ON THE WAY TO THE INVESTIGATION OF HYDROGEN IN GAN - HYDROGEN IN NITROGEN-DOPED GAP AND GAAS

Because of the great electronegativity of nitrogen, hydrogen is expect ed to behave differently in GaN and in the more conventional III-V sem iconductors GaP and GaAs. In order to check this point, we have perfor med a spectroscopic investigation of nitrogen and hydrogen doped GaP a nd GaAs. In GaP, three different states of a nitrogen-hydrogen complex have been observed; two of these states, which correspond to two diff erent charge states of the complex, are observed at equilibrium wherea s the third one is metastable. The complex involves two hydrogen atoms ; its structure is discussed. In GaAs, only two states of the complex are observed: a stable one and a metastable one.