Abstract
A series of experiments is described in which radio-tracer zinc was diffused into GaP at 900 degrees C in a closed ampoule. Various weights of zinc and phosphorus were used in the ampoule for the different experiments. Diffusion profiles were plotted. The profiles are not simple, i.e. they cannot be described by a single value of diffusion constant. It is shown that the effect of increasing the phosphorus over-pressure is to decrease the overall penetration of the profile. This result, taken together with the shape of the profiles, is consistent with the proposal of previous workers that zinc diffuses in GaP by a substitutional-interstitial mechanism. The previously determined Ga/P/Zn phase diagram for 900 degrees C is discussed, and it is shown that if it is used in conjunction with the available vapour-pressure data, each of the diffusions can be placed on the phase diagram. The vapour pressures of zinc and phosphorus in the ampoule can then be calculated for each of the diffusions. It is shown that the results suggest that most of the zinc occupies the gallium site as an ionized acceptor. The results also allow an estimate to be made for the form of the GaP/Zn solidus line at 900 degrees C.
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