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- Title
Nitrogen-doped submicron-size TiO particles as bifunctional light scatterers in dye-sensitized solar cells.
- Authors
Shogh, Shiva; Mohammadpour, Raheleh; Iraji zad, Azam; Taghavinia, Nima
- Abstract
The structural, electrical, optical, and photovoltaic properties of aggregated submicron nitrogen-doped TiO particles (NTiO) and the influence of utilizing them, in comparison with undoped ones, as the light-scattering layer of dye-sensitized solar cells were investigated. Field emission scanning electron microscope, X-ray diffraction, and diffuse reflectance spectra showed that both type samples have similar morphology, crystal phase, and scattering feature. Moreover, photoluminescence, Mott-Schottkey, and photovoltaic characteristics such as IMPS/IMVS and charge extraction analysis indicated that the NTiO layer is an efficient scatterer in two aspects: enhancement of light-harvesting efficiency by having submicron-size centers and modification of the electrical properties such as charge collection efficiency in photoanode. As a result, the overall conversion efficiency reached 7.34 % upon employing NTiO as the light-scattering layer, which is 13 % higher than undoped one. This improvement is a consequence of trap density reduction, electrons transfer enhancement in the interface of photoactive/scattering layer, and shunt resistance increment at photoelectrode/electrolyte interface.
- Subjects
DYE-sensitized solar cells; TITANIUM dioxide nanoparticles; NITROGEN spectra; BIFUNCTIONAL catalysis; LIGHT scattering; PHOTOLUMINESCENCE
- Publication
Applied Physics A: Materials Science & Processing, 2015, Vol 119, Issue 4, p1283
- ISSN
0947-8396
- Publication type
Article
- DOI
10.1007/s00339-015-9094-3