Dyes and Pigments p. 146 - 154 (2015)
Update date:2022-08-10
Topics:
Zhu, Shengbo
An, Zhongwei
Chen, Xinbing
Chen, Pei
Liu, Qianfeng
A series of cyclic thiourea functionalized dyes containing binary π-linkers were synthesized and applied in the dye-sensitized solar cells. The only difference of these dyes is that one segment of the binary π-linkers is thiophene, n-hexylthiophene, thienothiophene, 3,4-ethylenedioxythiophene, and benzene, respectively. Among them, the dyes incorporating electron-rich thienothiophene or 3,4-ethylenedioxythiophene exhibit the broader absorption bands and higher molar extinction coefficients in the visible region, which can not only enhance the light-harvesting ability but also improve the short-circuit current density; on the other hand, the dyes bearing bulky n-hexylthiophene or 3,4-ethylenedioxythiophene can effectively suppress the intermolecular π-π aggregation and electron recombination owing to larger steric hindrance, which is beneficial to increase the open-circuit voltage.
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