Light absorption efficiencies of photoactive multilayered films: a realistic approach for porous materials

In the present work the authors report a methodology to obtain an accurate calculation of the light absorption efficiency of hybrid photoactive layers. The photoactive layer (PAL) is a semiconductor matrix doped with a molecular species. The chosen matrix was TiO 2 prepared either by sputtering or b...

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Bibliographic Details
Published in:Solar energy materials and solar cells 2005-08, Vol.88 (3), p.301-314
Main Authors: Viseu, T.M.R., Ferreira, M.I.C.
Format: Article
Language:English
Subjects:
Applied sciences
Energy
Exact sciences and technology
Hybrid layer
Light absorption efficiency
Natural energy
Nile red
Photoactive layer
Photovoltaic conversion
Porphyrin
Solar cells. Photoelectrochemical cells
Solar energy
TiO 2
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Summary:In the present work the authors report a methodology to obtain an accurate calculation of the light absorption efficiency of hybrid photoactive layers. The photoactive layer (PAL) is a semiconductor matrix doped with a molecular species. The chosen matrix was TiO 2 prepared either by sputtering or by sol–gel techniques. Zinc meso-tetraphenylporphyrin and Nile red were selected as light absorbing dopants due to their absorption spectra for solar light. The proposed methodology takes into account a detailed optical characterization of each PAL where the morphology and the porosity of the semiconductor matrix are considered. The role of direct excitation of the semiconductor could also be discriminated. Moreover, the method allows an accurate estimate of the effective light absorption efficiency of complex multilayered materials from the optical characterization of each layer separately.
ISSN:0927-0248
1879-3398
DOI:10.1016/j.solmat.2004.11.004