Paramagnetic Resonance and Hall Coefficients in Fe-Doped n-Type GaP

Abstract
Fe impurities in solution‐grown n‐type GaP crystals have been studied with the measurements of the paramagnetic resonance and the Hall coefficient at and above 77°K. It is shown that Fe impurities act as electron traps and when they have trapped electrons, reveal the paramagnetic resonance spectrum which the authors already reported as due to the (3d)7 configuration. It is confirmed that the resonance spectra appear only in n‐type GaP crystals by doping with various amounts of Fe and Te, Sn, or Zn. The trap level is found to be near the conduction band.