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Epitaxially grown p‐type silicon wafers ready for cell efficiencies exceeding 25%
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Rittmann, Clara, Schindler, Florian, Richter, Armin, Niewelt, Tim, Stolzenburg, Hannah, Steinhauser, Bernd, Dalke, Jonas, Drießen, Marion, Weiss, Charlotte, Janz, Stefan and Schubert, Martin C. (2022) Epitaxially grown p‐type silicon wafers ready for cell efficiencies exceeding 25%. Solar RRL . 2200698. doi:10.1002/solr.202200698 ISSN 2367-198X. (In Press)
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Solar RRL - 2022 - Rittmann - Epitaxially Grown p‐type Silicon Wafers Ready for Cell Efficiencies Exceeding 25.pdf - Published Version - Requires a PDF viewer. Available under License Creative Commons Attribution 4.0. Download (4Mb) | Preview |
Official URL: https://doi.org/10.1002/solr.202200698
Abstract
Combining the advantages of a high‐efficiency solar cell concept and a low carbon footprint base material is a promising approach for highly efficient, sustainable, and cost‐effective solar cells. In this work, we investigate the suitability of epitaxially grown p‐type silicon wafers for solar cells with tunnel oxide passivating contact rear emitter. As a first proof of principle, an efficiency limiting bulk recombination analysis of epitaxially grown p‐type silicon wafers deposited on high quality substrates (EpiRef) unveils promising cell efficiency potentials exceeding 25% for three different base resistivities of 3, 14, and 100 Ω cm. To understand the remaining limitations in detail, concentrations of metastable defects Fe i , CrB and BO are assessed by lifetime‐calibrated photoluminescence imaging and their impact on the overall recombination is evaluated. The EpiRef wafers’ efficiency potential is tracked along the solar cell fabrication process to quantify the impact of high temperature treatments on the material quality. We observe large areas with few structural defects on the wafer featuring lifetimes exceeding 10 ms and an efficiency potential of 25.8% even after exposing the wafer to a thermal oxidation at 1050 °C.
| Item Type: | Journal Article | ||||||
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| Subjects: | T Technology > TK Electrical engineering. Electronics Nuclear engineering | ||||||
| Divisions: | Faculty of Science, Engineering and Medicine > Engineering > Engineering | ||||||
| SWORD Depositor: | Library Publications Router | ||||||
| Library of Congress Subject Headings (LCSH): | Solar batteries, Solar cells, Epitaxy, Crystal growth | ||||||
| Journal or Publication Title: | Solar RRL | ||||||
| Publisher: | Wiley-VCH Verlag GmbH & Co. KGaA | ||||||
| ISSN: | 2367-198X | ||||||
| Official Date: | 3 November 2022 | ||||||
| Dates: |
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| Article Number: | 2200698 | ||||||
| DOI: | 10.1002/solr.202200698 | ||||||
| Status: | Peer Reviewed | ||||||
| Publication Status: | In Press | ||||||
| Reuse Statement (publisher, data, author rights): | ** Article version: VoR ** From Wiley via Jisc Publications Router ** History: received 29-07-2022; rev-recd 16-09-2022; pub-electronic 03-11-2022. ** Licence for VoR version of this article: http://creativecommons.org/licenses/by/4.0/ | ||||||
| Access rights to Published version: | Open Access (Creative Commons) | ||||||
| Copyright Holders: | © 2022 The Authors. Solar RRL published by Wiley-VCH GmbH | ||||||
| Date of first compliant deposit: | 7 December 2022 | ||||||
| Date of first compliant Open Access: | 7 December 2022 | ||||||
| RIOXX Funder/Project Grant: |
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