This question is part of the Super Big Solar Panel FAQ from Solar Mango, where expert answers to over 100 important questions on solar panels are provided.
Because of the disordered nature of amorphous silicon, solar cells are subject to the Staebler-Wronski effect, which reduces the solar cell efficiency by up to 15 percent within the first 1000 hours.
This undesired effect is triggered by internal annihilation — known in physics as recombination — of charge that has not been extracted from the solar cell. The released recombination energy induces defects in the amorphous network called Light Induced Defects.
Source: Solar Cell Light Induced Defects from Solar Mango’s Solar Dictionary
Source: Solar Panels are a 25 Year Relationship – Don’t Screw Up
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