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나노물질 및 화학반응 연구단
나노물질 및 화학반응 연구단
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Ultrastable PbSe nanocrystal quantum dots via in situ formation of atomically thin halide adlayers on PbSe(100)

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Title
Ultrastable PbSe nanocrystal quantum dots via in situ formation of atomically thin halide adlayers on PbSe(100)
Author(s)
Woo J.Y.; Jae-Hyeon Ko; Song J.H.; Kim K.; Choi H.; Yong-Hyun Kim; Lee D.C.; Jeong S.
Publication Date
2014-06
Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, v.136, no.25, pp.8883 - 8886
Publisher
AMER CHEMICAL SOC
Abstract
The fast degradation of lead selenide (PbSe) nanocrystal quantum dots (NQDs) in ambient conditions impedes widespread deployment of the highly excitonic, thus versatile, colloidal NQDs. Here we report a simple in situ post-synthetic halide salt treatment that results in size-independent air stability of PbSe NQDs without significantly altering their optoelectronic characteristics. From TEM, NMR, and XPS results and DFT calculations, we propose that the unprecedented size-independent air stability of the PbSe NQDs can be attributed to the successful passivation of under-coordinated PbSe(100) facets with atomically thin PbX2 (X = Cl, Br, I) adlayers. Conductive films made of halide-treated ultrastable PbSe NQDs exhibit markedly improved air stability and behave as an n-type channel in a field-effect transistor. Our simple in situ wet-chemical passivation scheme will enable broader utilization of PbSe NQDs in ambient conditions in many optoelectronic applications. © 2014 American Chemical Society.
URI
https://pr.ibs.re.kr/handle/8788114/1179
ISSN
0002-7863
Appears in Collections:
Center for Nanomaterials and Chemical Reactions(나노물질 및 화학반응 연구단) > Journal Papers (저널논문)
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