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 mA/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.
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