Accelerated aging and contact degradation of CIGS solar cells

T. Ott, T. Walter, D. Hariskos, O. Kiowski, R. Schaffler
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引用次数: 1

Abstract

The long-term stability of solar cells is a crucial factor for the competitiveness of a technology. In this study, the accelerated aging of CIGS solar cells was studied, and the influence of an applied bias during the endurance test on the open-circuit voltage Voc and fill factor (FF) was investigated. Time constants for parameter drifts of the open-circuit voltage and the associated activation energy were determined. The observed parameter drifts will be discussed, and a model will be proposed based on SCAPS simulations, explaining the observed behavior of the electrical characteristics of the solar cells. Therefore, cells were dark annealed under dry conditions at two different temperatures and different voltage biases were applied to the cells. Our study revealed that the application of a positive bias, which is similar to light soaking, first leads to an improvement and stabilization of the open-circuit voltage and FF followed by a slow decrease of these parameters. This long-term decrease can be explained in terms of a back barrier or phototransistor, as simulated with SCAPS. However, applying a positive bias enhances the long-term stability of these devices. The appearance of a back barrier is associated with a time constant exceeding 30 years. Therefore, this degradation mechanism is not critical.
CIGS太阳能电池的加速老化和接触退化
太阳能电池的长期稳定性是一项技术竞争力的关键因素。本文研究了CIGS太阳能电池的加速老化问题,并研究了耐久试验中施加偏压对开路电压Voc和填充因子(FF)的影响。确定了开路电压参数漂移的时间常数和相应的活化能。将讨论观测到的参数漂移,并提出一个基于SCAPS模拟的模型,解释太阳能电池电特性的观测行为。因此,在两种不同温度的干燥条件下对电池进行暗退火,并对电池施加不同的电压偏差。我们的研究表明,应用类似于光浸泡的正偏置,首先导致开路电压和FF的改善和稳定,然后这些参数缓慢下降。这种长期的下降可以用背势垒或光电晶体管来解释,用SCAPS进行模拟。然而,施加正偏压可以增强这些器件的长期稳定性。后屏障的出现与超过30年的时间常数有关。因此,这种退化机制并不重要。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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