Title: Crystalline silicon PV module degradation after 20 years of field exposure studied by electrical tests, electroluminescence, and LBIC
Authors: POZZA ALBERTOSAMPLE Tony
Citation: PROGRESS IN PHOTOVOLTAICS vol. 24 no. 3 p. 368-378
Publisher: WILEY-BLACKWELL
Publication Year: 2016
JRC N°: JRC96597
ISSN: 1062-7995
URI: http://onlinelibrary.wiley.com/doi/10.1002/pip.2717/full
http://publications.jrc.ec.europa.eu/repository/handle/JRC96597
DOI: 10.1002/pip.2717
Type: Articles in periodicals and books
Abstract: Standardized tests to assure the reliability of photovoltaic modules and to detect possible early failures of modules when exposed in the field, due to design flaws or to the use of non-appropriate materials, have played an important role in the successful growth of photovoltaic market in recent years. In order for this growth to be sustainable in coming years, it is crucial to keep the confidence of investors in standard well-established technologies and to increase confidence in new emerging technologies. For these reasons, there is an ongoing work for the improvement of current tests and for the development of new ones, which besides assuring module reliability in the field, have also the aim of predicting their lifetime. The analysis of degradation of modules that were field exposed over a long period of time is fundamental to identify the degradation mechanisms and to collect statistics on modules behavior. This work focuses on the analysis of the change of the photovoltaic module electrical characteristics after approximately 20 years of field exposure, considering differences in the design of cells that were used for the production of these modules, which were identified by detailed visual inspection. Failure modes were investigated by comprehensive visual inspection and the use of spatially resolved analysis techniques as follows: laser beam-induced current and electroluminescence. The main failure mode identified was yellowing of the encapsulant.
JRC Directorate:Energy, Transport and Climate

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