SOLID SOLUTIONS IN PSEUDOBINARY (3-5)-(2-6) SYSTEMS AND THEIR OPTICAL ENERGY GAPS

Solid solubilities and optical bandgaps on a large number of pseudobinary (III-V)-(II-VI) systems have been studied. Four systems, GaAsSingle Bond signZnO, GaAsSingle Bond signCdS, InPSingle Bond signZnO, and InPSingle Bond signCdS, were found to be completely immiscible. Five systems, GaAsSingle Bond signZnS, GaAsSingle Bond signZnTe, InPSingle Bond signZnS, InPSingle Bond signZnSe, and AlSbSingle Bond signZnTe, exhibited partial miscibility. Only three alloy systems, GaAsSingle Bond signZnSe, GaPSingle Bond signZnSe, and GaPSingle Bond signZnS, were found to form solid solutions throughout the entire system. The dependence of lattice parameter on composition for the GaAsSingle Bond signZnSe system is sublinear, while for the GaPSingle Bond signZnSe and GaPSingle Bond signZnS systems, it is approximately linear. The dependence on composition of optical bandgap for the first system is sublinear, and the dependence both in the second and third systems is anomalously sublinear, with the greatest changes occurring near the II-VI end component. Preliminary analyses of optical absorption data in all the three miscible systems indicated the existence of direct bandgap material. Preliminary doping results indicated that some GaAsSingle Bond signZnSe and GaPSingle Bond signZnSe compositions can be doped both n- and p-type. © 1969 The American Institute of Physics.