Because of excellent mechanical properties, thermal insulation and ideal radiation resistance, polyimide (PI) is one of the best choices as a flexible solar backsheet in photovoltaic systems. In this study, accumulation characteristics of surface charge of PI backsheet under temperature-controlled corona polarization were investigated both theoretically and experimentally. In order to investigate the surface charge accumulation of PI backsheet under the effect of different temperatures, finite element method (FEM) was used. The mechanisms by which the temperature influenced accumulation and decay processes of the surface charge of the PI backsheet were investigated. The results show that the carrier mobility of PI backsheet increased in the stages of charge accumulation and charge decay, which then has an indirect effect on the dynamic characteristics of the surface charge. Charge accumulation decreases with the increase of temperature, and both accumulation process and decay process occurred simultaneously. The results of this study provide theoretical support for the modification of PI backsheet. At the same time, a practical theoretical method for modeling and simulating the charge diffusion of insulating PI backsheet under the influence of temperature was explored.

中文翻译：

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不同温度条件下柔性光伏组件绝缘背板表面电荷耗散仿真

由于优异的机械性能、隔热性和理想的抗辐射性，聚酰亚胺（PI）是光伏系统中作为柔性太阳能背板的最佳选择之一。本研究从理论和实验两方面研究了温控电晕极化下 PI 背板表面电荷的积累特性。为了研究不同温度作用下PI背板的表面电荷积累，采用有限元法（FEM）。研究了温度影响PI背板表面电荷积累和衰减过程的机制。结果表明，PI背板的载流子迁移率在电荷积累和电荷衰减阶段增加，然后对表面电荷的动态特性产生间接影响。电荷积累随着温度的升高而减少，积累过程和衰变过程同时发生。本研究结果为PI背板的改性提供了理论支持。同时，探索了一种模拟模拟绝缘PI背板在温度影响下电荷扩散的实用理论方法。