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. 2021 Jul 16;11:14618. doi: 10.1038/s41598-021-94078-8

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© The Author(s) 2021

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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TFT characteristics used to determine the flat band parameters before and after deep UV light (λ = 172 nm) radiation. (a) Transfer (I_D^–V_GS) characteristics. (b) Capacitance–voltage (C^–V_GS) characteristics. (c) Extracted surface potential (ψ_S) as a function of V_GS. The flat band voltage (V_FB), which is taken as the V_GS corresponding to ψ_S = 0 eV, decreases from 0.36 to − 5.89 V after deep UV radiation.