水相构筑CdTe基耗散体相p-i-n结太阳能电池及光物理过程研究

水溶液加工制备的CdTe基太阳能电池由于溶剂无毒及高的理论光电转化效率等特性，在光伏领域具有重要的应用前景。但较低的载流子迁移速率及有限的载流子寿命限制了CdTe厚度，严重制约了器件性能。基于p-n结原理的光伏器件中，p-i-n结及耗散体相异质结可以显著拓宽耗尽层宽度、提高载流子迁移速率、延长载流子寿命，因而，p-i-n结及耗散体相异质结的同步构筑有望协同增强光伏性能。本项目围绕水溶液加工制备的CdTe基太阳能电池中的两个限制因素：“载流子迁移速率低”、“载流子寿命短”，首次提出耗散体相p-i-n结太阳能电池的构筑，拟开展以下研究：（1）合成p型及n型载流子传输材料并进行基本表征；（2）构筑耗散体相p-i-n结太阳能电池并进行纳微结构及性能研究；（3）探索光物理过程，总结提升作用机理。从实验和理论上完善耗散体相p-i-n结模型，为制备高性能、溶剂无毒的太阳能电池提供科学依据。

Aqueous-processed CdTe based solar cells possess an important application prospect in the photovoltaic field due to their speciality of nontoxicity of solvent and high theoretical photoelectric conversion efficiency. However, the thickness of CdTe layer is suppressed by the low carrier mobility and lifetime, which seriously restrict their photovoltaic performance. In photovoltaic devices based on p-n junction principle, the p-i-n junction and depleted bulk heterojunction can significantly broaden the width of depletion region, improve the carrier mobility, prolong the carrier lifetime, therefore, the synchronous construction of p-i-n junction and depleted bulk heterojunction is expected to synergistically enhance the photovoltaic performance. Focusing on two limiting factors in aqueous-processed CdTe based solar cells: “low carrier mobility” and “short carrier lifetime”, this project proposes the construction of depleted bulk p-i-n junction solar cells for the first time, and plans to carry out the following studies: (1) synthesizing and characterizing the p-type and n-type carrier transport materials; (2) constructing the depleted bulk p-i-n junction solar cells and investigating their nano-microstructure and photovoltaic performance; (3) exploring the photophysical process and summarizing the mechanism of improvement. It is to improve the depleted bulk p-i-n junction model through experiment and theory to provide scientific basis for the preparation of high performance, solvent non-toxic solar cells.