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Low-temperature saw damage gettering to improve minority carrier lifetime in multicrystalline silicon
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Al-Amin, Mohammad, Grant, Nicholas E. and Murphy, John D. (2017) Low-temperature saw damage gettering to improve minority carrier lifetime in multicrystalline silicon. Physica Status Solidi Rapid Research Letters, 11 (10). 1700268.
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Official URL: https://doi.org/10.1002/pssr.201700268
Abstract
The minority carrier lifetime in multicrystalline silicon − a material used in the majority of today's manufactured solar cells − is limited by defects within the material, including metallic impurities which are relatively mobile at low temperatures (≤700 °C). Addition of an optimised thermal process which can facilitate impurity diffusion to the saw damage at the wafer surfaces can result in permanent removal of the impurities when the saw damage is etched away. We demonstrate that this saw damage gettering is effective at 500 to 700 °C and, when combined with subsequent low-temperature processing, lifetimes are improved by a factor of more than four relative to the as-grown state. The simple method has the potential to be a low thermal budget process for the improvement of low-lifetime “red zone” wafers.
| Item Type: | Journal Article | ||||||||||||||||||
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| Subjects: | T Technology > TK Electrical engineering. Electronics Nuclear engineering | ||||||||||||||||||
| Divisions: | Faculty of Science > Engineering | ||||||||||||||||||
| Library of Congress Subject Headings (LCSH): | Silicon solar cells, Getters, Silicon crystals, Aluminum alloys | ||||||||||||||||||
| Journal or Publication Title: | Physica Status Solidi Rapid Research Letters | ||||||||||||||||||
| Publisher: | Wiley | ||||||||||||||||||
| ISSN: | 1862-6270 | ||||||||||||||||||
| Official Date: | October 2017 | ||||||||||||||||||
| Dates: |
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| Volume: | 11 | ||||||||||||||||||
| Number: | 10 | ||||||||||||||||||
| Article Number: | 1700268 | ||||||||||||||||||
| Status: | Peer Reviewed | ||||||||||||||||||
| Publication Status: | Published | ||||||||||||||||||
| Access rights to Published version: | Open Access | ||||||||||||||||||
| RIOXX Funder/Project Grant: |
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