Transient Lattice Response upon Photoexcitation in CuInSe2 Nanocrystals with Organic or Inorganic Surface Passivation

Samantha M. Harvey, Daniel W. Houck, Matthew S. Kirschner, Nathan C. Flanders, Alexandra Brumberg, Ariel A. Leonard, Nicolas E. Watkins, Lin X Chen, William Dichtel, Xiaoyi Zhang, Brian A. Korgel, Michael R. Wasielewski, Richard D. Schaller

Research output: Contribution to journalArticlepeer-review

Abstract

CuInSe2 nanocrystals offer promise for optoelectronics including thin-film photovoltaics and printed electronics. Additive manufacturing methods such as photonic curing controllably sinter particles into quasi-continuous films and offer improved device performance. To gain understanding of nanocrystal response under such processing conditions, we investigate impacts of photoexcitation on colloidal nanocrystal lattices via time-resolved X-ray diffraction. We probe three sizes of particles and two capping ligands (oleylamine and inorganic S2-) to evaluate resultant crystal lattice temperature, phase stability, and thermal dissipation. Elevated fluences produce heating and loss of crystallinity, the onset of which exhibits particle size dependence. We find size-dependent recrystallization and cooling lifetimes ranging from 90 to 200 ps with additional slower cooling on the nanosecond time scale. Sulfide-capped nanocrystals show faster recrystallization and cooling compared to oleylamine-capped nanocrystals. Using these lifetimes, we find interfacial thermal conductivities from 3 to 28 MW/(m2 K), demonstrating that ligand identity strongly influences thermal dissipation.

Original languageEnglish (US)
Pages (from-to)13548-13556
Number of pages9
JournalACS nano
Volume14
Issue number10
DOIs
StatePublished - Oct 27 2020

Keywords

  • CuInSe2
  • heat dissipation
  • ligand
  • melting
  • time-resolved X-ray diffraction

ASJC Scopus subject areas

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

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