskite solar cells is illustrated, and the design and controllable preparation of the materials in PIN heterojunction perovskite solar cells is realized. Therefore, a perovskite solar cell prototype with low cost, good long-term stability, friendly environment and light-to-electric energy conversion efficiency over 18 % is provided, which will provide a theory support for the development and application of the third generation solar cells.