Photoinduced carrier dynamics of nearly stoichiometric oleylamine-protected copper indium sulfide nanoparticles and nanodisks

Masanori Sakamoto, Lihui Chen, Makoto Okano, David M. Tex, Yoshihiko Kanemitsu, Toshiharu Teranishi

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)

Abstract

Copper indium sulfide (CuInS2) nanocrystals (NCs) are nontoxic and cost-effective, making them attractive for use in highly efficient solar cells. However, direct observations of the photoinduced carrier dynamics of CuInS2 NCs to examine the relationship between carrier dynamics and structural parameters with the aim of optimizing NC properties for specific applications are limited. Here, we synthesized nearly stoichiometric oleylamine-protected CuInS2 NCs using two convenient one-pot methods to produce CuInS2 nanoparticles and nanodisks. Transient absorption measurements using femtosecond laser flash photolysis revealed that the use of oleylamine as a protecting ligand leads to the formation of vacancy-doped NCs. The rapid decay of the photogenerated excitons in the oleylamine-protected NCs was not sensitive to the crystal structure or shape of NCs, and could be explained by defect trapping and energy transfer to the hole-based localized surface plasmon resonance in the oleylamine-protected NCs. Our results confirm that careful selection of a protecting ligand is important to obtain CuInS2 NCs with optimized properties for particular applications.

Original languageEnglish
Pages (from-to)11100-11105
Number of pages6
JournalJournal of Physical Chemistry C
Volume119
Issue number20
DOIs
Publication statusPublished - 2015 May 21
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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