a-Si太阳能电池的亚稳态分流路径

T. J. McMahon, M. Bennett
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引用次数: 13

摘要

在非晶硅(a-Si)单结和三结太阳能电池中,无论是由光浸透还是电偏置引起的分流电流的短暂性和不稳定性一直是一个真正的难题,使这些电池的研究变得困难。作者仔细研究了几种不同的a- si太阳能电池结构中这些电流瞬变的时间/电压依赖性,并发现它们揭示了更多关于基本分流机制的信息。在单结电池中,他们看到电流的逐步变化,随着反向偏置的增加,电流的大小和数量增加,并且可以通过正向偏置消除。这种渐进式的通断开关表明了一种离散的分流通路传导机制。这些亚稳态分流路径的动力学表明,“开状态”和“关状态”都具有记忆。没有(Al)ZnO的细胞没有亚稳态开关。作者将这种渐变特性与织构衬底联系起来,将开关亚稳态与(Al)ZnO接触联系起来。在三结细胞中,每一步发生数百次振荡。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Metastable shunt paths in a-Si solar cells
The transitory and erratic nature of shunt currents, whether caused by light-soaking or electrical biasing, in amorphous Si (a-Si) single- and triple-junction solar cells has been a real puzzle and made the study of these cells difficult. The authors present a careful study of the time/voltage dependence of these current transients in several different a-Si solar cell structures and find they reveal more about the basic shunt mechanism. In single-junction cells, they see stepwise current changes that increase in size and number with reverse bias and can be removed with forward bias. This stepwise, on and off switching suggests a discrete shunt path conduction mechanism. The kinetics of these metastable shunt paths show that both the "on-state" and "off-state" possess memory. Cells without (Al)ZnO show no metastable switching. The authors associate the stepwise features with the textured substrate and the switching metastability with contact to (Al)ZnO. Switching in triple-junction cells occurs with hundreds of oscillations at each step.
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