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Open AccessArticle

Time-Resolved Radiation-Induced Conductivity of Polyimide and Its Description Using the Multiple Trapping Formalism

National Research University Higher School of Economics, Moscow 101000, Russia
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Polymers 2019, 11(12), 2061; https://doi.org/10.3390/polym11122061
Received: 1 November 2019 / Revised: 1 December 2019 / Accepted: 8 December 2019 / Published: 11 December 2019
(This article belongs to the Special Issue Functional and Conductive Polymer Thin Films I)
Polymer dielectrics subjected to intense radiation fluxes exhibit a radiation-induced conductivity (RIC). Polyimide is a good dielectric with excellent mechanical and thermal properties featuring high radiation resistance currently widely used in the spacecraft industry. Its RIC has been extensively studied in several laboratories. The purpose of the present study is to make a direct measurement of the RIC for both pulsed and continuous irradiation using a current sensing technique, which is contrary to the indirect method employing a surface-potential decay technique that is now preferred by spacecraft charging engineers. Our experiments are done in a small-signal regime excluding any recombination and dose effects. In combination with existing computer codes, we managed to develop further the conventional multiple trapping formalism and the RIC theory based on it. The main idea is to supplement an exponential trap distribution responsible for a dominant dispersive carrier transport in polymers with a small concentration of inherent deep traps which may or may not have an energy distribution. In line with this reasoning, we propose a tentative set of RIC model parameters for polyimide that accounts for the observed experimental data. The findings and their implications are discussed in a broad context of previous studies. View Full-Text
Keywords: polymers; irradiation by electrons; small-signal regime; dispersive transport; numerical calculations polymers; irradiation by electrons; small-signal regime; dispersive transport; numerical calculations
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MDPI and ACS Style

Tyutnev, A.; Saenko, V.; Zhadov, A.; Pozhidaev, E. Time-Resolved Radiation-Induced Conductivity of Polyimide and Its Description Using the Multiple Trapping Formalism. Polymers 2019, 11, 2061.

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