Optical Properties of Nearly Lattice-matched AlInN/GaN Single Quantum Wells with Varying Well-widths

摘要

Single GaN quantum wells in the nearly lattice-matched GaN/Al{sub}(1-x)In{sub}xN system have been studied using photoluminescence (PL) and PL excitation (PLE) spectroscopy. The structures were grown on free-standing GaN and sapphire substrates. Selectively excited PL is able to distinguish luminescence originating from the wells, barriers and underlying GaN buffer layers. The PL spectra show the quantum well transition energy decreases as the well-width increases. This manifestation of the quantum confined Stark effect (QCSE) results from intense built-in electric fields. Power dependent PL measurements provide information on the screening of the internal fields. PLE data provide an estimation of the band-gap of nearly lattice-matched Al{sub}(1-x)In{sub}xN layer.