Carrier cooling in colloidal quantum wells

Matthew Pelton; Sandrine Ithurria; Richard Daniel Schaller; Dmitriy S. Dolzhnikov; Dmitri V. Talapin

doi:10.1021/nl302986y

Carrier cooling in colloidal quantum wells

Matthew Pelton^*, Sandrine Ithurria, Richard Daniel Schaller, Dmitriy S. Dolzhnikov, Dmitri V. Talapin

^*Corresponding author for this work

Chemistry

Research output: Contribution to journal › Article › peer-review

109 Scopus citations

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.

Original language	English (US)
Pages (from-to)	6158-6163
Number of pages	6
Journal	Nano letters
Volume	12
Issue number	12
DOIs	https://doi.org/10.1021/nl302986y
State	Published - Dec 12 2012

Keywords

Quantum wells
carrier relaxation
semiconductor nanocrystals

ASJC Scopus subject areas

General Chemistry
Condensed Matter Physics
Mechanical Engineering
Bioengineering
General Materials Science

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10.1021/nl302986y

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title = "Carrier cooling in colloidal quantum wells",

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.",

keywords = "Quantum wells, carrier relaxation, semiconductor nanocrystals",

author = "Matthew Pelton and Sandrine Ithurria and Schaller, {Richard Daniel} and Dolzhnikov, {Dmitriy S.} and Talapin, {Dmitri V.}",

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doi = "10.1021/nl302986y",

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TY - JOUR

T1 - Carrier cooling in colloidal quantum wells

AU - Pelton, Matthew

AU - Ithurria, Sandrine

AU - Schaller, Richard Daniel

AU - Dolzhnikov, Dmitriy S.

AU - Talapin, Dmitri V.

PY - 2012/12/12

Y1 - 2012/12/12

N2 - 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.

AB - 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.

KW - Quantum wells

KW - carrier relaxation

KW - semiconductor nanocrystals

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Carrier cooling in colloidal quantum wells

Abstract

Keywords

ASJC Scopus subject areas

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