染料敏化太阳能电池中花青素与β-胡萝卜素天然染料共敏化的研究

Study on Anthocyanin and β-Carotene Natural Dye Co-sensitization in Dye Sensitized Solar Cell

从高原格桑花和胡萝卜中提取天然染料花青素和β-胡萝卜素作为敏化剂,并组装染料敏化太阳能电池(DSC)。研究了提取的天然染料的光吸收性能、主要成分和共敏化方式,讨论了花青素和β-胡萝卜素的共敏化形式、比例、浓度和时间对DSC光电性能的影响。研究发现,花青素和β-胡萝卜素混合敏化时表现出明显的共敏化作用,而分层敏化时则共敏效果不明显。当花青素含量逐渐降低时,共敏化电池的短路电流和光电转换效率表现出先增大后减小的趋势,且共敏化的最佳体积比为1∶1,同时发现共敏化时间比通常少很多,最佳敏化时间为15min。最佳共敏化条件下组装的DSC的短路电流密度为0.725 m A/cm2,光电转换效率为0.267%,相比于花青素和β-胡萝卜素单独敏化时组装的DSC,短路电流分别提高了60%和505%,光电转换效率分别提高了51%和480%,这主要得益于共敏化后拓宽的光谱吸收范围。

Natural dyes of anthocyanin and β-carotene were extracted from garden cosmos and carrots,respectively,which were then incorporated into dye sensitized solar cells（ DSC）. The light absorption properties,main components and the methods of co-sensitization of the two natural dyes were studied.The results show that mixed sensitizing of anthocyanin and β-carotene exhibits co-sensitized effect,while layered sensitizing not. The short-circuit current density and the power conversion efficiency of the cosensitized solar cell first increases and then decreases as the the anthocyanin content gradually decreasing,the best volume ratio of co-sensitization is 1 ∶ 1. At the same time, the optimal cosensitization time is 15 min,which is much less than usual. The short-circuit current density of cosensitized solar cells under the optimized condition is 0. 725 m A / cm2,increased by 60% and 505%compared with that of anthocyanin and β-carotene sensitized solar cells. The photoelectric conversionefficiency of co-sensitized solar cells was 0. 267%,increased by 51% and 480% compared with that of anthocyanin and β-carotene sensitized solar cells. The increase of photoelectric conversion efficiency of co-sensitized solar cells benefited from the broadened range of spectral absorption.