Nitrogen inhomogeneity in LPE GaP is studied by spatially resolved photoluminescence. It is found that the nitrogen is doped much less under the macrostep riser which is composed of high-density atomic steps. The origin of this nonuniformity is discussed and it is concluded that the equilibrium concentration of nitrogen along a step is frozen in the bulk crystal, and hence the bulk concentration shows the step velocity dependence.
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Nishinaga et al. (1989) studied this question.
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