III-V型商用聚光器三结太阳能电池的初步温度加速寿命试验

P. Espinet-González, C. Algora, V. Orlando, N. Núñez, M. Vázquez, J. Bautista, H. Xiugang, L. Barrutia, I. Rey‐Stolle, K. Araki
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引用次数: 3

摘要

对60块GaInP/GaInAs/Ge三结商用聚光太阳能电池进行了定量温度加速寿命试验。本实验的最终目的是评估高浓度太阳能电池在中等时间内的可靠性、保修期和失效机理。通过在聚光器下将太阳能电池置于明显高于标称工作温度的温度下来实现降解的加速,而在黑暗中通过注入电流来模拟光电流的标称条件。为了得到应力水平下的时间与标称工作条件下的时间之间的加速度系数,需要在三种不同温度下进行三次实验。然而,到目前为止,只有在最高温度下的测试已经完成。因此,我们无法提供完整的可靠性信息,但我们分析了气候室内太阳能电池在最高温度下的寿命数据和失效模式。所有的失败都是灾难性的。事实上,太阳能电池已经短路了。我们将失效分布拟合为一个双参数威布尔函数。故障是磨损型的。我们观察到母线和周围的手指已经完全损坏。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Preliminary temperature accelerated life test (ALT) on III-V commercial concentrator triple-junction solar cells
A quantitative temperature accelerated life test on sixty GaInP/GaInAs/Ge triple-junction commercial concentrator solar cells is being carried out. The final objective of this experiment is to evaluate the reliability, warranty period, and failure mechanism of high concentration solar cells in a moderate period of time. The acceleration of the degradation is realized by subjecting the solar cells at temperatures markedly higher than the nominal working temperature under a concentrator, while the photo-current nominal conditions are emulated by injecting current in darkness. Three experiments at three different temperatures are necessary in order to obtain the acceleration factor which relates the time at the stress level with the time at nominal working conditions. However, up to now only the test at the highest temperature has finished. Therefore, we can not provide complete reliability information but we have analyzed the life data and the failure mode of the solar cells inside the climatic chamber at the highest temperature. The failures have been all of them catastrophic. In fact, the solar cells have turned into short circuits. We have fitted the failure distribution to a two parameters Weibull function. The failures are wear-out type. We have observed that the busbar and the surrounding fingers are completely deteriorated.
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