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Efficient light trapping in inverted nanopyramid thin crystalline silicon membranes for solar cell applications.
| Content Provider | Semantic Scholar |
|---|---|
| Author | Mavrokefalos, Anastassios Han, Sang Eon Yerci, Selcuk Branham, Matthew S. Chen, Gang |
| Copyright Year | 2012 |
| Abstract | Thin-film crystalline silicon (c-Si) solar cells with light-trapping structures can enhance light absorption within the semiconductor absorber layer and reduce material usage. Here we demonstrate that an inverted nanopyramid light-trapping scheme for c-Si thin films, fabricated at wafer scale via a low-cost wet etching process, significantly enhances absorption within the c-Si layer. A broadband enhancement in absorptance that approaches the Yablonovitch limit (Yablonovitch, E. J. Opt. Soc. Am.1987, 72, 899-907 ) is achieved with minimal angle dependence. We also show that c-Si films less than 10 μm in thickness can achieve absorptance values comparable to that of planar c-Si wafers thicker than 300 μm, amounting to an over 30-fold reduction in material usage. Furthermore the surface area increases by a factor of only 1.7, which limits surface recombination losses in comparison with other nanostructured light-trapping schemes. These structures will not only significantly curtail both the material and processing cost of solar cells but also allow the high efficiency required to enable viable c-Si thin-film solar cells in the future. |
| File Format | PDF HTM / HTML |
| DOI | 10.1021/nl2045777 |
| Alternate Webpage(s) | http://dspace.mit.edu/openaccess-disseminate/1721.1/86899 |
| PubMed reference number | 22612694 |
| Alternate Webpage(s) | https://doi.org/10.1021/nl2045777 |
| Journal | Medline |
| Volume Number | 12 |
| Issue Number | 6 |
| Journal | Nano letters |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
