Reverse Bias Electroluminescence - A New Light on Solar Cells
Dominik Lausch from the Department of Semiconductor Physics at the Institute of Experimental Physics II investigates solar cells to which he attached current flowing in the opposite direction,called reverse bias. Here too, the solar cells show characteristic luminescence effects, yet they are exclusively on the defects, in particular on the grain boundaries contained in the multicrystalline material of his investigation.
A very sharp image of the luminescence emerges, an optical radiation through the transition of electrons to a low-energy ground level state.This makes it possible to locate and identify defects with a spatial resolution previously not known or achieved. The method established by the researchers is called ReBEL which stands for "Reverse Bias Electroluminescence". The research findings underscore that photovoltaics are a sustainable and environmentally friendly technology.
A very sharp image of the luminescence emerges, an optical radiation through the transition of electrons to a low-energy ground level state.This makes it possible to locate and identify defects with a spatial resolution previously not known or achieved. The method established by the researchers is called ReBEL which stands for "Reverse Bias Electroluminescence". The research findings underscore that photovoltaics are a sustainable and environmentally friendly technology.
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Labels: efficiency, energy, solar
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