2,3-Dipentyldithieno[3,2-f:2鈥?3鈥?h]quinoxaline-Based Organic Dyes for Efficient Dye-Sensitized Solar Cells: Effect of 蟺-Bridges and Electron Donors on Solar Cell Performance

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• 作者：Zu-Sheng Huang ; Xu-Feng Zang ; Tao Hua ; Lingyun Wang ; Herbert Meier ; Derong Cao
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：September 16, 2015
• 年：2015
• 卷：7
• 期：36
• 页码：20418-20429
• 全文大小：611K
• ISSN：1944-8252

文摘

Five novel metal-free organic dyes DQ1鈥? containing a dipentyldithieno[3,2-f:2鈥?3鈥?h]quinoxaline (DPQ) unit were synthesized and applied in dye-sensitized solar cells (DSSCs), where DPQ was employed as a 蟺-spacer for the first time. Their photophysical, electrochemical, and theoretical calculations and photovoltaic properties were systematically investigated. All the five dyes show broad photoresponse. Especially the absorption edges of DQ3鈥? extend to 800 nm on the TiO₂ films. The inserted electron-rich unit 3,4-ethylenedioxythiophene or electron-withdrawing group benzothiadiazole (BTD) in DPQ-based dyes can greatly influence the optoelectronic properties of the dyes. In addition, the different electron donors also significantly affect the performance of the DSSCs. Under standard global AM 1.5 solar light conditions, the DQ5 sensitized solar cell obtained a power conversion efficiency of 7.12%. The result indicates that the rigid DPQ-based organic dye is a promising candidate for efficient DSSCs.