Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/156909
Title: Surface depletion effects in bromide-ligated colloidal cadmium selenide nanoplatelets: toward efficient emission at high temperature
Authors: Zhang, Zitong
Thung, Yi Tian
Wang, Lin
Chen, Xiaoxuan
Ding, Lu
Fan, Weijun
Sun, Handong
Keywords: Engineering::Materials::Photonics and optoelectronics materials
Issue Date: 2021
Source: Zhang, Z., Thung, Y. T., Wang, L., Chen, X., Ding, L., Fan, W. & Sun, H. (2021). Surface depletion effects in bromide-ligated colloidal cadmium selenide nanoplatelets: toward efficient emission at high temperature. Journal of Physical Chemistry Letters, 12(37), 9086-9093. https://dx.doi.org/10.1021/acs.jpclett.1c02623
Project: NRF-CRP21-2018-0092
NRFCRP23-2019-0007
AME-IRGA20E5c0083
RG95/19 (S)
Journal: Journal of Physical Chemistry Letters
Abstract: The colloidal semiconductor nanoplatelet (NPL) with broad ligand-semiconductor interface is an ideal system for surface science investigation, but the study regarding depletion effects in NPLs remains lacking. Herein we explore such effects in colloidal CdSe NPLs through Br ligation. Apart from improved brightness and red-shifted optical features, we also experimentally observed abnormal negative thermal quenching phenomena in bromideligated CdSe NPLs over 200 K under a cryogenic environment and up to 383 K under an ambient environment, which was absent in pristine NPLs. We speculate that the surface depletion effect shall account for these anomalous phenomena due to the susceptibility of the surface depletion region on photoexcited carrier concentration and surface condition. The existence of the depletion layer in NPLs is also validated quantitatively with k·p simulation. Besides offering an alternative explanation on the red-shifted optical properties of CdSe NPLs by Br-ligation, our findings pave the new route toward solution-processed NPLs-based optoelectronics with boosted thermal resistance.
URI: https://hdl.handle.net/10356/156909
ISSN: 1948-7185
DOI: 10.1021/acs.jpclett.1c02623
Rights: This document is the Accepted Manuscript version of a Published Work that appeared in final form in Journal of Physical Chemistry Letters, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acs.jpclett.1c02623.
Fulltext Permission: embargo_20220930
Fulltext Availability: With Fulltext
Appears in Collections:EEE Journal Articles
SPMS Journal Articles

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  Until 2022-09-30
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