高原天然染料敏化剂的提纯、改性和共敏化的研究

本研究利用青藏高原植物受光照时间长、因而色素含量多的优势，研究高原天然染料的提纯、改性和共敏化对染料成分、分子结构、光谱响应范围等的影响,以及对染料敏化太阳能电池的光电性能影响。首先研究提取条件，如温度、时间、溶剂、pH值等对提取成分和染料溶解性的影响，研究多次萃取、层析等对染料纯度的影响。其次，研究改性试剂、催化剂，添加量，反应时间、温度等对染料敏化剂结构、吸附量、量子效率以及对电池光电性能的影响。最后研究染料敏化剂的成分、比例、溶剂、吸附顺序等对共敏化染料吸附量、光谱响应范围以及对电池光电性能的影响。获得两种以上具有合适光谱响应范围和良好溶解性的高原天然染料敏化剂。获得具有良好吸附量和量子效率的改性高原天然染料敏化剂。获得具有宽光谱响应范围的共敏化染料。敏化剂改性后的DSC光电转换效率比改性前提高10%以上。与N719共敏化的DSC光电转换效率比共敏化之前提高20%以上。

Regarding to the advantages of high concentrations of dye molecules for the plants in high altitude of plateau due to their long sunshine time, this project aims at exploring plateau nature dyes used in dye sensitized solar cells (DSC) with high efficiency. We will investigate how the purification, modification and co-sensitization methods influence the dye composition, the molecule structure, the spectral response range, and thus the photovoltaic performance of the devices. Firstly, as for purification method, the influences of the purification conditions (such as temperature, time, solvent, pH value and so on) on the extracted composition and the dye solubility will be studied, coupled with how the processes of repeated extraction and chromatography affect the dye purity. Secondly, as for the modification method, research on the optimization of modification chemicals, catalyst, addition amount, reaction time, and temperature judging by the sensitizer structure, adsorption amount, IPCE and the photovoltaic performance will be carried out. Finally, as for co-sensitization method, we will study how the dye loading amount, spectral response range, and cell performance depend on the sensitizers' compositions, their proportion, the solvent, and sensitization sequence. After these efforts, we expect to obtain at least two kinds of plateau nature dyes with suitable spectral response range and good solubility, which will be further improved for their adsorption property and IPCE after molecule modification. Specifically, the overall cell efficiency will be enhanced by 10% after molecule modification, and further increased by 20% after co-sensitization.