Abstract
It has been established that the CuInSe2 chalcopyrite is a semiconductor of the impurity type with a more complicated dependence of conductivity on temperature than ordinary impure semiconductors. Such a temperature depen- dence of electrical conductivity is due to the complex structure of the energy spectrum of electrons in these crystals. The values of energies of the activation of their intrinsic energy defects, formed by the violation of CuInSe2 stoichiome- try, have been calculated from the temperature dependence of electrical conductivity. The analysis of temperature depen-dence of the thermal e.m.f. has revealed that the main scattering mechanism is the scattering on acoustic phonons.