Coverage Analysis for the Core/Shell Electrode of Dye-Sensitized Solar Cells
Resource
The Journal of Physical Chemistry C, 114(21), 10048-10053
Journal
The Journal of Physical Chemistry C
Pages
10048-10053
Date Issued
2010
Date
2010
Author(s)
Abstract
In this study, we established a core/shell (C/S) model that evaluates the surface coverage of an overlayer deposited on nanoparticles in terms of X-ray photoelectron spectroscopy signals of the nanoparticles. We used the model to estimate the coverage of Al2O3 shell layers, which were deposited on the nanoporous TiO2 electrodes of dye-sensitized solar cells (DSSCs) by atomic layer deposition (ALD), as a function of the number of ALD reaction cycles. The surface coverage increased with the average thickness of the Al2O3 shell layers, indicating that the ALD Al2O3 deposition on the nanoporous electrode was via the island growth mode. The power conversion efficiency of the DSSCs was highest after the first ALD reaction cycle for the Al2O3 shell layers, which had a coverage of 0.25, according to the C/S model. The study shows that, to further improve the PCE, optimization of the ALD Al2O3 deposition condition is required so that the surface coverage of the shell layer can be increased at the first ALD reaction cycle.
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Type
journal article
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