Abstract
Photorefractive and photochromic effects are investigated in undoped semi-insulating GaP at high temperature. The photochromic effect takes place at the temperature above 340 K and the depreciation of the photorefractive coupling coefficient is observed above 385 K. These results suggest the existence of additional donor and acceptor levels. The binding energy of the donor level is estimated to be 420 meV.
Published Version
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