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Combining low-temperature gettering with phosphorus diffusion gettering for improved multicrystalline silicon

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Al-Amin, Mohammad and Murphy, John D. (2017) Combining low-temperature gettering with phosphorus diffusion gettering for improved multicrystalline silicon. IEEE Journal of Photovoltaics, 7 (6). 1519 -1527. doi:10.1109/JPHOTOV.2017.2741100 ISSN 2156-3381.

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Official URL: http://doi.org/10.1109/JPHOTOV.2017.2741100

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Abstract

We have investigated low-temperature (≤500 °C) gettering in combination with phosphorus diffusion gettering with a view to improving poor quality multicrystalline silicon. Low-temperature gettering applied after standard phosphorus diffusion gettering is found to provide a >40% improvement in minority carrier lifetime in samples from the top and bottom of an ingot. The best results are achieved at 300 °C with very long annealing times (>24 h). Improvements in the lifetime do not correlate with changes in interstitial iron concentration. Experiments are performed to assess whether the presence of a phosphorus-diffused emitter affects low-temperature gettering, and results from sister samples show the low-temperature gettering behavior is not affected by the existence of an emitter. Further experiments show that low-temperature gettering prior to phosphorus diffusion results in a 20% higher lifetime after phosphorus diffusion. Low-temperature gettering can, therefore, enhance lifetime even when used in conjunction with standard phosphorus diffusion gettering.

Item Type: Journal Article
Subjects: Q Science > QC Physics
Q Science > QD Chemistry
T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions: Faculty of Science, Engineering and Medicine > Engineering > Engineering
Library of Congress Subject Headings (LCSH): Phosphorus -- Diffusion rate, Phosphorus -- Effect of low temperatures on, Low temperatures, Getters, Silicon crystals
Journal or Publication Title: IEEE Journal of Photovoltaics
Publisher: IEEE
ISSN: 2156-3381
Official Date: November 2017
Dates:
DateEvent
November 2017Published
6 September 2017Available
12 August 2017Accepted
Volume: 7
Number: 6
Page Range: 1519 -1527
DOI: 10.1109/JPHOTOV.2017.2741100
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Open Access (Creative Commons)
Date of first compliant deposit: 24 October 2017
Date of first compliant Open Access: 24 October 2017
Grant number:
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
EP/J01768X/2[EPSRC] Engineering and Physical Sciences Research Councilhttp://dx.doi.org/10.13039/501100000266
EP/M024911/1[EPSRC] Engineering and Physical Sciences Research Councilhttp://dx.doi.org/10.13039/501100000266
EP/P511079/1[EPSRC] Engineering and Physical Sciences Research Councilhttp://dx.doi.org/10.13039/501100000266
RG100076[RS] Royal Societyhttp://dx.doi.org/10.13039/501100000288
UNSPECIFIEDRoyal Academy of Engineeringhttp://dx.doi.org/10.13039/501100000287
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