卤化钙钛矿反相蛋白石用于噻吩类衍生物光催化聚合的研究

Due to the excellent optoelectronic properties, halide perovskite has attracted wide attention and demonstrated their great potential in the applications of solar cell and light emitting diodes. Up to now, the photocatalytic performance of halide perovskites is the cutting edge of the field. In this project, the halide perovskite inverse opals were prepared by using polystyrene microsphere as template, and the photocatalytic performance of the obtained materials on the polymerization of the thiophene derivatives was investigated. By tailoring the energy level of the thiophene derivative, morphology and the band gap of the halide perovskite inverse opal, the factors of the photocatalytic performance will be illustrated and the correlations between the structure and the performance will be established. In short, the project will be helpful for understanding structural effect on the photocatalytic performance of the halide perovskite and exploring the possibility of fabricating optoelectronic devices by photocatalysis.

得益于优异的光电性能，卤化钙钛矿材料受到广泛关注，并在太阳能电池、发光二极管中表现出极大的应用潜力。目前，钙钛矿材料的光催化剂性能是该领域的研究前沿。本项目通过聚苯乙烯小球为模板制备钙钛矿反相蛋白石材料，进而研究其对于噻吩类衍生物聚合反应的光催化性能。通过调节钙钛矿反相蛋白石材料的能级、形貌、能隙带以及噻吩衍生物的分子结构，揭示钙钛矿催化噻吩衍生物聚合的影响因素，建立材料的结构与性能之间的构效关系。本项目的研究将有利于深入理解结构因素对于钙钛矿催化性能的影响，为使用光催化方法制备光电器件提供基础。

基于卤化钙钛矿出色的光电性能，本项目研究了材料形貌、结晶度、能隙带、能级等因素对光催化噻吩类衍生物聚合的影响。研究结果显示，比表面积大、结晶度高的反相蛋白石钙钛矿材料在催化性能中显示出优势。钙钛矿量子点对卤化钙钛矿光催化材料的影响研究表明，尽管钙钛矿材料的价带能级低于噻吩类衍生物的氧化电位，但是钙钛矿与噻吩衍生物界面上的电荷转移效率却受阻于材料较高的激子结合能。CsPbI3催化噻吩衍生物聚合的界面电荷转移效率达到97%。钙钛矿材料光催化界面上的电荷转移效率是能级和能隙带双重作用的结果。此外，Cs3BixSb（2-x）Br9 反相蛋白石对3,4-乙烯二氧噻吩展现出了催化性能。研究结果为卤化钙钛矿材料通过光催化方法原位制备光电材料和器件提供支撑。