Numerical analysis of the photo-injection time-of-flight curves in molecularly doped polymers

Tyutnev, A. P.; Ikhsanov, R. Sh.; Saenko, V. S.; Nikerov, D.V.

doi:10.1016/j.chemphys.2018.02.010

Cited by 3 publications

(1 citation statement)

References 28 publications

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“…After a ten year break devoted to the study of charge carrier transport in molecularly doped or photoconductive polymers (see [18] and our latest papers on the subject [45,46]), we turned our attention back to RIC in polymers [20,21], paying special attention to the small-signal step-function irradiations in both pulsed and continuous regimes [20]. In doing so, we relied heavily on our previous experience in the field.…”

Section: Discussionmentioning

confidence: 99%

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

et al. 2019

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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.

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Section: Discussionmentioning

confidence: 99%

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

et al. 2019

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Theoretical analysis of the drift and diffusion of charge carriers in thin layers of organic crystals

et al. 2019

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About charge carrier mobility in common insulating polymers

Tyutnev

Ihksanov

Saenko

et al. 2020

Journal of Applied Physics

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Numerical calculations have been performed on the time of flight transients predicted by a newly developed model describing consistently the radiation-induced conductivity of common insulating polymers under both pulsed and continuous irradiation. The model differs substantially from the conventional multiple trapping formalism based on an exponential trap distribution by the presence of additional deep traps distributed in energy or even external deep traps allowing no thermal detrapping (the so-called sinks). This circumstance complicates the definition of the main transport characteristic, the drift mobility, so familiar in Gaussian (normal) or dispersive transport. An analysis of the current transients has been done in a range of fields (107–109 V/m), decay times (10−9–104 s), and not too thin sample thicknesses (2–20 μm). No operational procedure for the determination of a unique time of flight could be found, and therefore, information about charge carrier transport in common insulating polymers must be obtained through numerical calculations. All previous studies on this subject have been critically reviewed.

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Numerical analysis of the photo-injection time-of-flight curves in molecularly doped polymers

Cited by 3 publications

References 28 publications

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

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

Theoretical analysis of the drift and diffusion of charge carriers in thin layers of organic crystals

About charge carrier mobility in common insulating polymers

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