Electrical and optical measurements obtained with CdSe single crystals doped with chromium from a gas source CrSe over a wide temperature range (500-1050 °C) are compared with ZnSe annealed in liquid metal (Zn). These processes are intended to control the concentrations of the impurity and intrinsic defects. The low temperature annealing of CdSe crystals in CrSe atmosphere allows obtaining high electron mobility up to 9000 cm2/Vs at 80 K and demonstrates the low native defect concentration. A high temperature annealing gives rise to increased electron concentration with decreased mobility, Optical absorption measurements show that at the high annealing temperature effective doping with Cr takes place. The impurity absorption beyond the absorption edge is interpreted by the excitation of Cr++ and Cr+ deep levels.
|Number of pages||5|
|Journal||Materials Research Society Symposium Proceedings|
|State||Published - 1 Jan 2002|
|Event||Progress in Semiconductor Materials for Optoelectronic Applications - Boston, MA, United States|
Duration: 26 Nov 2001 → 29 Nov 2001