美人蕉花青素/N719染料共敏化太阳能电池性能

Dye-sensitised Solar Cell Performance with Co-sensitization of Canna Anthocyanin and N719

为了拓宽染料电池对太阳光谱的响应范围,提高光电转化效率,从天然植物美人蕉中提取了天然花青素染料,作为染料电池的共敏化剂。测试了花青素乙醇溶液的紫外-可见光谱,利用循环伏安法研究了它的氧化还原行为,并测试了其与N719共同敏化后的染料敏化太阳能电池的光学性能。结果表明:美人蕉花青素符合光敏染料的电子注入驱动力的要求;与N719的最优共敏化条件是花青素敏化60 min,N719敏化24 h。共敏化后电池光电压为0.8 V,短路电流密度为5.97 mA/cm2,填充因子F为0.55。光电转换效率为2.65%,比N719单独敏化提高了61%。说明美人蕉的花青素染料作为共敏化剂使用,能够拓展对太阳光谱的吸收范围,并且有助于提高染料电池性能。

In order to enlarge the response to sunlight spectrum and increase the conversion efficiency of photo to electricity, the natural anthocyanin dye was extracted from natural plant canna and was used as co-sensitizing agent of dye-sensitised solar cells. The UV-visible spectra of anthocyanin alcohol solution were tested, and its redox behavior was studied by cyclic vohammetry method. The optic performance of the cell after using co-sensitized dyestuff of N719 and anthoeyanin was determined. The results indicate that canna anthocyanin fits the requirements of the driving force for electrons;the optimum condition of co-sensitizing is that the sensitization time for canna anthocyanin is 60minutes, and for N719 is 24 hours. After cosensitation, the photovoltage of the cell is 0.8 V ,and its short circuit current is 5. 971mA/cm2. The fill factor F is 0.55. The photoelectricity conversion efficiency is 2.65% ,which is 61% higher than single N719. This experiment shows that canna anthocyanin can be used as a co-sensitizing agent to enlarge the absorbance to sunlight spectrum and improve the performance of dye-sensitised solar cell.