CURRENTS IN NONCENTROSYMMETRIC NONEQUILIBRIUM SEMICONDUCTORS.

THE RESPONSE OF A NONCENTROSYMMETRIC SEMICONDUCTOR TO SCALAR, VECTOR, AND TENSOR FORCES IS CONSIDERED. THE CURRENT IS CALCULATED IN THE FIRST ORDER WITH RESPECT TO THE TIME DERIVATIVES OF THE TEMPERATURE AND OF THE CARRIER DENSITY, AND THESECOND ORDER WITH RESPECT TO THE GRADIENTS OF THESE QUANTITIES. THE EMF IS OBTAINED FOR A HOMOGENEOUS SAMPLE WITH CARRIERS OF ONE TYPE, WHEN THE ENDS OF THE SAMPLE ARE MAINTAINED UNDER EQUAL CONDITIONS, TOGETHER WITH THE CURRENTS WHICH ACCOMPANY THE ESTABLISHMENT OF EQUILIBRIUM, AND THE SURFACE PHOTOCURRENT DUE TO AN INHOMOGENEOUS DEPTH DISTRIBUTION OF CARRIERS IN THE SAMPLE.