1Amorphous Semiconductor Research Laboratory, Department of Physics, M.M.M. Engineering College, Gorakhpur-273010 (UP)
2Department of Physics, Banasthali Vidyapeeth, Banasthali-304022 (Rajsthan)
*E-mail: dwivedidkphys@rediffmail.com
Online published on 10 August, 2015.
Optical characterizations of CdTe/HgTe/CdTe quantum-dot quantum-well (QDQW) nanoparticles synthesized by the colloidal method has been carried out. Strong exciton bands were observed in absorption and photoluminescence (PL) spectra taken for the CdTe/HgTe/CdTe QDQW nanoparticles. The energy difference between the exciton absorption and PL bands is larger than those obtained with CdTe and HgTe nanoparticles. Photocurrent-voltage curves and time-dependent photocurrent curves were obtained for the CdTe/HgTe/CdTe QDQW nanoparticles. It is observed that free holes in the HgTe quantum-well in the valance band, rather than free electrons, are the main contributors to the photocurrent.
CdTe/HgTe/CdTe nanoparticles, quantum-dot quantum-well, photocurrent, optical properties
