The Effect of Tensile Strain on Optical Anisotropy and Exciton of m -Plane ZnO

Abstract

The near band edge emission of the tensile-strained m -plane ZnO film grown on (112) LaAlO3 substrates shows abnormal low polarization degree ( ρ=0.1 ) . The temperature dependency of polarization degree clarifies the origins of different emission peaks. In tensile-strained m-plane ZnO, the [0001] polarized state is upper shifted and is overlapping with the [ 112¯¯¯0 ] polarized state. This phenomenon causes the abnormal low polarization degree and reveals the effect of strain on the emission anisotropy of m -plane ZnO.