Increasing Photocurrents in Dye Sensitized Solar Cells with Tantalum-Doped Titanium Oxide Photoanodes Obtained by Laser Ablation

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• 作者：Rudresh Ghosh ; Yukihiro Hara ; Leila Alibabaei ; Kenneth Hanson ; Sylvie Rangan ; Robert Bartynski ; Thomas J. Meyer ; Rene Lopez
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2012
• 出版时间：September 26, 2012
• 年：2012
• 卷：4
• 期：9
• 页码：4566-4570
• 全文大小：323K
• 年卷期：v.4,no.9(September 26, 2012)
• ISSN：1944-8252

文摘

Laser ablation is employed to produce vertically aligned nanostructured films of undoped and tantalum-doped TiO₂ nanoparticles. Dye-sensitized solar cells using the two different materials are compared. Tantalum-doped TiO₂ photoanode show 65% increase in photocurrents and around 39% improvement in overall cell efficiency compared to undoped TiO₂. Electrochemical impedance spectroscopy, Mott鈥揝chottky analysis and open circuit voltage decay is used to investigate the cause of this improved performance. The enhanced performance is attributed to a combination of increased electron concentration in the semiconductor and a reduced electron recombination rate.

Keywords:

dye sensitized solar cells; pulsed laser deposition; tantalum-doped titanium oxide; emerging photovoltaics; photocurrent; electrochemical impedance spectroscopy