改性多级介孔二氧化钛纳米材料的制备与太阳能电池性能研究

研发新型可再生清洁能源，特别是太阳能电池已成为全球科学界的当务之急。二氧化钛作为太阳能电池光阳极虽然性能优异，但其光捕获率低和电子-空穴再复合率高，限制了其实用化进程。而改性多级介孔TiO2具有光吸收范围广和电子迁移率高的优点，在提高电池光电性能上具有独特的优势。本项目旨在提高太阳能电池的光电转换效率，采用水热法构筑窄带隙半导体/纳米贵金属/氮掺杂三维分级介孔TiO2材料，实现Z机制材料体系的构建和控制。以SEM、TEM、XRD、XPS和BET等研究材料的晶体形貌、比表面、孔体积和化学键合态等微观形貌。分析材料体系的光学性能，研究增强材料体系光学性能的原理。测试电池的光电化学性能，分析光捕获率、染料吸附量、电子-空穴对分离与电子传输速率对电池光电性能的影响规律，建立与提高光电转换效率相关的模型和影响机制。本研究为太阳能电池光阳极材料的设计和制备提供了新思路，具有重要理论意义和应用价值。

Developing the novel renewable clean energy, especially solar cell has drawn extensive attention. Solar Cells based on titanium dioxide photoanode materials displays execllent performance, However, TiO2 has various drawbacks, such as low light harvesting efficiency and highrecombination rate of photogenerated electrons and holes, which limit its practical process. By contrast, modified hierarchical mesoporous TiO2 nanostructured photoanodes exhibit unique potential in improving photoelectric performance,due to their wide light absorption range and high electron mobility. This project is aimed to improve the photoelectric conversion efficiency of solar cells. To be specific, three-dimensional hierarchical of narrow bandgap semiconductor/noble metal/N doped mesoporous TiO2 nanomaterials are synthesized via a facile hydrothermal route to achieve a controllable Z-mechanism system. The crystal morphology, surface area, pore volume and chemical bond state of the 3D hierarchical TiO2 composites are investigated using SEM, TEM, XRD, XPS and BET. The optical property of the 3D hierarchical TiO2 composites are measured, in order to analyze the enhanced mechanism of the 3D TiO2 composites. The photochemical properties of Solar Cell are tested, for a thorough discussion on synergistic effects between the light harvesting, dye adsorption, charge separation, and electronic transmission rate on the photoelectric performance. Then the model and influence mechanism related to methods of improving photoelectric conversion efficiency will established. The successful implementation of this project will provide a new horizon for the designing and preparation of Solar Cell materials, possessing significant value in both theoretical research and practical application.