Abstract
A set of heterostructures is studied by time-resolved photoluminescence. Four samples with nitrogen concentrations from up to are investigated at different temperatures and with different excitation densities. The experiments suggest that the heterostructure band offset is type I for and type II for . The situation is more complex for and , since these samples are close to the transition from type I to type II. The experimental findings are analyzed using a detailed microscopic theory. Numerical calculations describe the measured data well. In particular, the interpretation of the experimental results concerning the band alignment is confirmed by the theoretical analysis.
2 More- Received 8 October 2004
DOI:https://doi.org/10.1103/PhysRevB.71.165320
©2005 American Physical Society