Charge transport properties of dielectrics revealed by isothermal surface potential decay

Daomin Min*, Mengu Cho, Arifur R. Khan, Shengtao Li

*この研究の対応する著者

研究成果: Article査読

26 被引用数 (Scopus)

抄録

Revealing the charge transport properties of space grade high insulation materials can benefit the mitigation of electrostatic discharges (ESD) on spacecraft. The charge transport properties of polyimide are investigated by an isothermal surface potential decay (ISPD) experiment under a simulated space environment chamber. After irradiated the sample by an electron gun, the 2-D surface potential distributions are measured by a non-contact potential probe. From the surface potential decay curves, we obtain current density at steady state ISPD. Analyzing the steady state current density against surface potential, we find two regimes. One is Ohmic regime and another is Space Charge Limited Current (SCLC) regime, which are separated at around -950 V with the sample thickness of 27 μm at 298 K. Ohmic resistivity and effective charge carrier mobility are calculated from these two regimes, respectively. In addition, the trap density of polyimide is derived from the SCLC theory, when the sample is charged to high initial surface potential.

本文言語English
論文番号6260024
ページ(範囲)1465-1473
ページ数9
ジャーナルIEEE Transactions on Dielectrics and Electrical Insulation
19
4
DOI
出版ステータスPublished - 2012
外部発表はい

ASJC Scopus subject areas

  • 電子工学および電気工学

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