Dynamic charge transport behavior of double-layer thin film materials under electron beam irradiation

作者：Wen-Tong An, Bai‐Peng Song, Guangyu Sun, Xiong Yang, Ke-Han Cao, Y.Z. You, Yun Li, Falun Song, Xiao-Gang Qin, Guanjun Zhang · 发表于：Journal of Physics D Applied Physics · 年份：2025 · DOI：10.1088/1361-6463/add746 · 被引用次数：7 · 研究领域：Engineering Applied Research、Advancements in Photolithography Techniques、Silicon and Solar Cell Technologies

Abstract Spacecraft dielectrics in the complex space environment often suffer charging and discharging, causing on-orbit anomalies and failures. Studying charge transport in the dielectric during a spacecraft’s charging process is crucial. It helps take measures like surface coating to regulate the surface potential and reduce electrostatic discharges. A double-layer material electron self-consistent transport model, which can simulate the dynamic charge transport behavior of coated spacecraft dielectrics under electron beam irradiation, is developed and used to numerically simulate coated polyimide. It reveals the spatial–temporal distributions of microscopic quantities (charge density, electric field), and temporal evolutions of macroscopic quantities (surface potential, secondary electron yield). Then, the effects of intrinsic properties including electron affinity, band gap, mass density, relative permittivity, and trap density of coating materials on the charging process of spacecraft dielectrics are analyzed, including above microscopic and macroscopic quantities. It is found that decreases in mass density and increases in electron affinity, band gap, and trap density decrease the absolute value of the steady-state surface potential, while the relative permittivity is shown to exert only limited. Obtained trends guide coating material selection for surface charging mitigation. Four coated polyimides’ (PI) steady-state potentials are compared, and the diamond-like carbon...