Espinet González, Pilar and Algora del Valle, Carlos and Orlando Carrillo, Vincenzo and Nuñez Mendoza, Neftali and Vázquez López, Manuel and Bautista Villares, Jesus and Xiugang, He and Barrutia Poncela, Laura and Rey-Stolle Prado, Ignacio and Araki, Kenji
Preliminary temperature Accelerated Life Test (ALT) on III-V commercial concentrator triple-junction solar cells.
In: "38th IEEE Photovoltaic Specialists Conference (PVSC), 2012", 03/06/2012 - 08/06/2012, Austin, Texas (USA). pp..
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 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 deteriorate