不同受体结构染料共敏化对染料敏化太阳电池性能的影响

为了拓宽染料敏化太阳电池对太阳光谱的响应范围，提高电池的光电转换效率，将两种含有不同受体结构（绕丹宁-3-乙酸基（RA）和氰基丙烯酸基（CA））的三苯胺染料（TR1和TC1）进行共敏化。TR1染料平伏吸附在TiO₂表面，而TC1染料直立吸附在TiO₂表面。将两种染料按照不同摩尔比共敏化TiO₂后，TC1占据TR1的部分位置，拓展光谱的同时也抑制了电荷复合，电子寿命较TR1敏化的太阳电池长。在TR1与TC1摩尔比为5：5的共敏剂溶液敏化的共敏电池器件中，短路光电流密度（J_sc）为11.7 mA/cm²，开路电压（V_oc）为704 mV，填充因子（FF）为0.73，光电转换效率（η）为6.03%。该结果明显优于单一染料敏化的电池器件。

Effect of Co-sensitization of Dyes with Different Acceptor Moieties for Dye-sensitized Solar Cells

In order to broaden the response range of dye-sensitized solar cells to the solar spectrum and improve the photovoltaic performance of the cells, two triphenylamine dyes (TR1 and TC1) containing different acceptor moieties (rhodanine-3-acetic acid (RA) and cyanoacrylic acid (CA)) were co-sensitized. The TR1 dyes adsorbed on TiO₂ surface with a lied down mode, while the TC1 dyes with a standing adsorption mode. When the two dyes were co-sensitized on TiO₂ in different molar ratios, TC1 would occupy part of the positions of TR1, which could expand the spectrum and inhibit the charge recombination at the same time. The electron lifetime of the co-sensitized solar cell device was longer than that of TR1-sensitized solar cell. Finally, the co-sensitized device sensitized by co-sensitizer solution in which the molar ratio of TR1 to TC1 is 5:5 yielded short-circuit photocurrent density (J_sc) of 11.7 mA/cm², open circuit voltage (V_oc) of 704 mV, fill factor (FF) of 0.73 and the highest efficiency of 6.03%. This performance is superior to those of solar cell devices sensitized by the two dyes individually.