Organic dyes incorporating the cyclopentadithiophene moiety for efficient dye-sensitized solar cells

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• 作者：Xiaobing  ; Cheng ; Siyuan  ; Sun ; Mao  ; Liang  ; ;   ; ^{liangmao717@126.com} ; Yongbo  ; Shi ; Zhe  ; Sun ; Song  ; Xue  ; ;   ; ^{xuesong@ustc.edu.cn}
• 关键词：Dye-sensitized solar cell ; Organic dye ; Triarylamine ; Cyclopentadithiophene ; Conjugated bridge ; Photovoltaic
• 刊名：Dyes and Pigments
• 出版年：2012
• 出版时间：March 2012
• 年：2012
• 卷：92
• 期：3
• 页码：1292-1299
• 全文大小：853 K

文摘

Three triarylamine organic dyes (XS28?0) containing a cyclopentadithiophene unit as the conjugated bridge have been designed and synthesized for a potential application in dye-sensitized solar cells (DSSCs). Their absorption spectra, electrochemical and photovoltaic properties have been investigated. The incorporation of ethyl-substituted cyclopentadithiophene is highly beneficial to light-harvesting and preventing close ¦Ð¨C¦Ð aggregation, thus favorably generating high efficiency. For a typical device, a solar energy conversion efficiency (¦Ç) of 5.8 % based on XS29 was achieved under simulated AM 1.5 solar irradiation (100 mW cm^?) with a short-circuit photocurrent density (J_SC) of 14.4 mA cm^?, an open-circuit voltage (V_OC) of 601 mV, and a fill factor (ff) of 0.68. These results suggest that the functionalized cyclopentadithiophene unit is a promising candidate for DSSCs.