Abstract
Semi-insulating InP samples doped with transition metals were grown by the Czochralski technique. Both Hall and Seebeck effect measurements show the change of Hall and Seebeck coefficient sign at low temperatures. Electron hopping between iron or titanium ions in the nearest sites is assumed to cause the change. The theoretical calculations based on the mixed conductivity model are in good agreement with experimental values. Different temperatures for the change of sign of Seebeck or Hall coefficients for different samples are related to the activation energy of deep Ti donor and Fe acceptor energy levels, and also to the acceptor-to-donor compensation ratio.
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