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Sharifi N.,Institute of Nanoscience and NanotechnologyUniversity of KashanKashan87317Iran
Physica Status Solidi (A) Applications and Materials Science | Year: 2015

Conventionally, a film of TiO2 particles of ∼300nm size is employed in Dye-sensitized solar cells (DSCs) as the back reflector film to enhance the light harvesting. Perfect reflectance of silver in visible and near infrared motivates to investigate its potential as the material for the light back reflector film in DSCs. In this study, light back reflector films consisting of 300nm-sized silver particles, as well as vacuum evaporated silver flat film, were fabricated and compared to 300nm-sized rutile-type TiO2 particulate reflector film to study their optical aspects. Conventional TiO2 rutile-type particulate film demonstrates slightly lower performance compared to silver flat films. It is also found that for silver, the morphology is critically important. Iodide-based and cobalt-based electrolytes with different transparencies in the visible range were used to compare the effect of electrolyte transparency on light back reflection. In cobalt-based cell, 26%, 21%, and 13% enhancement in photocurrent is observed when the cells are modified with silver flat film, TiO2 particulate, and silver particulate films, respectively in which external quantum efficiency measurement confirms this trend. In addition, optical calculations demonstrate that in the range of 400-500nm, absorption loss is 40% and 30% for iodide-based and cobalt-based electrolytes, respectively. © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Zahedifar M.,Institute of Nanoscience and NanotechnologyUniversity of KashanKashan87317Iran | Ghanbari E.,Institute of Nanoscience and NanotechnologyUniversity of KashanKashan87317Iran | Moradi M.,Institute of Nanoscience and NanotechnologyUniversity of KashanKashan87317Iran | Saadat M.,Institute of Nanoscience and NanotechnologyUniversity of KashanKashan87317Iran
Physica Status Solidi (A) Applications and Materials Science | Year: 2014

The single phase CGS nanoparticles were synthesized by solvothermal method. The optimal annealing regime of synthesis stage was determined as 180°C for 12h followed by an extra annealing at 230°C for 12h. The phase improvements were studied using X-ray diffraction (XRD) patterns. Grain size ranging from 20-50nm was obtained by SEM and TEM images and confirmed by Scherrer's formula. Band gap of 2.48eV and a broad PL spectrum peaking at 3.16eV were resulted respectively from studies on UV-Visible absorption and photoluminescence (PL) patterns of the synthesized nanoparticles. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

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