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Photocurrent Enhancement of Hemicyanine Dyes Containing RSO3- Group through Treating TiO2 Films with Hydrochloric Acid
Abstract
Two kinds of hemicyanine dyes, 2-[4-(dimethylamino)styryl]benzothiazolium propylsulfonate (BTS) and 2-[4-(dimethylamino)styryl]-3,3-dimethylindolium propylsulfonate (IDS), were synthesized and characterized with respect to their UV−vis, fluorescence, and redox properties. Both dyes show outstanding properties for charge transfer on HCl-treated nanocrystalline TiO 2 films with near 100% incident monochromatic photon-to-electron conversion efficiency (IPCE) at the maximum absorption wavelength. This treatment was found to improve short-circuit photocurrent significantly, with increases by 99% and 329% for BTS and IDS, respectively. Overall yields were hence improved remarkably as a result of photocurrent enhancement: BTS increased by 66% from 3.1% to 5.1% and IDS increased by 260% from 1.3% to 4.8%. This phenomenon can be explained by the positive shift of flat band potential for TiO 2 and the increased amount of adsorbed dye molecules upon HCl treatment. The values for IPCE, short-circuit photocurrent, and overall solar energy to electricity conversion efficiency are all among the highest values respectively in the pure organic sensitizers reported so far.
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Self-citationPhotophysical and (Photo)electrochemical Properties of a Coumarin Dye
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Metadata
- Authors
- Wang, Z.-S., Li, F.-Y., & Huang, C.-H.
- Venue
- The Journal of Physical Chemistry B
- Publisher
- American Chemical Society (ACS)
- Published
- 2001-08-28
- Volume
- 105
- Issue
- 38
- Pages
- 9210-9217
- ISSN
- 1520-5207 (ISSN-L)
- 1520-6106
- OpenAlex
- W2072114528
- Cited by
- 163
- References
- 0
- FWCI
- 4.05
- Type
- journal article
- Language
- en
- Open access
- closed
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