Gallium Arsenide as a Semi-insulator

  title={Gallium Arsenide as a Semi-insulator},
  author={J. W. Allen},
  • J. Allen
  • Published 1 July 1960
  • Physics
  • Nature
SOME semiconductors have comparatively low resistivity, and this is due to their containing electrically active impurities with energy-levels near a band edge. Others have very high resistivity and this is due to their containing a predominance of impurities with levels far from the band edges, that is, far compared with the thermal energy kT. These latter materials are often referred to as insulators, but since they can carry electronic currents we prefer to introduce the term ‘semi-insulator… 

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