Red-Absorbing Cationic Acceptor Dyes for Photocathodes in Tandem Solar Cells
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- 作者：Christopher J. Wood ; Ming Cheng ; Charlotte A. Clark ; Raphael Horvath ; Ian P. Clark ; Michelle L. Hamilton ; Michael Towrie ; Michael W. George ; Licheng Sun ; Xichuan Yang ; Elizabeth A. Gibson
- 刊名：Journal of Physical Chemistry C
- 出版年：2014
- 出版时间：July 31, 2014
- 年：2014
- 卷：118
- 期：30
- 页码：16536-16546
- 全文大小：540K
- ISSN：1932-7455
文摘
A pair of new donor鈭捪€鈥揳cceptor dyes that absorb toward the red region of the visible spectrum (CAD 1 and CAD 2) utilizing indolium cationic acceptor units have been synthesized for use in p-type dye-sensitized solar cells (p-DSC). Their optical and electrochemical properties were determined experimentally, including application of ultrafast transient absorption and time-resolved infrared spectroscopies. Our results are supported by computational modeling. NiO-based p-DSCs with CAD 1 and CAD 2 gave short-circuit photocurrent densities of 3.6 and 3.3 mA鈥塩m鈥?, respectively, which are substantially higher than that of any previous red-absorbing p-DSC. These results are a step toward tandem dye-sensitized solar cells that absorb higher-energy photons at the TiO2 anode and lower-energy photons at the NiO cathode. Routes to further improve the efficiency of NiO DSCS are also discussed.