Electrocatalytic activity of chemically deposited CuxS thin film for counter electrode in quantum dots-sensitized solar cells

Title
Electrocatalytic activity of chemically deposited CuxS thin film for counter electrode in quantum dots-sensitized solar cells
Authors
한성환
Keywords
Semiconductor; Nanostructures; Chemical synthesis; Electrochemical techniques
Issue Date
2014-12
Publisher
ELSEVIER SCIENCE SA
Citation
MATERIALS CHEMISTRY AND PHYSICS, 148(3), p.562-568
Abstract
The compact (c-CuxS) and the porous (p-CuxS) with particle decorated films of coppersulfidearesynthesized using a chemical bath deposition technique, and the films are characterized using electrochemical techniques. In addition, the chemically deposited CuxS films are investigated as a counter electrode in quantum dots-sensitized solar cells (QSSCs). The available redox active reaction sites of the p-CuxS film are found to be 57.9% higher than those available in the c-CuxS film. From the electrochemical impedance spectroscopy, the effective diffusion coefficients of the polysulfide electrolyte in the c-CuxS and p-CuxS films are estimated to be 3.67 x 10(-5) and 6.35 x 10(-5) cm(2) s(-1), respectively. These results can be ascribed to the improvement in the available redox active reaction sites and the electrocatalytic activity of the CuxS counter electrode. As compared to the c-CuxS film, the p-CuxS film as a counter electrode exhibits an enhanced photovoltaic performance of the QSSCs with the power conversion efficiency of 3.17%, short-circuit current of 11.89 mA c(-)m(2), open-circuit voltage of 0.50 V, and fill factor of 53.29. The improved performance of the QSSCs is ascribed to the improvements on the available redox active reaction sites, electrocatalytic activity and the diffusion coefficients, which are directly related to the surface morphology of the sulfide films. (C) 2014 Elsevier B.V. All rights reserved.
URI
https://www.sciencedirect.com/science/article/pii/S0254058414005070http://hdl.handle.net/20.500.11754/52535
ISSN
0254-0584; 1879-3312
DOI
http://dx.doi.org/10.1016/j.matchemphys.2014.08.008
Appears in Collections:
COLLEGE OF NATURAL SCIENCES[S](자연과학대학) > CHEMISTRY(화학과) > Articles
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