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Influence of nitrogen dopants on N-doped TiO2 electrodes and their applications in dye-sensitized solar cells
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Physical and Analytical Chemistry, Physical Chemistry.
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Physical and Analytical Chemistry, Physical Chemistry.
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2011 (English)In: Electrochimica Acta, ISSN 0013-4686, E-ISSN 1873-3859, Vol. 56, no 12, 4611-4617 p.Article in journal (Refereed) Published
Abstract [en]

Three different types of nanocrystalline, N-doped TiO2 electrodes were synthesized using several nitrogen dopants through wet methods. The obtained nanocrystalline, N-doped TiO2 electrodes possessed different crystallite sizes, surface areas, and N-doping amounts. Characterizations were performed to reveal the nitrogen-doping processes for the wet methods using ammonia, urea, and triethylamine as the nitrogen dopants. Additionally, a high conversion efficiency of 8.32% was achieved by the dye-sensitized solar cells, based on the N-doped TiO2 electrodes. For instance, in comparison with the commercial P25 (5.76%) and pure anatase TiO2 electrodes (7.14%), significant improvements (44% and 17%, respectively) in the efficiencies were obtained. The findings also indicated that the ammonia nitrogen dopant was more efficient than other two nitrogen dopants. The electron transports, electron lifetimes, and charge recombination in the dye-sensitized N-doped TiO2 solar cells also differed from those in the pure TiO2-based dye-sensitized solar cells (DSCs). Specifically, an enhanced photocurrent of ca. 36% in N-doped DSCs resulted from the synergistic effects of the high dye uptake and the efficient electron transport. Moreover, the relationship between charge and voltage revealed that less charge was needed to get a high open-circuit voltage in the N-doping films.

Place, publisher, year, edition, pages
2011. Vol. 56, no 12, 4611-4617 p.
Keyword [en]
Nitrogen-doped titania, Dye-sensitized solar cell, Nitrogen dopant, Wet method, Electron transport
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-154613DOI: 10.1016/j.electacta.2011.02.091ISI: 000290701500028OAI: oai:DiVA.org:uu-154613DiVA: diva2:421551
Available from: 2011-06-09 Created: 2011-06-08 Last updated: 2017-12-11Bibliographically approved

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Boschloo, GerritHagfeldt, Anders

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