期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 112, 期 22, 页码 8476-8480出版社
AMER CHEMICAL SOC
DOI: 10.1021/jp711689u
关键词
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资金
- National Research Foundation of Korea [핵06B1503, R01-2007-000-11075-0, 과C6A2003, R11-2005-048-05002-0] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
The surface of TiO2 photoelectrode was treated by dipping in nitric acid and subsequently coating with solar light absorbing dye. The influence of surface-modified photoelectrodes on the performance of dye-sensitized solar cells (DSCs) was investigated. The nitric acid treatment of the photoelectrode increased DSC energy conversion efficiency from 5.4 to 6.2%, which is mainly attributed to the increase in the photocurrent rather than the change in the open circuit voltage. The comparative studies were done using hydrochloric acid treated TiO2 photoelectrode. This demonstrates that the nitric acid treated photoelectrode retards back electron transfer at the interface with the electrolyte and increases the amount of adsorbed dyes. X-ray photoemission and Fourier transform infrared spectroscopy studies show that the effect of the nitric acid treatment is due to the presence of residual nitrate ions and hydroxyl groups which decrease free surface area and strengthens physical adsorption of dyes.
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