title: Highly Luminescent, Size- and Shape-Tunable Copper Indium Selenide Based Colloidal Nanocrystals.
abstract: We report a simple, high-yield colloidal synthesis of copper indium selenide nanocrystals (CISe NCs) based on a silylamide-promoted approach. The silylamide anions increase the nucleation rate, which results in small-sized NCs exhibiting high luminescence and constant NC stoichiometry and crystal structure regardless of the NC size and shape. In particular, by systematically varying synthesis time and temperature, we show that the size of the CISe NCs can be precisely controlled to be between 2.7 and 7.9 nm with size distributions down to 9-10%. By introducing a specific concentration of silylamide-anions in the reaction mixture, the shape of CISe NCs can be preselected to be either spherical or tetrahedral. Optical properties of these CISe NCs span from the visible to near-infrared region with peak luminescence wavelengths of 700 to 1200 nm. The luminescence efficiency improves from 10 to 15% to record values of 50-60% by overcoating as-prepared CISe NCs with ZnSe or ZnS shells, highlighting their potential for applications such as biolabeling and solid state lighting.
authors.affiliation: Department of Information Technology and Electrical Engineering, ETH Zurich , Gloriastr. 35, 8092 Zurich, Switzerland.
authors.forename: Olesya
authors.initials: O
authors.lastname: Yarema
authors.affiliation: Department of Information Technology and Electrical Engineering, ETH Zurich , Gloriastr. 35, 8092 Zurich, Switzerland.
authors.forename: Deniz
authors.initials: D
authors.lastname: Bozyigit
authors.affiliation: Department of Information Technology and Electrical Engineering, ETH Zurich , Gloriastr. 35, 8092 Zurich, Switzerland.
authors.forename: Ian
authors.initials: I
authors.lastname: Rousseau
authors.affiliation: Department of Information Technology and Electrical Engineering, ETH Zurich , Gloriastr. 35, 8092 Zurich, Switzerland.
authors.forename: Lea
authors.initials: L
authors.lastname: Nowack
authors.affiliation: Institute of Semiconductor and Solid State Physics, University Linz , Altenbergerstr. 69, 4040 Linz, Austria.
authors.forename: Maksym
authors.initials: M
authors.lastname: Yarema
authors.affiliation: Institute of Semiconductor and Solid State Physics, University Linz , Altenbergerstr. 69, 4040 Linz, Austria.
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Heiss
authors.affiliation: Department of Information Technology and Electrical Engineering, ETH Zurich , Gloriastr. 35, 8092 Zurich, Switzerland.
authors.forename: Vanessa
authors.initials: V
authors.lastname: Wood
keywords: CISe nanocrystals; copper indium selenide; lighting applications; luminescence; quantum dot colloids; size and shape control
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