ABSTRACT
This chapter examines the fundamental properties such as structural and optical properties of alloys and fabricated heterostructures including nanostructures. The exciton in oxide semiconductor seems to be easily localized by the alloy fluctuation, because a ZnO- based semiconductor has strong electronegativities and the small Bohr radius of exciton. This chapter describes The growth and characteristics of wurtzite Zn(Mg,Cd)O alloys and its heterostructures using remote-plasma-enhanced metal-organic chemical vapor deposition system. There has been a big issue on structural phase transition from wurtzite to rock salt with increasing alloy content in contrast to the Ga(In,Al)N ternary system. The increment tendency of the localized depth is also in good agreement with the photoluminescence (PL) full width at half maximum (FWHM). The localization of exciton in Zn(Mg,Cd)O alloys strongly affects PL FWHM due to the small Bohr radius of exciton. ZnCdO-based heterostructures have been fabricated and characterized on PL properties.
