Mercury-Telluride Nanocrystalline Thin Films: A Unique Photoluminescence in the Visible Regime
Stoichiometric mercury-telluride (HgTe) nanocrystals, free from any foreign impurities, have been prepared by an electrochemical technique. Transmission electron microscopy and selected area diffraction studies confirm that the size of HgTe nanocrystals with cubic phase range from 4 – 7 nm and are preferentially oriented. Optical absorption studies indicate that the band gap of HgTe nanocrystals is 2.14 eV. Room temperature photoluminescence measurements show band edge and trap dominated luminescence in the visible regime. Micro-Raman scattering analysis of the HgTe nanocrystals sample reveals the 1LO Raman vibrational mode is at 142.5 cm-1suggesting a shift of 6 cm-1 from it’s bulk value and confirms the crystalline size to be small.
M. Gupta and Christina Y.H. Lim
S. Rath, S.N. Sahu, "Mercury-Telluride Nanocrystalline Thin Films: A Unique Photoluminescence in the Visible Regime", Journal of Metastable and Nanocrystalline Materials, Vol. 23, pp. 125-128, 2005