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Facet‐Specific Ligand Interactions on Ternary AgSbS 2 Colloidal Quantum Dots
Author(s) -
Choi Hyekyoung,
Kim Sungwoo,
Luther Joseph M.,
Kim SangWook,
Shin Dongwoon,
Beard Matthew C.,
Jeong Sohee
Publication year - 2017
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201703681
Subject(s) - quantum dot , facet (psychology) , ternary operation , ligand (biochemistry) , colloid , materials science , nanocrystal , nanotechnology , chemistry , computer science , psychology , receptor , biochemistry , personality , big five personality traits , programming language , social psychology
Silver dimetal chalcogenide (Ag‐V‐VI 2 ) 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 AgSbS 2 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.