Carrier dynamics in highly quantum-confined, colloidal indium antimonide nanocrystals

Angela Y. Chang, Wenyong Liu, Dmitri V. Talapin, Richard D. Schaller

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Nanometer-sized particles of indium antimonide (InSb) offer opportunities in areas such as solar energy conversion and single photon sources. Here, we measure electron-hole pair dynamics, spectra, and absorption cross sections of strongly quantum-confined colloidal InSb nanocrystal quantum dots using femtosecond transient absorption. For all samples, we observe a bleach feature that develops on ultrafast time scales, which notably moves to lower energy during the first several picoseconds following excitation. We associate this unusual red shift, which becomes larger for larger particles and more distinct at lower sample temperatures, with hot exciton cooling through states that we suggest arise from energetically proximal conduction band levels. From controlled optical excitation intensities, we determine biexciton lifetimes, which range from 2 to 20 ps for the studied 3-6 nm diameter particle sizes.

Original languageEnglish
Pages (from-to)8513-8519
Number of pages7
JournalACS nano
Volume8
Issue number8
DOIs
Publication statusPublished - Jan 1 2014

    Fingerprint

Keywords

  • Auger recombination
  • InSb
  • indium antimonide
  • intraband relaxation
  • nanocrystal quantum dots
  • semiconductor nanocrystals
  • transient absorption

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

Cite this