21种天然植物染料光敏剂的光电性能

Application of 21 natural dyes as sensitizers for dye sensitized solar cells

从6系列天然植物的花、叶、果壳、果实等部位提取了21种天然染料，着重分析了作为染料敏化太阳电池（DSCs）光敏剂的光电性能。结果表明，不同类型天然染料敏化的DSCs的光电性能差异较大，短路电流、开路电压、填充因子和转换效率分别在0．245～1．441mA／cm2、0．327—0．546V、0．362—0．585和0．029％-0．46％之间变化。转换效率和短路电流成明显的直线关系，斜率为0．32。在21种天然染料中，紫色系山竹皮提取液的四个光电性能参数均最大，而黑色系黑芝麻提取液的四个光电性能参数均最小。前者高效的主要原因在于较强的可见光吸收以及与光电极TiO2表面形成稳定的化学吸附。

Twenty-one natural dyes, which were extracted from natural plant materials such as dragon fruit pericarp, ginger, black fungus, camphor leaf and chestnut shell, were used as sensitizers for dye sensitized solar cells （DSCs）. The photoelectrical properties of DSCs based on these natural dyes are evident differences： the short-circuit current density varies from 0.245- 1.441 mA/cm2, the open-circuit voltage ranges from 0.327-0.546 V, the fill factor changes from 0.362-0.585, and the efficiency varies from 0.029%-0.46%. The efficiency and short-circuit current density data from these DSCs shows a linear relation with a slope of 0.32 in value, which means efficiency has a very close connection with short-circuit current density. Among these natural dyes based DSCs, mangosteen pericarp extract based DSCs has the best photoelectdcal property parameters whereas black sesame extract based DSCs has the worst. The higher efficiency of the former is mainly contributed to strong sunlight absorption and stable bonding between dye molecule and TiO2 particles.