Facet-Specific Ligand Interactions on Ternary AgSbS2 Colloidal Quantum Dots

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

doi:10.1002/chem.201703681

Title: Facet-Specific Ligand Interactions on Ternary AgSbS₂ Colloidal Quantum Dots

Journal Article · Tue Nov 07 00:00:00 EST 2017 · Chemistry - A European Journal

DOI:https://doi.org/10.1002/chem.201703681· OSTI ID:1409306

^[1]; Kim, Sungwoo ^[2]; Luther, Joseph M. ^[3]; Kim, Sang-Wook ^[1]; Shin, Dongwoon ^[4]; Beard, Matthew C. ^[3];

^[4]

Korea Inst. of Machinery and Materials, Daejeon (Korea, Republic of). Nano-Convergence Systems Research Division
Ajou Univ., Suwon (Republic of Korea). Dept. of Molecular Science and Technology
National Renewable Energy Lab. (NREL), Golden, CO (United States). Chemical and Materials Sciences Center
Korea Inst. of Machinery and Materials, Daejeon (Korea, Republic of). Nano-Convergence Systems Research Division; Korea Univ. of Science and Technology (UST), Daejeon (Republic of Korea). Dept. of Nanomechatronics

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. Here in this paper, 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.

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Research Organization:: National Renewable Energy Lab. (NREL), Golden, CO (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE); Korea Institute for Advancement of Technology (KIAT)

Grant/Contract Number:: AC36-08GO28308; NRF-2016R1A2B3014182; 2014R1A5A1009799

OSTI ID:: 1409306

Report Number(s):: NREL/JA-5900-70532

Journal Information:: Chemistry - A European Journal, Vol. 23, Issue 66; ISSN 0947-6539

Publisher:: ChemPubSoc EuropeCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 16 works

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Title: Facet-Specific Ligand Interactions on Ternary AgSbS2 Colloidal Quantum Dots

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Title: Facet-Specific Ligand Interactions on Ternary AgSbS₂ Colloidal Quantum Dots