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scattering-property
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Simply synthesized TiO2 nanorods as an effective scattering layer for quantum dot sensitized solar cells
, Article Chinese Physics B ; Vol. 23, issue. 4 , 2014 ; Zad, A. I ; Molaei, M ; Sharif University of Technology
Abstract
TiO2 nanorod layers are synthesized by simple chemical oxidation of Ti substrates. Diffuse reflectance spectroscopy measurements show effective light scattering properties originating from nanorods with length scales on the order of one micron. The films are sensitized with CdSe quantum dots (QDs) by successive ionic layer adsorption and reaction (SILAR) and integrated as a photoanode in quantum dot sensitized solar cells (QDSCs). Incorporating nanorods in photoanode structures provided 4- to 8-fold enhancement in light scattering, which leads to a high power conversion efficiency, 3.03% (Voc = 497 mV, Jsc = 11.32 mA/cm2, FF = 0.54), in optimized structures. High efficiency can be obtained...
Efficient dye-sensitized solar cells based on carbon-doped TiO2 hollow spheres and nanoparticles
, Article Journal of Materials Science: Materials in Electronics ; Volume 26, Issue 11 , 2015 , Pages 8863-8876 ; 09574522 (ISSN) ; Mohammadi, M. R ; Sharif University of Technology
Springer New York LLC
2015
Abstract
Different structures of TiO2 photoelectrodes are fabricated with various arrangement modes of the layers. TiO2 nanoparticles, synthesized by stabilizing agent free non-hydrolytic sol–gel method, are employed as the under layer, whereas carbon-doped TiO2 hollow spheres, prepared by hydrothermally grown carbon template, are used as the scattering layer of solar cells. The nanoparticles (22 nm) have anatase structure, while 300–700 nm hollow spheres show mixtures of anatase and rutile phases. X-ray photoelectron spectroscopy confirms that carbon is doped into TiO2 hollow spheres, resulting in a decrease in band gap energy in the range 2.96–3.13 eV compared with 3.04 eV band gap energy for the...
Scattering with reinforced concrete wall in 900MHz band using MOM/CI method
, Article 3rd European Conference on Antennas and Propagation, EuCAP 2009, Berlin, 23 March 2009 through 27 March 2009 ; 2009 , Pages 121-125 ; 9783000245732 (ISBN) ; Shishegar, A. A ; Sharif University of Technology
2009
Abstract
The proliferation of communication system used in and around man-made structures has resulted in growing need to determine the scattering properties of various commonly used building materials at radio frequencies typically used in business and residential environments. This paper describes the calculation of scattered wave by reinforced concrete walls. For these walls is modeled with a grid of straight wire. We used the Method of Moments (MOM) to find the wire currents. The complex images (CI) method is also used to rapidly evaluate spatial-domain Green's functions for the wall. The angular dependence of scattered fields is shown