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Microstructural evolution of mechanically deformed polycrystalline silicon for kerfless photovoltaics
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Wu, M. , Murphy, J. D., J. Jiang, J., Wilshaw, P. R. and Wilkinson, A. J. (2019) Microstructural evolution of mechanically deformed polycrystalline silicon for kerfless photovoltaics. Physica Status Solidi A, 216 (10). 1800578. doi:10.1002/pssa.201800578 ISSN 1862-6300.
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Official URL: https://doi.org/10.1002/pssa.201800578
Abstract
Silicon wafers for photovoltaics could be produced without kerf loss by rolling, provided sufficient control of defects such as dislocations can be achieved. A study using mainly high resolution electron backscatter diffraction (HR‐EBSD) of the microstructural evolution of Siemens polycrystalline silicon feedstock during a series of processes designed to mimic high temperature rolling is reported here. The starting material is heavily textured and annealing at 1400 °C results in 90% recrystallization and a reduction in average geometrically necessary dislocation (GND) density from >1014 to 1013 m−2. Subsequent compression at 1150 °C – analogous to rolling – produce sub‐grain boundaries seen as continuous curved high GND content linear features spanning grain interiors. Post‐deformation annealing at 1400 °C facilitates a secondary recrystallization process, resulting in large grains typically of 100 μm diameter. HR‐EBSD gives the final average GND density in as 3.2 × 1012 m−2. This value is considerably higher than the dislocation density of 5 × 1010 m−2 from etch pit counting, so the discrepancy is investigated by direct comparison of GND maps and etch pit patterns. The GND map from HR‐EBSD gives erroneously high values at the method's noise floor (≈1012 m−2) in regions with low dislocation densities.
Item Type: | Journal Article | ||||||||||||
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Subjects: | Q Science > QD Chemistry T Technology > TK Electrical engineering. Electronics Nuclear engineering |
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Divisions: | Faculty of Science, Engineering and Medicine > Engineering > Engineering | ||||||||||||
Library of Congress Subject Headings (LCSH): | Polycrystals, Microstructure, Silicon, Photovoltaic power generation, Electrons -- Backscattering, Diffraction | ||||||||||||
Journal or Publication Title: | Physica Status Solidi A | ||||||||||||
Publisher: | Wiley-VCH Verlag GMBH | ||||||||||||
ISSN: | 1862-6300 | ||||||||||||
Official Date: | 23 May 2019 | ||||||||||||
Dates: |
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Volume: | 216 | ||||||||||||
Number: | 10 | ||||||||||||
Article Number: | 1800578 | ||||||||||||
DOI: | 10.1002/pssa.201800578 | ||||||||||||
Status: | Peer Reviewed | ||||||||||||
Publication Status: | Published | ||||||||||||
Access rights to Published version: | Restricted or Subscription Access | ||||||||||||
Date of first compliant deposit: | 5 September 2018 | ||||||||||||
Date of first compliant Open Access: | 4 October 2019 | ||||||||||||
RIOXX Funder/Project Grant: |
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