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Superacid-treated silicon surfaces : extending the limit of carrier lifetime for photovoltaic applications

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Grant, Nicholas E., Niewelt, Tim, Wilson, Neil R., Wheeler-Jones, Evé, Bullock, James, Al-Amin, Mohammad, Schubert, Martin C., van Veen, André C., Javey, Ali and Murphy, John D. (2017) Superacid-treated silicon surfaces : extending the limit of carrier lifetime for photovoltaic applications. IEEE Journal of Photovoltaics, 7 (6). pp. 1574-1583. doi:10.1109/JPHOTOV.2017.2751511 ISSN 2156-3381.

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Official URL: http://doi.org/10.1109/JPHOTOV.2017.2751511

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Abstract

Minimizing carrier recombination at interfaces is of extreme importance in the development of high-efficiency photovoltaic devices and for bulk material characterization. Here, we investigate a temporary room temperature superacid-based passivation scheme, which provides surface recombination velocities below 1 cm/s, thus placing our passivation scheme amongst state-of-the-art dielectric films. Application of the technique to high-quality float-zone silicon allows the currently accepted intrinsic carrier lifetime limit to be reached and calls its current parameterization into doubt for 1 Ω·cm n-type wafers. The passivation also enables lifetimes up to 65 ms to be measured in high-resistivity Czochralski silicon, which, to our knowledge, is the highest ever measured in Czochralski-grown material. The passivation strategies developed in this work will help diagnose bulk lifetime degradation under solar cell processing conditions and also help quantify the electronic quality of new passivation schemes.

Item Type: Journal Article
Alternative Title:
Subjects: 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): Superacids, Photovoltaic power generation, Silicon crystals
Journal or Publication Title: IEEE Journal of Photovoltaics
Publisher: IEEE
ISSN: 2156-3381
Official Date: 3 October 2017
Dates:
DateEvent
3 October 2017Available
6 September 2017Accepted
Volume: 7
Number: 6
Page Range: pp. 1574-1583
DOI: 10.1109/JPHOTOV.2017.2751511
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
Date of first compliant deposit: 24 October 2017
Date of first compliant Open Access: 24 October 2017
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
EP/M024911/1Engineering and Physical Sciences Research Councilhttp://dx.doi.org/10.13039/501100000266
EP/P511079/1Engineering and Physical Sciences Research Councilhttp://dx.doi.org/10.13039/501100000266
EP/J01768X/2Engineering and Physical Sciences Research Councilhttp://dx.doi.org/10.13039/501100000266
RG100076Royal Societyhttp://dx.doi.org/10.13039/501100000288
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