Paramagnetic Resonance of Trapped Holes in ZnSe : Ge and ZnSe : Pb

Abstract

Paramagnetic resonance measurements have been made for Ge and Pb in ZnSe at 77°K. Hyperfine structures (HFS) arising from Ge 73 and from Pb 207 , and superhyperfine structures (SHFS) arising from Se 77 are observed. The large Se 77 superhyperfine splittings show that the wave functions for the EPR centers are localized on the surrounding Se 2- ions. This indicates that the resonances are due to holes trapped at the surrounding Se 2- ions. The EPR spectra are photo-sensitive. The photo-response of the signals shows that the trap levels are located deep in the forbidden energy gap.