Optimization of porphyrin dyes with a bulky triphenylamine donor for developing efficient dye-sensitized solar cells

文献类型： 外文期刊

第一作者： Tang, Yunyu

作者： Tang, Yunyu;Kong, Cong;Wang, Yueqiang;Yan, Qifan;Zeng, Kaiwen;Xie, Yongshu;Wang, Yueqiang;Yan, Qifan;Zeng, Kaiwen;Xie, Yongshu;Tang, Weiqiang;Zhao, Shuangliang;Tang, Weiqiang;Zhao, Shuangliang;Zhao, Shuangliang;Zhao, Shuangliang

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关键词： Dye-sensitized solar cells; Porphyrin; Triphenylamine; Bulky groups; Cosensitization

期刊名称：DYES AND PIGMENTS （ 影响因子：4.889； 五年影响因子：4.016 ）

ISSN： 0143-7208

年卷期： 2021 年 187 卷

页码：

收录情况： SCI

摘要： To fabricate efficient dye-sensitized solar cells (DSSCs), three porphyrin dyes XW65-XW67 have been designed and synthesized using a bulky triphenylamine donor. Based on our previously reported dyes with a carbazole donor, a bulky triphenylamine unit was employed as the donor to synthesize XW65 with the aim to enhance the electron donating ability and suppress dye aggregation. As a result, XW65 shows enhanced photocurrent density (J(sc)) and open circuit voltage (V-oc ), affording a high efficiency of 9.02%. On this basis, XW66 was synthesized with a methyl group introduced into the carboxyphenyl acceptor to further suppress dye aggregation and improve the V-oc, achieving an enhanced efficiency of 9.23% with improved V-oc of 849 mV and J(sc) of 14.87 mA cm(-2), which can be ascribed to the further suppressed dye aggregation and enhanced adsorption amount on the TiO2 film induced by the additional methyl group. To further improve the J(sc), a benzothiadiazole (BTD) unit has been introduced as the auxiliary acceptor to afford XW67, which exhibits a strikingly red-shifted monochromatic photon-to-electron conversion efficiency (IPCE) onset wavelength of 830 nm, obtaining the highest J(sc) value of 15.83 mA cm(-2) among the three dyes. Consequently, despite the sacrifice of V-oc caused by the severe dye aggregation associated the extended conjugation framework, XW67 exhibits the highest efficiency of 9.43%. On this basis, cosensitization with WS-5 afforded elevated efficiencies of 10.07%, 10.38% and 10.13% for XW65-XW67, respectively, owing to the simultaneously enhanced J(sc) and V-oc. These results indicate that it is effective to develop efficient DSSCs based on cosensitization of optimized porphyrin dyes containing a bulky triphenylamine donor, a methyl group on the carboxyphenyl acceptor, and an auxiliary electron acceptor.

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