Carrier Cooling in Colloidal Quantum Wells

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https://pubs.acs.org/doi/10.1021/nl302986y

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https://doi.org/10.1021/nl302986y
 http://hdl.handle.net/11603/29184

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UMBC Physics Department

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Author/Creator ORCID

https://orcid.org/0000-0002-6370-8765

Date

2012-11-08

Type of Work

journal articles
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Citation of Original Publication

Pelton, Matthew, Sandrine Ithurria, Richard D. Schaller, Dmitriy S. Dolzhnikov, and Dmitri V. Talapin. “Carrier Cooling in Colloidal Quantum Wells.” Nano Letters 12, no. 12 (December 12, 2012): 6158–63. https://doi.org/10.1021/nl302986y.

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This work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.
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Abstract

It has recently become possible to chemically synthesize atomically flat semiconductor nanoplatelets with monolayer-precision control over the platelet thickness. It has been suggested that these platelets are quantum wells; that is, carriers in these platelets are confined in one dimension but are free to move in the other two dimensions. Here, we report time-resolved photoluminescence and transient-absorption measurements of carrier relaxation that confirm the quantum-well nature of these nanomaterials. Excitation of the nanoplatelets by an intense laser pulse results in the formation of a high-temperature carrier population that cools back down to ambient temperature on the time scale of several picoseconds. The rapid carrier cooling indicates that the platelets are well-suited for optoelectronic applications such as lasers and modulators.