本文分别以三苯胺、二甲基苯胺和吲哚啉单元为电子给体,设计并合成了3个新型D-π-A体系近红外敏化染料分子5C-1、5C-2和5C-3,并对其结构进行了表征,详细研究了在溶液中以及吸附到电极上的吸收光谱. 该系列敏化染料在550-850 nm之间具有较强的吸收,尤其5C-3的吸收边带已达到954 nm. 当该系列敏化染料吸附到TiO_2上时,吸收边带大幅红移,显示有利于染料捕获长波段区域的太阳光. 通过循环伏安法,测定了染料的电化学性质,发现该系列敏化染料的最低未占有轨道(LUMO)能级与TiO_2导带并不匹配,因此选用导带能级更正的SnO_2作为阳极半导体材料进一步测试了该系列染料的光电性能,以发展具有优良性能的长波段响应的近红外敏化剂.
A series of novel NIR dyes 5C-1, 5C-2 and 5C-3 containing triphenylamine, dimethylphenylamine and indoline unit as electron donors were synthesized and characterized. Their photophysical and electrochemical properties were studied in detail. All of three dyes have strong absorption in visible and NIR region from 550 to 850 nm. While adsorbed on TiO_2, absorption peaks become broadened with red-shift in their absorption edges, which are favored to capture light in NIR region. However, LUMO levels of these NIR dyes are above -0.1 V vs NHE, incapable of matching the conduction band of TiO_2 (-0.5 V vs NHE). Therefore, SnO_2 was utilized as anodic semiconductor materials instead of TiO_2. The short-circuit current density was sharply increased, indicating that using a suitable semiconductor material could improve light-generated current effectively. The photovoltaic performance of DSSCs based on three dyes could be further improved after optimizing the semiconductor materials and the electrolyte.
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