光伏
材料科学
晶界
光电子学
电阻式触摸屏
薄膜
电极
降级(电信)
开路电压
电压
光伏系统
凝聚态物理
纳米技术
计算机科学
电气工程
化学
物理
复合材料
电信
工程类
微观结构
物理化学
作者
V. G. Karpov,A. Compaan,Diana Shvydka
摘要
We discuss the physical origin and effects of micrononuniformities on thin-film photovoltaics. The key factors are the large device area and the presence of potential barriers in the grain boundaries (for polycrystalline films) and in device junctions. We model the nonuniformity effects in the terms of random microdiodes connected in parallel through a resistive electrode. The microdiodes of low open circuit voltages are shown to affect macroscopically large regions. They strongly reduce the device performance and induce its nonuniform degradation in several different modes. We support our predictions by experiments, which show that the device degradation is driven by the light-induced forward bias and is spatially nonuniform.
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