薄膜太阳能电池的反偏置行为:测量引起的加热效应

IF 1.9 Q3 PHYSICS, APPLIED
S. Heise, A. Komilov, M. Richter, B. Pieters, A. Gerber, Janet Neerken
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引用次数: 0

摘要

当太阳能电池受到负电压偏置时,由于沉积的电力,它在局部加热。因此,对负电压状态下电池特性的每一次研究都面临着这样的挑战:测量本身会以一种难以量化的方式改变电池的状态:一方面,已知反向击穿强烈依赖于温度。另一方面,负电压导致亚稳态器件变化,这对温度也非常敏感。在目前的研究中,我们引入了一种新的方法来抑制这种测量引起的加热,即在测量时在单个电压脉冲之间插入时间延迟。作为样品系统,我们使用了基于Cu(In,Ga)Se2 (CIGS)吸收层的薄膜太阳能电池。首先,我们验证了这种方法在很大程度上减少了测量引起的加热。这使我们能够分析加热对电池两个特性的影响:(i)反向击穿行为和(ii)反向偏置诱导的亚稳器件变化。结果表明,减小测量引起的加热会导致击穿电压的显著增加,并有效地减缓亚稳动力学。对于反向击穿,被认为驱动击穿的基本隧道机制在质量上保持不变,但加热影响了从相关能垒提取的定量值。对于反偏置亚稳性,实验数据表明,除了两性(VSe-VCu)价差配合物在前界面引起电荷重分布外,还观察到离子向后界面迁移引起的输运势垒的改变。本研究的发现表明,由于反向偏置测量引起的局部样品加热会对设备行为产生显着影响,在开发潜在物理过程模型时需要牢记这一点。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Reverse-bias behaviour of thin-film solar cells: effects of measurement-induced heating
When a solar cell is subjected to a negative voltage bias, it locally heats up due to the deposited electrical power. Therefore, every investigation of cell characteristics in the negative voltage regime faces the challenge that the measurement itself changes the state of the cell in a way that is difficult to quantify: On the one hand, the reverse breakdown is known to be strongly temperature dependent. On the other hand, negative voltages lead to metastable device changes which are also very sensitive to temperature. In the current study, we introduce a new approach to suppress this measurement-induced heating by inserting time delays between individual voltage pulses when measuring. As a sample system we use thin-film solar cells based on Cu(In,Ga)Se2 (CIGS) absorber layers. First we verify that with this approach the measurement-induced heating is largely reduced. This allows us to then analyse the impact of the heating on two characteristics of the cells: (i) the reverse breakdown behaviour and (ii) reverse-bias-induced metastable device changes. The results show that minimising the measurement-induced heating leads to a significant increase of the breakdown voltage and effectively slows down the metastable dynamics. Regarding the reverse breakdown, the fundamental tunneling mechanisms that are believed to drive the breakdown remain qualitatively unchanged, but the heating affects the quantitative values extracted for the associated energy barriers. Regarding the reverse-bias metastability, the experimental data reveal that there are two responsible mechanisms that react differently to the heating: Apart from a charge redistribution at the front interface due to the amphoteric (VSe–VCu) divacancy complex, the modification of a transport barrier is observed which might be caused by ion migration towards the back interface. The findings in this study demonstrate that local sample heating due to reverse-bias measurements can have a notable impact on device behaviour which needs to be kept in mind when developing models of the underlying physical processes.
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来源期刊
EPJ Photovoltaics
EPJ Photovoltaics PHYSICS, APPLIED-
CiteScore
2.30
自引率
4.00%
发文量
15
审稿时长
8 weeks
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