Ultrafast carrier trapping in thick-shell colloidal quantum dots

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DOIResolve DOI: http://doi.org/10.1021/acs.jpclett.7b01503
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TypeArticle
Journal titleThe Journal of Physical Chemistry Letters
ISSN1948-7185
Volume8
Issue14
Pages31793184
AbstractIt has previously been found that Auger processes can lead to femtosecond carrier trapping in quantum dots, limiting their performance in optoelectronic applications that rely on radiative recombination. Using atomistic simulations, we investigate whether a shell can protect carriers from Auger-assisted trapping. For these studies we investigate CdSe/CdS core–shell quantum dots having total diameters reaching up to 10 nm. We find trapping lifetimes as fast as 1 ps for 2 nm shells, and we report that shells as thick as 6 nm are required to suppress trapping fully. The most efficient recombination mechanism is found to proceed through shallow empty traps, suggesting it can be suppressed by filling the traps through doping or external electrochemical potential. Our findings suggest that to achieve efficient light emission, surface traps have to be completely eliminated, even in thick-shell quantum dots.
Publication date
PublisherAmerican Chemical Society
LanguageEnglish
AffiliationSecurity and Disruptive Technologies; National Research Council Canada
Peer reviewedYes
NPARC number23002296
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Record identifierccf3b48d-d77c-4a0b-880d-9ba271f59f3b
Record created2017-10-11
Record modified2017-10-11
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