What is it about?
We demonstrate in this paper that the broadly used band gap gradient method to reduce recombination at the back contact in CIGS solar cell is not a gradual band gap change. Based on cathodoluminescence, photoluminescence and Raman spectroscopy, we show that instead of a gradient, discrete phases interlace in the bulk of the material leading to an apparent gradient.
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Why is it important?
In addition, we found that the high band gap phase that forms towards the back of the absorber is detrimental for the solar cell.
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This page is a summary of: Composition variations in Cu(In,Ga)(S,Se)2 solar cells: Not a gradient, but an interlaced network of two phases, APL Materials, October 2023, American Institute of Physics,
DOI: 10.1063/5.0165546.
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