项目名称: 基于三维导电网格的染料敏化太阳能电池及其载流子传输机制研究
项目编号: No.51202138
项目类型: 青年科学基金项目
立项/批准年度: 2013
项目学科: 无机非金属材料学科
项目作者: 袁帅
作者单位: 上海大学
项目金额: 25万元
中文摘要: 如何改善染料敏化太阳能电池(DSC)的电荷传输过程是研究提高光电转换效率的重要课题。本项目拟通过n-型、p-型及pn-型DSC光电极、对电极的结构设计,提高光电子的收集效率进而改善光电转换效率。首先,采用反蛋白石结构氟掺杂氧化锡(FTO)为三维导电网格(3DCG)模型构造光电极和对电极,在光电极中利用FTO-3DCG收集TiO2中各方向的扩散电子(或NiO中各方向扩散的空穴),并将其快速传递到导电基底;而在对电极中,利用FTO-3DCG提高对电极与电解质的接触面积、增加Pt的催化活性位,改善电荷的传输。然后,通过微纳结构分析、电流密度-电压曲线谱、电子寿命谱、阻抗谱等,深入研究FTO-3DCG影响电子寿命、电池开路电压、短路电流、转换效率等性能的原因,深入理解影响DSC性能的关键因素-电荷传输与复合的过程和机理。本项目的成功实现将对DSC新型电极设计和性能提高具有重要的意义。
中文关键词: 染料敏化太阳能电池;导电网格;光电极;对电极;载流子传输
英文摘要: It is an important topic to optimize the charge transport process to improve the power conversion efficiency (PCE) of dye sensitized solar cells(DSC).We propose to improve the electron collection efficiency and PCE by designing new structured photoelectrodes and counter electrodes. Inverse opal structured fluorine-doped tin oxide (FTO) was chosen as the 3D conductive grid (3DCG) model. In photoelectrodes, FTO-3DCG can collect the diffusing electrons from TiO2 (or holes from NiO) efficiently, and transport them to the conductive substrate quickly. In the counter electrodes, FTO-3DCG can improve the interface area between counter electrode and electrolytes and load more Pt nanoparticles, improving the charge transport process. Combining the micro/nano structure analysis and Jsc-Voc, open-circuit photovoltage decay (OCVD), electrochemistry impedance spectroscopy (EIS), etc., the effects of FTO-3DCG on the electron lifetime, Voc, Jsc, PCE will be investigated in detail, which will be helpful for understanding the charge transport process and recombination process deeply. The research will be significant for designing new photoelectrode and improve the PCE.
英文关键词: dye sensitized solar cells;conductive grid;photoelectrode;counter electrode;charge transport