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Increase in photoluminescence of Zn-doped p-type InP after hydrogenation

Increase in photoluminescence of Zn-doped p-type InP after hydrogenation

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We report on the effect of hydrogenation on the lowtempeTature (5.5 K) photoluminescence properties of Zndoped p-type (p ∼ 3 × 1018cm-3) InP substrates. The photoluminescence spectrum of the as-grown sample shows a ZnIn acceptor-related transition near the band-edge at l.386eV, a Zn-related PL band at l.214eV and a phosphorus vacancy Vp-related PL band at 1.01 eV. After hydrogenation of the samples by exposure to hydrogen plasma, which completely passivates the ZnIn acceptors over a depth of more than 1μ, the deep luminescence bands (1.214 and 1.01eV) disappeared, with a concomitant ∼ 2000-fold increase in the intensity of the near-band-edge emission. Such a large increase in radiative efficiency together with the elimination of the deep luminescence bands indicates hydrogen passivation of deep nonradiative centers in addition to passivation of shallow acceptors.

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