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Effect of nanostructured electrode architecture and semiconductor deposition strategy on the photovoltaic performance of quantum dot sensitized solar cells
, Article Electrochimica Acta ; Volume 75 , 2012 , Pages 139-147 ; 00134686 (ISSN) ; Giménez, S ; Boix, P. P ; Shen, Q ; Calvo, M. E ; Taghavinia, N ; Zad, A. I ; Toyoda, T ; Míguez, H ; Mora Seró, I ; Sharif University of Technology
Elsevier
2012
Abstract
Here we analyze the effect of two relevant aspects related to cell preparation on quantum dot sensitized solar cells (QDSCs) performance: the architecture of the TiO 2 nanostructured electrode and the growth method of quantum dots (QD). Particular attention is given to the effect on the photovoltage, V oc, since this parameter conveys the main current limitation of QDSCs. We have analyzed electrodes directly sensitized with CdSe QDs grown by chemical bath deposition (CBD) and successive ionic layer adsorption and reaction (SILAR). We have carried out a systematic study comprising structural, optical, photophysical and photoelectrochemical characterization in order to correlate the material...
Optimal Ag concentration for H2 production via Ag:TiO 2 nanocomposite thin film photoanode
, Article International Journal of Hydrogen Energy ; Volume 37, Issue 4 , Feb , 2012 , Pages 3056-3065 ; 03603199 (ISSN) ; Kim, H ; Choi, W ; Moshfegh, A. Z ; Sharif University of Technology
Abstract
TiO2 thin films containing different concentrations of Ag nanoparticles have been synthesized by sol-gel method. According to UV-visible spectra, presence of an intense surface plasmon resonance peak at 490 nm of wavelength indicated formation of silver nanoparticles in the TiO2 films. Based on atomic force microscopy (AFM) analysis, the surface roughness and the effective surface ratio increased by increasing the Ag mol%. Moreover, scanning electron microscopy (SEM) images showed formation of Ag nanoparticles on the surface for the samples containing high Ag concentration. X-ray diffraction (XRD) patterns revealed that the size of Ag nanocrystals increased by increasing the Ag content in...
Enhanced electron collection efficiency in dye-sensitized solar cells based on nanostructured TiO2 hollow fibers
, Article Nano Letters ; Volume 10, Issue 5 , April , 2010 , Pages 1632-1638 ; 15306984 (ISSN) ; Taghavinia, N ; Zakeeruddin, S. M ; Grätzel, M ; Moser, J. E ; Sharif University of Technology
2010
Abstract
Nanostructured TiO2 hollow fibers have been prepared using natural cellulose fibers as a template. This cheap and easily processed material was used to produce highly porous photoanodes incorporated in dye-sensitized solar cells and exhibited remarkably enhanced electron transport properties compared to mesoscopic films made of spherical nanoparticles. Photoinjected electron lifetime, in particular, was multiplied by 3-4 in the fiber morphology, while the electron transport rate within the fibrous photoanaode was doubled. A nearly quantitative absorbed photon-to-electrical current conversion yield exceeding 95% was achieved upon excitation at 550 nm and a photovoltaic power conversion...