Abstract
The effect of the electric field on the emission rate of electrons from the DX centre has been studied in Te-doped, liquid phase epitaxy Ga1-xAlxAs materials of different alloy composition x. The results obtained-a decrease of the ionization energy or an increase in the emission rate-show that this emission is sensitive to the Poole-Frenkel effect. This clearly demonstrates first that the potential which binds the electron on the DX centre is not the short-range one expected if the DX centre is a deep defect, and second that the DX centre is a single donor state.
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