Long-Term Stability and Optoelectronic Performance Enhancement of InAsP Nanowires with an Ultrathin InP Passivation Layer.
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Authors
Chen, LuLu
Adeyemo, Stephanie O
Liu, Huiyun
Kar, Srabani
Yang, Hui
Velichko, Anton
Joyce, Hannah J
Publication Date
2022-04-27Journal Title
Nano Lett
ISSN
1530-6984
Publisher
American Chemical Society (ACS)
Volume
22
Issue
8
Pages
3433-3439
Language
eng
Type
Article
This Version
VoR
Metadata
Show full item recordCitation
Chen, L., Adeyemo, S. O., Fonseka, H. A., Liu, H., Kar, S., Yang, H., Velichko, A., et al. (2022). Long-Term Stability and Optoelectronic Performance Enhancement of InAsP Nanowires with an Ultrathin InP Passivation Layer.. Nano Lett, 22 (8), 3433-3439. https://doi.org/10.1021/acs.nanolett.2c00805
Description
Funder: Leverhulme Trust
Abstract
The influence of nanowire (NW) surface states increases rapidly with the reduction of diameter and hence severely degrades the optoelectronic performance of narrow-diameter NWs. Surface passivation is therefore critical, but it is challenging to achieve long-term effective passivation without significantly affecting other qualities. Here, we demonstrate that an ultrathin InP passivation layer of 2-3 nm can effectively solve these challenges. For InAsP nanowires with small diameters of 30-40 nm, the ultrathin passivation layer reduces the surface recombination velocity by at least 70% and increases the charge carrier lifetime by a factor of 3. These improvements are maintained even after storing the samples in ambient atmosphere for over 3 years. This passivation also greatly improves the performance thermal tolerance of these thin NWs and extends their operating temperature from <150 K to room temperature. This study provides a new route toward high-performance room-temperature narrow-diameter NW devices with long-term stability.
Keywords
long-term stability, photonic properties, surface passivation, thin nanowire, ultrathin InP
Sponsorship
European Research Council (716471)
Engineering and Physical Sciences Research Council (EP/P000916/1, EP/P006973/1, EP/P000886/1)
Identifiers
35420433, PMC9097579
External DOI: https://doi.org/10.1021/acs.nanolett.2c00805
This record's URL: https://www.repository.cam.ac.uk/handle/1810/337181
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