Triphenylamine-thienylenevinylene hybrid systems with internal charge transfer as donor materials for heterojunction solar cells
Triphenylamine-thienylenevinylene hybrid systems with internal charge transfer as donor materials for heterojunction solar cells
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DOI：
10.1021/ja058178e
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发表时间：
2006-03-15
影响因子：
15
通讯作者：
Roncali, J
中科院分区：
文献类型：
--
作者：
Roquet, S;Cravino, A;Roncali, J
本文合成了以三苯胺为核，由噻吩亚乙烯基共轭支链和吸电子茚二酮或二氰基乙烯基的各种组合衍生的星形分子。紫外-可见吸收和荧光发射数据表明，电子受体基团的引入诱导分子内电荷转移，导致吸收开始向更长的波长和猝灭的光致发光的移位。循环伏安法表明，所有化合物都呈现可逆的第一氧化过程，其电位随着结构中吸电子基团的数目而增加。原型体和双层异质结太阳能电池已实现使用富勒烯C-60衍生物作为受体材料。结果表明，在施主结构中引入电子-受体基团后，器件在可见光区的光响应范围扩大，最大外量子效率提高，在白色光照射下的开路电压增大.这些协同效应允许在100 mW cm（-2）的模拟AM 1.5太阳照射下达到类似于1.20%的功率转换效率。
Star-shaped molecules based on a triphenylamine core derivatized with various combinations of thienylenevinylene conjugated branches and electron-withdrawing indanedione or dicyanovinyl groups have been synthesized. UV-vis absorption and fluorescence emission data show that the introduction of the electron-acceptor groups induces an intramolecular charge transfer that results in a shift of the absorption onset toward longer wavelengths and a quenching of photoluminescence. Cyclic voltammetry shows that all compounds present a reversible first oxidation process whose potential increases with the number of electron-withdrawing groups in the structure. Prototype bulk and bilayer heterojunction solar cells have been realized using fullerene C-60 derivatives as acceptor material. The results obtained with both kinds of devices show that the introduction of electron-acceptor groups in the donor structure induces an extension of the photoresponse in the visible spectral region, an increase of the maximum external quantum efficiency, and an increase of the open-circuit voltage under white light illumination. These synergistic effects allow reaching power conversion efficiencies of similar to 1.20% under simulated AM 1.5 solar irradiation at 100 mW cm(-2).