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

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 o...

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Bibliographic Details
Published in:ACS applied materials & interfaces 2012-09, Vol.4 (9), p.4566-4570
Main Authors: Ghosh, Rudresh, Hara, Yukihiro, Alibabaei, Leila, Hanson, Kenneth, Rangan, Sylvie, Bartynski, Robert, Meyer, Thomas J, Lopez, Rene
Format: Article
Language:English
Subjects:
Coloring Agents - chemistry
Dielectric Spectroscopy
Electric Power Supplies
Lasers
Metal Nanoparticles - chemistry
Solar Energy
Tantalum - chemistry
Titanium - chemistry
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Summary: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–Schottky 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.
ISSN:1944-8244
1944-8252
DOI:10.1021/am300938g