Influence of the Terminal Electron Donor in D鈥揇鈭捪€鈥揂 Organic Dye-Sensitized Solar Cells: Dithieno[3,2-b:2鈥?3鈥?d]pyrrole versus Bis(amine)

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• 作者：Panpan Dai ; Lin Yang ; Mao Liang ; Huanhuan Dong ; Peng Wang ; Chunyao Zhang ; Zhe Sun ; Song Xue
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：October 14, 2015
• 年：2015
• 卷：7
• 期：40
• 页码：22436-22447
• 全文大小：723K
• ISSN：1944-8252

文摘

With respect to the electron-withdrawing acceptors of D鈥揂鈭捪€鈥揂 organic dyes, reports on the second electron-donating donors for D鈥揇鈭捪€鈥揂 organic dyes are very limited. Both of the dyes have attracted significant attention in the field of dye-sensitized solar cells (DSCs). In this work, four new D鈥揇鈭捪€鈥揂 organic dyes with dithieno[3,2-b:2鈥?3鈥?d]pyrrole (DTP) or bis(amine) donor have been designed and synthesized for a investigation of the influence of the terminal electron donor in D鈥揇鈭捪€鈥揂 organic dye-sensitized solar cells. It is found that DTP is a promising building block as the terminal electron donor when introduced in the dithiophenepyrrole direction, but not just a good bridge, which exhibits several characteristics: (i) efficiently increasing the maximum molar absorption coefficient and extending the absorption bands; (ii) showing stronger charge transfer interaction as compared with the pyrrole direction; (iii) beneficial to photocurrent generation of DSCs employing cobalt electrolytes. DSCs based on M45 with the Co-phen electrolyte exhibit good light-to-electric energy conversion efficiencies as high as 9.02%, with a short circuit current density (J_SC) of 15.3 mA cm^鈥?, open circuit voltage (V_OC) of 867 mV and fill factor (FF) of 0.68 under AM 1.5 illumination (100 mW cm^鈥?). The results demonstrate that N,S-heterocycles such as DTP unit could be promising candidates for application in highly efficient DSCs employing cobalt electrolyte.