ON THE DIELECTRIC-CONSTANTS OF A(I)B(III)C(2)(VI) CHALCOPYRITE SEMICONDUCTOR COMPOUNDS

Values of the static, epsilon(0), and high-frequency, epsilon(infinity), dielectric constants of I-III-VI2 chalcopyrite compounds are estimated by using an empirical model proposed by Nag for cubic semiconductors, which relates these constants to the average atomic number of its constituent atoms Z(av). It is found, as in the cubic semiconductors, that the inverse of both these constants is linearly related to Z(av). It is also suggested that epsilon(0) and epsilon(infinity) thus obtained should be more reliable than those calculated from the energy gap E(g), due to the wide range of values of this parameter reported in some I-III-VI2 chalcopyrite compounds.