THEORY OF PHOTOVOLTAIC EFFECTS IN N-TYPE GAP

The photon mechanism of the linear ballistic and displacement photovol taic effects has been studied theoretically. This mechanism is based r espectively on an asymmetry of the probability of optical transitions between the X1 and X3 conduction subbands of n-type GaP in which long- wavelength phonons participate and on a displacement of carriers in re al space in the course of quantum transitions. The drag of electrons b y photons in n-type GaP due to indirect intersubband optical transitio ns, with allowance for the photon momentum, has been studied. The theo retical results are compared with experimental data.