22 August 2017 Design rules of nanostructured transparent conductive electrodes for light trapping in hematite photoanodes
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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.
© 2017 Society of Photo-Optical Instrumentation Engineers (SPIE)
Behrooz Eftekharinia, Behrooz Eftekharinia, Ahmad Moshaii, Ahmad Moshaii, Ali Dabirian, Ali Dabirian, } "Design rules of nanostructured transparent conductive electrodes for light trapping in hematite photoanodes," Journal of Photonics for Energy 7(3), 037001 (22 August 2017). https://doi.org/10.1117/1.JPE.7.037001 . Submission: Received: 14 March 2017; Accepted: 26 July 2017
Received: 14 March 2017; Accepted: 26 July 2017; Published: 22 August 2017
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