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Improved performance of dye-sensitized solar cells with TiO2/alumina core-shell formation using atomic layer deposition SCIE SCOPUS

Title
Improved performance of dye-sensitized solar cells with TiO2/alumina core-shell formation using atomic layer deposition
Authors
Ganapathy, VKarunagaran, BRhee, SW
Date Issued
2010-08-01
Publisher
Elsevier
Abstract
Alumina (Al2O3) shell formation on TiO2 core nanoparticles by atomic layer deposition (ALD) is studied to suppress the recombination of charge carriers generated in a dye-sensitized solar cell (DSSC). It is relatively easy to control the shell thickness using the ALD method by controlling the number of cycles. An optimum thickness can be identified, which allows tunneling of the forward current while suppressing recombination. High-resolution TEM measurements show that a uniform Al2O3 shell is formed around the TiO2 core particles and elemental mapping of the porous TiO2 layer reveals that the Al2O3 distribution is uniform throughout the layer. The amount of dye absorption is increased with increase in the shell thickness but electrochemical impedance spectroscopic (EIS) measurement shows a drastic increase in the resistance. With an optimum Al2O3 thickness of 2 nm deposited by ALD, a 35% improvement in the cell efficiency (from 6.2 to 8.4%) is achieved. (C) 2010 Elsevier B.V. All rights reserved.
Keywords
Atomic layer deposition; Core/shell nanoparticles; TiO2-dye interface; Al2O3-coated TiO2 electrodes; Dye-sensitized solar cells; NANOCRYSTALLINE TIO2; ALUMINUM-OXIDE; THIN-LAYER; NANOPOROUS ELECTRODES; CHARGE RECOMBINATION; EFFICIENCY; IMPEDANCE; AL2O3; FILMS; ENHANCEMENT
URI
https://oasis.postech.ac.kr/handle/2014.oak/25987
DOI
10.1016/J.JPOWSOUR.2010.01.085
ISSN
0378-7753
Article Type
Article
Citation
JOURNAL OF POWER SOURCES, vol. 195, no. 15, page. 5138 - 5143, 2010-08-01
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