October 15th, 2012 by James Ayre
The Laboratory for Photovoltaics at the University of Luxembourg has recently devised a new method to observe the causes of and prevent solar cell degradation before solar cell production is even finished. This will have huge effects on the solar cell manufacturing industry because of how fast chemical damage to solar cells can happen, and the large costs such damage incurs.
Solar panels convert the sun’s light into electrical current through the use of solar cells, which are the generators responsible for the energy solar panels produce. A specific type of solar cells, thin film solar cells, possess a special coating that is what actually absorbs the sun’s energy — this film can be easily degraded during the solar panel production process though.
“A thin film solar cell is a stack of several layers. The main one is the layer that absorbs the light and transforms it into electricity. If these absorbers are not processed immediately they lose part of their ability to convert light energy,” says researcher David Regesch of the Laboratory for Photovoltaics, Physics Research Unit at the University of Luxembourg.
For the new research, a laser was shone onto a solar cell and the light that was released by this was measured, which led to the finding that the degradation usually occurs within the first few minutes. And, importantly, it was found that the degradation was reversible and could be prevented, by immediately putting another layer on top of the solar cell. This stabilizes the solar cell.
“In the photovoltaics industry, solar cells are processed as fast as possible for economic reasons, and now scientists have shown a physical reason why this process should be completed quickly.”
The new research was just published in Applied Physical Letters.
Source: Université du Luxembourg
Image Credits: GE
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