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Energies 2018, 11(10), 2659;

Electroluminescence Test to Investigate the Humidity Effect on Solar Cells Operation

CNR-INO National Institute of Optics, Largo E. Fermi, 50125 6—Firenze, Italy
Department DIEF, University of Florence, Via Santa Marta, 50139 3—Firenze, Italy
Author to whom correspondence should be addressed.
Received: 28 August 2018 / Revised: 24 September 2018 / Accepted: 2 October 2018 / Published: 5 October 2018
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The electroluminescence test is an experiment typically used to verify the behavior of the photovoltaic cell and to qualitatively check its integrity. It works by operating the photovoltaic cell as a diode polarized directly: the cells that light up in a module indicate how many of them work. This test provides an estimate of the maximum performance of the entire photovoltaic module. A qualitative inspection was performed by electroluminescence tests on 48 modules of photovoltaic cells. They had already been installed on a small-size concentration solar plant before the test and some modules had reached a lower level of performance than expected. A first electroluminescence test was performed, which showed that only 61.5% of the photocells worked. Since there were visible signs of humidity within the various modules, some of the inoperative modules underwent a dehumidification treatment in a climatic chamber. A second electroluminescence test showed that the percentage of functioning cells had increased to 66.3% after the drying treatment. View Full-Text
Keywords: photovoltaic; electroluminescence; humidity; climatic chamber photovoltaic; electroluminescence; humidity; climatic chamber

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Fontani, D.; Sansoni, P.; Francini, F.; Messeri, M.; Pierucci, G.; DeLucia, M.; Jafrancesco, D. Electroluminescence Test to Investigate the Humidity Effect on Solar Cells Operation. Energies 2018, 11, 2659.

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