Abstract
Facile phase selective synthesis of CuInS2 (CIS) nanostructures has been an important pursuit because of the opportunity for tunable optical properties of the phases, and in this respect is investigated by hot-injection colloidal synthesis in this study. Relatively monodispersed colloidal quantum dots (3.8–5.6 nm) of predominantly chalcopyrite structure synthesized at 140, 180 and 210 °C over 60 minutes from copper(ii) hexafluoroacetylacetonate hydrate and indium(iii) diethyldithiocarbamate precursors exhibit temperature-dependent structural variability. The slightly off-stoichiometric quantum dots are copper-deficient in which copper vacancies , indium interstitials , indium–copper anti-sites and surface trapping states are likely implicated in broad photoluminescence emission with short radiative lifetimes, τ1, τ2, and τ3 of 1.5–2.1, 7.8–13.9 and 55.2–70.8 ns and particle-size dependent tunable band gaps between 2.25 and 2.32 eV. Further structural and optical tunability (Eg between 2.03 and 2.28 eV) is achieved with possible time-dependent wurtzite to chalcopyrite phase transformation at 180 °C likely involving a dynamic interplay of kinetic and thermodynamic factors.
Highlights
Multinary copper chalcogenide nanocrystals (NCs) such as copper indium sulphide (CuInS2) are an extraordinarily interesting class of materials
Though CIS NCs have been studied by several research groups, part of the challenge has been the need for optimised synthetic protocols to and effectively control composition, stoichiometry, structure and particle size, and these efforts continue to be worthwhile pursuits within the scope of semiconductor materials engineering
Reported are structural and optical properties of fairly monodispersed colloidal CIS quantum dots (QDs) synthesized via hot injection involving copper(II) hexa uoroacetylacetonate hydrate and indium(III) diethyldithiocarbamate precursors at moderate temperatures
Summary
Multinary copper chalcogenide nanocrystals (NCs) such as copper indium sulphide (CuInS2) are an extraordinarily interesting class of materials. Further structural and optical tunability (Eg between 2.03 and 2.28 eV) is achieved with possible time-dependent wurtzite to chalcopyrite phase transformation at 180 C likely involving a dynamic interplay of kinetic and thermodynamic factors.
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