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Journal of Photonics for Energy

Design rules of nanostructured transparent conductive electrodes for light trapping in hematite photoanodes
Author(s): Behrooz Eftekharinia; Ahmad Moshaii; Ali Dabirian
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Paper Abstract

Hematite is an appealing material for photoelectrochemical water splitting due to nearly ideal bandgap and Earth abundance. However, its short-distance hole transport has so far hindered exploiting its full potential. Two nanostructured transparent electrodes coated with a thin hematite layer are studied using full-field electromagnetic modeling. One structure comprises an ordered array of stripes of a transparent conductive oxide (TCO) and the other is composed of a square-lattice array of TCO nanorods. We find that height and filling ratio (FR) of the nanostructured elements constitutes the most crucial design parameter where the tall nanostructures with small FR constitute the ideal design for a nanostructured electrode with resonant-size elements. The simulations show that current densities up to 10.4  mA cm−2 can be obtained in a 20-nm thick hematite layer uniformly coated onto a properly designed nanostructured transparent conductive scaffold. Practical permittivity data are used in the simulation and the results show that these structures are quite robust against irregularities that might occur during the fabrications process.

Paper Details

Date Published: 22 August 2017
PDF: 15 pages
J. Photon. Energy 7(3) 037001 doi: 10.1117/1.JPE.7.037001
Published in: Journal of Photonics for Energy Volume 7, Issue 3
Show Author Affiliations
Behrooz Eftekharinia, Institute for Research in Fundamental Sciences (Iran, Islamic Republic of)
Kermanshah Univ of Technology (Iran, Islamic Republic of)
Ahmad Moshaii, Institute for Research in Fundamental Sciences (Iran, Islamic Republic of)
Tarbiat Modares Univ (Iran, Islamic Republic of)
Ali Dabirian, Institute for Research in Fundamental Sciences (Iran, Islamic Republic of)

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