title: Low-temperature UV processing of nanoporous SnO₂ layers for dye-sensitized solar cells.
abstract: Connection of SnO₂ particles by simple UV irradiation in air yielded cassiterite SnO₂ porous films at low temperature. XPS, FTIR, and TGA-MS data revealed that the UV treatment has actually removed most of the organics present in the precursor SnO₂ colloid and gave more hydroxylated materials than calcination at high temperature. As electrodes for dye-sensitized solar cells (DSCs), the N3-modified 1-5 μm thick SnO₂ films showed excellent photovoltaic responses with overall power conversion efficiency reaching 2.27% under AM1.5G illumination (100 mW cm⁻²). These performances outperformed those of similar layers calcined at 450 °C mostly due to higher V(oc) and FF. These findings were rationalized in terms of slower recombination rates for the UV-processed films on the basis of dark current analysis, photovoltage decay, and electrical impedance spectroscopy studies.
authors: University of Bordeaux 1, Institut des Sciences Moléculaires, Groupe C2M, UMR 5255 CNRS, 351 Cours de la Libération, F-33405 Talence Cedex, France.
authors: Zoe
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authors: Tebby
authors: Tamez
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authors: Uddin
authors: Yohann
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authors: Nicolas
authors: Céline
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authors: Olivier
authors: Thierry
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authors: Toupance
authors: Christine
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authors: Labrugère
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authors: Hirsch