Molecular Engineering of Potent Sensitizers for Very Efficient Light Harvesting in Thin-Film Solid-State Dye-Sensitized Solar Cells

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• 作者：Xiaoyu Zhang ; Yaoyao Xu ; Fabrizio Giordano ; Marcel Schreier ; Norman Pellet ; Yue Hu ; Chenyi Yi ; Neil Robertson ; Jianli Hua ; Shaik M. Zakeeruddin ; He Tian ; Michael Grätzel
• 刊名：Journal of the American Chemical Society
• 出版年：2016
• 出版时间：August 31, 2016
• 年：2016
• 卷：138
• 期：34
• 页码：10742-10745
• 全文大小：320K
• 年卷期：0
• ISSN：1520-5126

文摘

Dye-sensitized solar cells (DSSCs) have shown significant potential for indoor and building-integrated photovoltaic applications. Herein we present three new D–A−π–A organic sensitizers, XY1, XY2, and XY3, that exhibit high molar extinction coefficients and a broad absorption range. Molecular modifications of these dyes, featuring a benzothiadiazole (BTZ) auxiliary acceptor, were achieved by introducing a thiophene heterocycle as well as by shifting the position of BTZ on the conjugated bridge. The ensuing high molar absorption coefficients enabled the fabrication of highly efficient thin-film solid-state DSSCs with only 1.3 μm mesoporous TiO₂ layer. XY2 with a molar extinction coefficient of 6.66 × 10⁴ M^–1 cm^–1 at 578 nm led to the best photovoltaic performance of 7.51%.