摘要
New imidazole-based organic dyes with two 2-cyanoacetic acid acceptors/anchors connected at the C-4 and C-5 positions, and a carbazole or arylamine donor connected at the C-2 position of the imidazole entity were synthesized and used as sensitizers for dye-sensitized solar cells. The dyes exhibit optical absorption from 300-600 nm with high molar extinction coefficients. The inclusion of a hexyl chain at the nitrogen atom of the imidazole was found to result in a large twist of the C-4 segment from the imidazole and, hence, to less efficient electron injection. Although dye aggregation results in light harvesting at longer wavelength regions, it also leads to excited-state quenching and hinders electron injection. Consequently, only moderate conversion efficiencies of DSSCs were achieved. Upon addition of CDCA coadsorbents, up to ca. 30 % improvement of the cell efficiency was achieved. The best cell efficiency reached 4.97 % with addition of 50 mM CDCA.
原文 | 英語 |
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頁(從 - 到) | 7367-7377 |
頁數 | 11 |
期刊 | European Journal of Organic Chemistry |
卷 | 2015 |
發行號 | 33 |
DOIs | |
出版狀態 | 已發佈 - 2015 11月 1 |
ASJC Scopus subject areas
- 物理與理論化學
- 有機化學