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. 2018 May 23;8(6):356. doi: 10.3390/nano8060356

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© 2018 by the authors.

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/).

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Energy-level diagram showing the valence band (VB) and conduction band (CB) levels of several typical perovskites [43,44,45,46,47,48].