Oscillatory Regularity of Charge Carrier Trap Energy Spectra in ZnSe Single Crystals

V. Degoda a, A. Gumenjuk b, N. Pavlova c, A. Sofiienkod and S. Sulima e aTaras Shevchenko National University of Kyiv, Volodymyrs'ka 64, 01601 Kyiv, Ukraine bInstitute of Physics of the National Academy of Science of Ukraine, Nauky ave. 46, 03028 Kyiv, Ukraine cNational Pedagogical Dragomanov University, Pirogova 9, 01030 Kyiv, Ukraine dUniversity of Bergen, Allegaten 55, PO Box 7803, 5020 Bergen, Norway eInstitute for Single Crystals of the National Academy of Science of Ukraine, Lenin ave. 60 61001 Kharkiv, Ukraine

Received: April 23, 2015; In final form: February 22, 2016

Full Text PDF

This article presents the results of an experimental investigation of the energy spectra of charge carrier traps in undoped high-resistivity ZnSe single crystals. Fourteen peaks were found in the thermostimulated luminescence spectra of the ZnSe samples at temperatures between 8 K and 450 K, and the thermal activation energies of the charge carrier traps were estimated for the most intense peaks. It was found that the energy spectra of the charge carrier traps in ZnSe exhibit oscillatory regularity, and the energy of a vibrational quantum was estimated to be ħω = 206 cm-1, which is in good agreement with the vibrational mode in the Raman spectrum. Additionally, a linear relationship was observed between the thermal activation energies of the charge carrier traps and the temperature positions of the maxima in the thermostimulated luminescence of ZnSe.

DOI: 10.12693/APhysPolA.129.304 PACS numbers: 64.70.kg, 68.55.ag, 07.77.Ka