Abstract
Excited shallow donor and acceptor states are observed in excitation spectra of donoracceptor pair luminescence in ZnTe. The experiments yield a donor ionization energyED =18.3±0.3 meV, and from the Li acceptor 2P3/2, 2P5/2(Γ8), and 2P5/2(Γ7) states valence band parametersµ=0.60±0.10 andδ=0.22±0.05. The latter exceeds values derived from other experiments and indicates considerable nonspherical perturbations associated with this acceptor requiring an extension of existing theories for shallow acceptor states.
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