Thiophene-Bridged Double D-蟺-A Dye for Efficient Dye-Sensitized Solar Cell
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- 作者：Xiaoming Ren ; Shenghui Jiang ; Mingyang Cha ; Gang Zhou ; Zhong-Sheng Wang
- 刊名：Chemistry of Materials
- 出版年：2012
- 出版时间：September 11, 2012
- 年：2012
- 卷：24
- 期：17
- 页码：3493-3499
- 全文大小：342K
- 年卷期：v.24,no.17(September 11, 2012)
- ISSN：1520-5002
文摘
An organic dye containing two D-蟺-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-蟺-A analogue dye, the cross shape of the double D-蟺-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-蟺-A dye-based DSSC is 14-fold longer than that for the corresponding single D-蟺-A dye-based DSSC. Linking two D-蟺-A branches with a thiophene unit increases open-circuit photovoltage by 100 mV and short-circuit photocurrent by 4.10 mA cm鈥?. 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.