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dc.contributor.authorHilali, Mohamed M.
dc.contributor.authorDamiani, Benjamin Mark
dc.contributor.authorRohatgi, Ajeet
dc.date.accessioned2008-12-18T21:04:47Z
dc.date.available2008-12-18T21:04:47Z
dc.date.issued2001-08
dc.identifier.urihttp://hdl.handle.net/1853/26259
dc.descriptionPresented at the 11th Workshop on Crystalline Silicon Solar Cell Materials and Processes; Estes Park, Colorado; August 19-22, 2001.en
dc.description.abstractPorous silicon (PS) induced lifetime enhancement was investigated in dendritic web and string ribbon silicon. As-grown lifetime in web was <1 µs, which improved by a factor of 3.27 due to 860 degrees C/2 min heat treatment. The same heat treatment after PS formation increased the lifetime by a factor of 8.33, indicating that PS alone is quite effective in raising the lifetime of web. Al gettering by itself raised the lifetime of as-grown web by a factor of 15, but the simultaneous annealing heat treatment increased the lifetime by a factor of 42, indicating a positive synergistic interaction between PS and Al. Finally, simultaneous phosphorus and Al diffusion, after PS formation, raised the as-grown web lifetime by a factor of 58. String ribbon Si, which has a low oxygen content and responds more favorably to hydrogenation, did not show much improvement due to PS+Al. Instead it showed greater response to SiN+Al treatment, suggesting that Al+PS induced lifetime enhancement is due to gettering and not hydrogenation. Screen-printed PS coated 100 µm web cells were formed by a single step firing and back diffusion with efficiency of 12 %. Cell analysis showed that process optimization can raise that efficiency by 2-3 % absolute.en
dc.language.isoen_USen
dc.publisherGeorgia Institute of Technologyen
dc.subjectSolar cellsen
dc.subjectSilicon solar cellsen
dc.subjectHydrogenationen
dc.titleLifetime Enhancement During Processing of Porous Silicon Cellsen
dc.typeProceedingsen
dc.contributor.corporatenameGeorgia Institute of Technology. University Center of Excellence for Photovoltaic Research and Education


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