Internal electric field effect on luminescence properties of ZnO/(Mg,Zn)O quantum wells

Spectroscopic studies have been conducted for wurtzite ZnO/Mg0.27Zn0.73O multiple quantum wells. Internal electric fields at interfaces are found to have an influence on the photoluminescence (PL) properties for well width (Lw) greater than View the MathML source. These experimentally observed features are characteristic of the quantum-confined Stark effects; the magnitude of the electric field due to spontaneous and piezoelectric polarizations and the depth of the triangle-shaped potential wells are the monotonically increasing functions of Mg concentration and the Lw, respectively. Results of the time-resolved PL study are also presented.