Organic Photosensitizers Incorporating Rigidified Dithieno­[3,2‑f:2′,3′‑h]­quinoxaline Segment Tethered with Thiophene Substitutes for Dye-Sensitized Solar Cells

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/anc...

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Bibliographic Details
Published in:ACS applied materials & interfaces 2016-09, Vol.8 (35), p.23066-23073
Main Authors: Ni, Jen-Shyang, Chiu, Tang-Yao, Kao, Wei-Siang, Chou, Hao-Ju, Su, Chao-chin, Lin, Jiann T
Format: Article
Language:English
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Summary: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.
ISSN:1944-8244
1944-8252
DOI:10.1021/acsami.6b07346