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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
Optical reflectance spectra and external quantum efficiency (EQE) responses of the bare silicon solar cell, the solar cell with a SiO2 layer, and the solar cell with an ITO layer.