Thiophene-Bridged Double D‑π‑A Dye for Efficient Dye-Sensitized Solar Cell

An organic dye containing two D-π-A branches linked with a thiophene unit has been designed and synthesized for efficient dye-sensitized solar cells (DSSCs). As compared to the rod-shape of the single D-π-A analogue dye, the cross shape of the double D-π-A branched dye is favorable for reducing inte...

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Bibliographic Details
Published in:Chemistry of materials 2012-09, Vol.24 (17), p.3493-3499
Main Authors: Ren, Xiaoming, Jiang, Shenghui, Cha, Mingyang, Zhou, Gang, Wang, Zhong-Sheng
Format: Article
Language:English
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Summary:An organic dye containing two D-π-A branches linked with a thiophene unit has been designed and synthesized for efficient dye-sensitized solar cells (DSSCs). As compared to the rod-shape of the single D-π-A analogue dye, the cross shape of the double D-π-A branched dye is favorable for reducing intermolecular interaction and retarding charge recombination. Controlled intensity modulated photovoltage spectroscopy reveals that electron lifetime for the double D-π-A dye-based DSSC is 14-fold longer than that for the corresponding single D-π-A dye-based DSSC. Linking two D-π-A branches with a thiophene unit increases open-circuit photovoltage by 100 mV and short-circuit photocurrent by 4.10 mA cm–2. As a consequence, power conversion efficiency is enhanced by about 2-fold. This work presents a new route to designing sensitizers with high suppression ability of charge recombination toward high-performance DSSCs.
ISSN:0897-4756
1520-5002
DOI:10.1021/cm302250y