Facet-Specific Ligand Interactions on Ternary AgSbS2 Colloidal Quantum Dots

Joseph Luther, Matthew Beard, Hyekyoung Choi, Sungwoo Kim, Sang-Wook Kim, Dongwoon Shin, Sohee Jeong

Research output: Contribution to journalArticlepeer-review

16 Scopus Citations

Abstract

Silver dimetal chalcogenide (Ag-V-VI2) ternary quantum dots (QDs) are emerging lead-free materials for optoelectronic devices due to their NIR band gaps, large absorption coefficients, and superior electronic properties. However, thin film-based devices of the ternary QDs still lag behind due to the lack of understanding of the surface chemistry, compared to that of lead chalcogenide QDs even with the same crystal structure. Herein the surface ligand interactions of AgSbS2 QDs, synthesized with 1-dodecanethiol used as a stabilizer, are studied. For nonpolar (1 0 0) surfaces, it is suggested that the thiolate ligands are associated with the crystal lattices, thus preventing surface oxidation by protecting sulfur after air-exposure, as confirmed through optical and surface chemical analysis. Otherwise, silver rich (1 1 1) surfaces are passivated by thiolate ligands, allowing ligand exchange processes for the conductive films. This in-depth investigation of the surface chemistry of ternary QDs will prompt the performance enhancement of their optoelectronic devices.

Original languageAmerican English
Pages (from-to)17707-17713
Number of pages7
JournalChemistry - A European Journal
Volume23
Issue number70
DOIs
StatePublished - 2017

Bibliographical note

Publisher Copyright:
© 2017 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim

NREL Publication Number

  • NREL/JA-5900-70532

Keywords

  • AgSbS
  • I–V–VI
  • quantum dots
  • surface chemistry
  • ternary

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