Novel organic dyes incorporating a carbazole or dendritic 3,6-diiodocarbazole unit for efficient dye-sensitized solar cells

Novel organic dyes incorporating a carbazole or dendritic 3,6-diiodocarbazole unit for efficient dye-sensitized solar cells
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新型有机染料包含咔唑或树枝状 3,6-二碘咔唑单元,用于高效染料敏化太阳能电池

DOI:
10.1016/j.dyepig.2013.09.025
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发表时间:
2014
期刊:
影响因子:
4.5
通讯作者:
Su Cheng-Yong
Su Cheng-Yong
中科院分区:
材料科学2区
文献类型:
--
作者:
Tan Li-Lin;Xie Li-Jun;Shen Yong;Liu Jun-Min;Xiao Li-Min;Kuang Dai-Bin;Su Cheng-Yong

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合成了四种以咔唑或3,6-二碘咔唑单元为电子给体、苯/噻吩或低聚噻吩部分为共轭间隔基、2-氰基丙烯酸为电子受体的有机光敏剂。光伏性能数据对敏化剂的结构修饰相当敏感。苯/噻吩连接基的引入有利于降低聚集倾向,但不利于供体和受体之间的电子传递。在桥中添加噻吩单元有效地使吸收响应红移,然而,有机染料具有一些π-π聚集。引入3,6-二碘咔唑作为树枝状给体单元不仅提高了吸收的摩尔消光系数,而且抑制了电荷与电解质的复合。
Four organic photosensitizers incorporating a carbazole or 3,6-diiodocarbazole unit as the electron donor, a benzene/thiophene or oligothiophene moiety as the conjugated spacer, and 2-cyanoacrylic acid as the electron acceptor have been synthesized. The photovoltaic performance data are quite sensitive to the structural modification of sensitizer. The introduction of the benzene/thiophene linker benefits from lower tendency to aggregate, but disfavors the electron transport between donor and acceptor. The addition of a thiophene unit in the bridge efficiently red-shifts the absorption response, however, organic dyes have some π–π aggregation. Incorporation of 3,6-diiodocarbazole as a dendritic donor unit not only enhances the molar extinction coefficients of the absorption but also suppresses the charge recombination with electrolyte.
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