Vapour growth and characterization of HgBr2 crystals using confocal laser scanning microscopy, optical spectroscopy and DC conductivity measurements

HgBr2 single crystals were grown from the vapour by the moving vapour growt h method. By optical spectroscopy measurements in the fundamental energy ga p region the energy gap value at room temperature RT was determined, and by electrical measurements the energy levels inside the energy gap were resol ved. Investigation of the crystals by a photoluminescence technique using a confocal laser scanning microscope using a Kr-Ar laser (488 nm/514 nm) con firmed the presence of internal inhomogeneities and gave information regard ing the position and dimension of the impurity regions in the crystals.