1. Drift mobility and photoluminescence measurements on high resistivity Cd1−xZnxTe crystals grown from Te-Rich solution
- Author
-
Satoru Seto, Kazuaki Imai, S. Dairaku, N. Takojima, T. Sawada, and Kazuhiko Suzuki
- Subjects
Electron mobility ,Photoluminescence ,Materials science ,Solid-state physics ,Annealing (metallurgy) ,Doping ,Analytical chemistry ,Trapping ,Electron ,Condensed Matter Physics ,Electronic, Optical and Magnetic Materials ,Vacancy defect ,Materials Chemistry ,Electrical and Electronic Engineering - Abstract
The drift mobilities of chlorine doped high resistivity Cd0.8Zn0.2 Te have been investigated by using the time-of-flight technique. Electron as well as hole mobility in the as-grown crystals is limited by trap-controlled carrier transport. The energy locations of the defects responsible for carrier trapping are determined to be Ec- 0.03 and Ev+ 0.14 eV for electrons and holes, respectively. After annealing at 400°C for 80 h, no evidence of trap-controlled mobility was recognized for electrons. On the other hand, no significant change before and after the annealing was observed for hole transport. Those results and the change in the photoluminescence spectra before and after the annealing are explained by the complex defect model composed of the Cd vacancy and chlorine donor. Further, the alloy scattering potentials of ΔUe and ΔUh were estimated by employing the theoretical calculation method recently reported by D. Chattopadhyay [Solid State Commun. 91, 149 (1994)].
- Published
- 1996