Method to fabricate multicrystal solar cell with light trapping surface using nanopore copolymer
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United States of America Patent
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Aug 12, 2014
Grant Date -
May 9, 2013
app pub date -
Nov 4, 2011
filing date -
Nov 4, 2011
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Abstract
Multi-crystalline silicon processing techniques are provided. In one aspect, a method for roughening a multi-crystalline silicon surface is provided. The method includes the following steps. The multi-crystalline silicon surface is coated with a diblock copolymer. The diblock copolymer is annealed to form nanopores therein. The multi-crystalline silicon surface is etched through the nanopores in the diblock copolymer to roughen the multi-crystalline silicon surface. The diblock copolymer is removed. A multi-crystalline silicon substrate with a roughened surface having a plurality of peaks and troughs is also provided, wherein a distance from one peak to an adjacent peak on the roughened surface is from about 20 nm to about 400 nm.
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