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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/).
(a) UV-Vis diffuse reflectance spectra of samples; (b) Estimated band gaps of UV-Vis spectra of the samples; (c) Transient photocurrent response; (d) Photoluminescence (PL) spectra at an excitation wavelength of 280 nm.