Fan, Xiang-Bing, Shin, Dong-Wook, Lee, Sanghyo, Ye, Junzhi, Yu, Shan, Morgan, David John ORCID: https://orcid.org/0000-0002-6571-5731, Arbab, Adrees, Yang, Jiajie, Jo, Jeong-Wan, Kim, Yoonwoo, Jung, Sung-Min, Davies, Philip Rosser ORCID: https://orcid.org/0000-0003-4394-766X, Rao, Akshay, Hou, Bo ORCID: https://orcid.org/0000-0001-9918-8223 and Kim, Jong Min 2023. InP/ZnS quantum dots photoluminescence modulation via in situ H2S interface engineering. Nanoscale Horizons 8 (4) , pp. 522-529. 10.1039/D2NH00436D |
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Abstract
InP quantum dots (QDs) are attracting significant interest as a potentially less toxic alternative to Cd-based QDs in many research areas. Although InP-based core/shell QDs with excellent photoluminescent properties have been reported so far, sophisticated interface treatment to eliminate defects is often necessary. Herein, using aminophosphine as a seeding source of phosphorus, we find that H2S can be efficiently generated from the reaction between thiol and alkylamine at high temperature. Apart from general comprehending that H2S act as an S precursor, it is revealed that with core etching by H2S, the interface between InP and ZnS can be reconstructed with S2- incorporation. Such a transition layer can reduce inherent defects at the interface, resulting in significant photoluminescence (PL) enhancement. Meanwhile, the size of the InP core could be further controlled by H2S etching, which offers a feasible process to obtain wide band gap InP-based QDs with blue emission.
Item Type: | Article |
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Date Type: | Publication |
Status: | Published |
Schools: | Chemistry Physics and Astronomy |
Publisher: | Royal Society of Chemistry |
ISSN: | 2055-6756 |
Date of First Compliant Deposit: | 22 January 2023 |
Date of Acceptance: | 17 January 2023 |
Last Modified: | 06 Nov 2024 14:47 |
URI: | https://orca.cardiff.ac.uk/id/eprint/156167 |
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