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Highly efficient dye-sensitized solar cells based on nitrogen-doped titania with excellent stability
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Physical and Analytical Chemistry, Physical Chemistry.
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2011 (English)In: Journal of Photochemistry and Photobiology A: Chemistry, ISSN 1010-6030, Vol. 219, no 2-3, 180-187 p.Article in journal (Refereed) Published
Abstract [en]

A series of nitrogen-doped and undoped TiO2 nanocrystals was prepared by several simple methods. Needle-like N-doped TiO2 nanocrystals and nanoparticles were obtained from commercial TiO2 powders. Several dye-sensitized solar cells (DSCs) were fabricated based on N-doped and undoped TiO2 electrodes. The N-doped DSCs achieved a high conversion efficiency of 10.1% and 4.8% using an organic electrolyte and an ionic liquid electrolyte, respectively. Systemic investigations were carried out on the properties of N-doped and undoped TiO2 powders, films, and DSCs. The electron transport time and electron lifetime were investigated by intensity-modulated photocurrent and photovoltage spectroscopy (IMPS/IMVS). Moreover, the electron injection of N-doped DSCs was studied by surface photovoltage spectroscopy (SPS). The synergetic effect of higher dye uptake, faster electron transport and higher photovoltage contributes to a higher conversion efficiency of N-doped DSCs. The stability test also demonstrated that the photodegradation of the DSCs was not accelerated and the DSC system was stabilized by the introduction of nitrogen into the TiO2 photoelectrode. These results indicate that the N-doped TiO2 nanocrystals prepared by our approach from commercial TiO2 are ideal semiconductor materials for DSCs.

Place, publisher, year, edition, pages
2011. Vol. 219, no 2-3, 180-187 p.
Keyword [en]
N-doped titania, Dye-sensitized solar cell, Electron transport, Photovoltaic performance
National Category
Chemical Sciences
URN: urn:nbn:se:uu:diva-154542DOI: 10.1016/j.jphotochem.2011.01.004ISI: 000290882500002OAI: oai:DiVA.org:uu-154542DiVA: diva2:420988
Available from: 2011-06-07 Created: 2011-06-07 Last updated: 2012-12-06Bibliographically approved

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Boschloo, GerritHagfeldt, Anders
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