K. Zdansky et al., Temperature change of the conductivity type in semi-insulating InP double doped with Zn and Fe, SEMIC SCI T, 15(3), 2000, pp. 297-300
Semi-insulating InP single crystals double doped with Zn and Fe and single
doped with Fe were grown by the Czochralski technique. Resistivity and Hall
coefficient were measured at temperatures between 230 K and 420 K. The Hal
l coefficient shows an extremum at about 250 K and a change of sign to posi
tive below about 235 K in InP:(Zn + Fe). The effect is discussed in terms o
f the strength of electron and hole mixed conductance at various temperatur
es on account of a shift of the Fe deep level with temperature.