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Organic Photosensitizers Incorporating Rigidified Dithieno[3,2-f:2′,3′-h]quinoxaline Segment Tethered with Thiophene Substitutes for Dye-Sensitized Solar Cells
- Ni, Jen-Shyang, Chiu, Tang-Yao, Kao, Wei-Siang, Chou, Hao-Ju, Su, Chao-chin, Lin, Jiann T.
- ACS Applied Materials & Interfaces 2016 v.8 no.35 pp. 23066-23073
- absorption, dyes, electrolytes, lighting, photosensitizing agents, photovoltaic cells, thiophene
- Metal-free D−π–RS−π–A type sensitizers, consisting of triphenylamine as the electron donor, 2,3-bis(3-(2-ethylhexyl)-5-methylthiophen-2-yl)dithieno[3,2-f:2′,3′-h]quinoxaline (DTQT) as the rigidified conjugation spacer (RS), thiophene as the π-spacer, and 2-cyanoacrylic acid as the acceptor/anchor, have broad absorption spectra ranging from 350 to 550 nm and a high molar extinction coefficient up to >46 200 M–¹ cm–¹. Under simulated AM 1.5 G illumination, the dye-sensitized solar cells (DSSCs) fabricated from the dyes exhibited light-to-electricity conversions in the range of 6.78% to 8.27%. The best efficiency is slightly higher than that of N719-based standard DSSC (7.92%). The efficiency can be further boosted to 8.51% by optimizing the concentration of LiI electrolyte.