Abstract
We have studied by deep-level transient spectroscopy and deep-level optical spectroscopy n-type chromium-doped InP. We definitively confirm that the Cr2+/Cr3+ acceptor state is positioned at EC −0.4 eV in InP. We have measured for the first time the absolute values of the photoionization cross sections of Cr2+ in InP by deep-level optical spectroscopy. The σ0n cross section exhibits both a resonant and a nonresonant character. The former corresponds to the internal transition 5T2→5E of Cr2+, while the latter is attributed to the photoexcitation from the Cr2+ to the conduction band. The threshold of this transition at EC −0.41 eV indicates a very small Franck–Condon shift. The scales of the absolute photoionization values (σ0n) and photoneutralization (σ0p) cross sections towards the conduction and valence bands are the same, which seems to indicate no selection rules.
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