Details

Autor(en) / Beteiligte

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

Titel

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

Ist Teil von

• Small (Weinheim an der Bergstrasse, Germany), 2019-07, Vol.15 (27), p.e1901462-n/a

Ort / Verlag

Germany: Wiley Subscription Services, Inc

Erscheinungsjahr

2019

Quelle

Wiley Online Library - AutoHoldings Journals

Beschreibungen/Notizen

• 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. Zn‐thiolate (Zn(RS)2) favors formation of a Zn‐In‐S alloy when used to grow a ZnS shell on Cu‐In‐S quantum dots (QDs). Utilizing Zn‐thiolate, a graded shell is grown on Cu‐In‐S QDs to realize >90% record quantum yields.