聚合物太阳电池中自由电荷产生过程的机理研究

项目名称： 聚合物太阳电池中自由电荷产生过程的机理研究

项目编号： No.11274142

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 数理科学和化学

项目作者： 张汉壮

作者单位： 吉林大学

项目金额： 90万元

中文摘要： 聚合物太阳电池中自由电荷的产率决定了电池的外量子效率和短路光电流等器件的特性，因此深入理解自由电荷的产生机理对提高太阳电池的能量转化效率至关重要。由于自由电荷的产生是一种包含了激子解离、电荷复合等多种过程在内，并依赖于材料的结构和微尺度形貌的复杂超快动力学过程，致使人们至今未能明晰其机理，并实现有效地调控。本项目以宽吸收光谱的聚合物/富勒烯异质结为研究对象，以飞秒瞬态吸收光谱为研究手段，研究异质结内自由电荷的产生过程，以及自由电荷的产率与载流子浓度之间的关系，为深入理解器件服役条件下的光电特性奠定基础。本项研究的预期成果不仅可以刻画复杂条件下电荷产生的物理图像，而且可以为今后材料和器件的设计提供实验依据和理论支持。

中文关键词： 聚合物太阳电池；激子解离；电荷转移；超快光谱；泵浦-探测

英文摘要： The yield of free charge in polymer solar cell determines device performance, such as the external quantum efficiency, short current, etc, so understanding the generation mechanism of free charge is important for increasing the energy conversion efficiency of solar cell. Since the generation of free charge is a so complex ultrafast kinetic process, which involves many more processes such as exciton dissociation, charge recombination, etc, and depends on the structure and the nanoscale morphology of material, that people isn't able to clarify its mechanism and control it efficiently, up to now. In this project, we choose the heterojunction composed of polymer with broad absorption spectrum and fullerene as investigation object, focus on the free charge generation processes in heterojunction and the relationship between the yield of free charge and the carrier concentration by using femtosecond transient absorption spectroscopy,and lay the fundation for further understanding the photoelectric properties of working device. The prospective production of this project could not only resolve the physical image of charge generation under complex condition, but also offer the experimental evidence and theoretical support of design of material and imporvement of device in the future.

英文关键词： polymer solar cell；exciton dissociation；charge transfer；ultrafast spectroscopy；pump-probe