Carrier cooling in colloidal quantum wells

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

Research output: Contribution to journalArticle

66 Citations (Scopus)

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 languageEnglish
Pages (from-to)6158-6163
Number of pages6
JournalNano letters
Volume12
Issue number12
DOIs
Publication statusPublished - Dec 12 2012

Keywords

  • 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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  • Cite this

    Pelton, M., Ithurria, S., Schaller, R. D., Dolzhnikov, D. S., & Talapin, D. V. (2012). Carrier cooling in colloidal quantum wells. Nano letters, 12(12), 6158-6163. https://doi.org/10.1021/nl302986y