Radiative emission from Cu2ZnSnS4/ZnSn core/shell nanocrystals. Issue 20 (7th May 2019)

• Record Type: Journal Article
• Authors: Irkhina, A.; Levcenko, S.; Xie, L.; Leifer, K.; Unold, T.
• Is Part Of: Journal of materials chemistry. Volume 7:Issue 20(2019)
• Page Start: 6129
• Page End: 6133
• Publication Date: 2019-05-07
• Subjects: Materials -- Periodicals; Chemistry, Analytic -- Periodicals; Optical materials -- Research -- Periodicals; Electronics -- Materials -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c9tc00904c
• Languages: English
• ISSNs: 2050-7526

Abstract

Abstract : The authors experimentally demonstrate that passivation of the Cu2 ZnSnS4 nanocrystals by a ZnSn shell can activate the radiative emission. Abstract : Kesterite Cu2 ZnSnS4 (CZTS) nanocrystals so far have been found to luminesce neither at room temperature nor at low temperature. Here a core–shell architecture for kesterite CZTS nanocrystals is demonstrated by applying a ZnSn-alloy shell overcoating approach. These CZTS/ZnSn nanocrystals show luminescence emission at 1.05 eV, which is red-shifted by about 0.4 eV from the absorption onset and is attributed to a radiative transition involving a deep defect. Temperature-dependent photoluminescence measurements within a range of 20–200 K indicate the presence of a competing nonradiative channel with an activation energy of 50–60 meV.