Zinc Thiolate Enables Bright Cu‐Deficient Cu‐In‐S/ZnS Quantum Dots

Hansen, Eric C.; Bertram, Sophie N.; Yoo, Jason J.; Bawendi, Moungi G.

doi:10.1002/smll.201901462

Title: Zinc Thiolate Enables Bright Cu‐Deficient Cu‐In‐S/ZnS Quantum Dots

Journal Article · 21 May 2019 · Small

DOI: https://doi.org/10.1002/smll.201901462 · OSTI ID:1515094

Hansen, Eric C. ^[1]; Bertram, Sophie N. ^[1]; Yoo, Jason J. ^[1];

^[1]

Department of Chemistry Massachusetts Institute of Technology 77 Massachusetts Avenue Cambridge MA 02139 USA

Abstract Copper indium sulfide (CIS) colloidal quantum dots (QDs) are a promising candidate for commercially viable QD‐based optical applications, for example as colloidal photocatalysts or in luminescent solar concentrators (LSCs). CIS QDs with good photoluminescence quantum yields (PLQYs) and tunable emission wavelength via size and composition control are previously reported. However, developing an understanding and control over the growth of electronically passivating inorganic shells would enable further improvements of the photophysical properties of CIS QDs. To improve the optical properties of CIS QDs, the focus is on the growth of inorganic shells via the popular metal‐carboxylate/alkane thiol decomposition reaction. 1) The role of Zn‐carboxylate and Zn‐thiolate on the formation of ZnS shells on Cu‐deficient CIS (CDCIS) QDs is studied, 2) this knowledge is leveraged to yield >90% PLQY CDCIS/ZnS core/shell QDs, and 3) a mechanism for ZnS shells grown from zinc‐carboxylate/alkane thiol decomposition is proposed.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: FG02-07ER46454

OSTI ID:: 1515094

Journal Information:: Small, Journal Name: Small Journal Issue: 27 Vol. 15; ISSN 1613-6810

Publisher:: Wiley Blackwell (John Wiley & Sons)Copyright Statement

Country of Publication:: Germany

Language:: English

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