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Nitrogen-doped submicron-size TiO2 particles as bifunctional light scatterers in dye-sensitized solar cells

Shogh, S ; Sharif University of Technology | 2015

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  1. Type of Document: Article
  2. DOI: 10.1007/s00339-015-9094-3
  3. Publisher: Springer Verlag , 2015
  4. Abstract:
  5. The structural, electrical, optical, and photovoltaic properties of aggregated submicron nitrogen-doped TiO2 particles (NTiO2) 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 NTiO2 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 NTiO2 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
  6. Keywords:
  7. Doping (additives) ; Dye-sensitized solar cells ; Efficiency ; Light scattering ; Nitrogen ; Scanning electron microscopy ; Solar power generation ; Titanium dioxide ; X ray diffraction ; Charge collection efficiency ; Diffuse reflectance spectrum ; Field emission scanning electron microscopes ; Light-scattering layer ; Nitrogen-doped tio ; Overall conversion efficiency ; Photovoltaic characteristics ; Photovoltaic property ; Solar cells
  8. Source: Applied Physics A: Materials Science and Processing ; Volume 119, Issue 4 , 2015 , Pages 1283-1290 ; 09478396 (ISSN)
  9. URL: http://link.springer.com/article/10.1007%2Fs00339-015-9094-3