M. T. Harrison, S. V. Kershaw, A. L. Rogach, A. Kornowski, A. Eychmüller and H. Weller
Version of Record online: 29 DEC 1999 | DOI: 10.1002/(SICI)1521-4095(200001)12:2<123::AID-ADMA123>3.0.CO;2-H
Very strong, broad photoluminescence (PL) in the near infrared is displayed by colloidal HgTe nanocrystals. However, they are not stable over time—the PL moves to longer wavelengths, accompanied by an apparent drop in the quantum efficiency—which causes concern for the use of these materials in device applications. Here, capping of the HgTe nanocrystals with a layer of CdS, in order to produce a physically stable core/shell heterostructure, is reported. Optical absorption, PL, X-ray diffraction, and high-resolution TEM are used to characterize the resulting HgTe/CdS material.