Journal
NANO LETTERS
Volume 12, Issue 12, Pages 6158-6163Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl302986y
Keywords
Quantum wells; semiconductor nanocrystals; carrier relaxation
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Funding
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences User Facility [DE-AC02-06CH11357]
- University of Chicago
- Department of Energy [DE.AC02-06CH11357]
- NSF MRSEC Program [DMR-0213745]
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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.
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