Carrier cooling in colloidal quantum wells

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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

81 Scopus citations


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 languageEnglish (US)
Pages (from-to)6158-6163
Number of pages6
JournalNano Letters
Issue number12
StatePublished - Dec 12 2012


  • Quantum wells
  • carrier relaxation
  • semiconductor nanocrystals

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

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