Electron Spin Resonance of Photosensitive Fe^<3+> Centers in CdSe

概要

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ESR measurement has been carried out at X-band on isolated Fe^<3+> (3d^5, ^6<S>) in CdSe. The spin Hamiltonian parameters for Fe^<3+> are estimated at 1.5°K as follows: g = 2.043±0.002, α = (103±5) × 10^<-4>cm^<-1>, D = (602±3) × 10^<-4>cm^<-1>, and F = (-11±5) × 10^<-4>cm^<-1>. The influence of charge transfer from Fe^<3+> to the surrounding ligands upon these parameters is discussed. Change of the valency of iron impurities caused by illumination is studied through the change of the intensity of Fe^<3+> ESR signal. Following processes are elucidated. Light of 0.8 to 1.1μ excites holes from Fe^<3+> to the surrounding Se^<2-> ions; the excited holes are iiberated thermally into the valence band. Light of about 7.4μ excites electrons from Fe^<2+> to the conduction band. Light of around 1.8μ liberates holes from cadmium vacancies; a part of the liberated holes migrates through the valence band to Fe^<2+>. Fe^<3+> captures electrons from the conduction band, viz, acts as a recombination center for electrons.
1967-04-05