Parallel twin boundaries arranged at similar intervals of nm-length, that emitted an intense monochromatic light polarized parallel to the boundaries, were self-organized in an indirect-gap AlGaAs epilayer. The epilayer was grown onto a rough As-deficient surface of an AlGaAs(001) substrate with any lattice constant, by using conventional metalorganic chemical-vapor deposition. Most boundaries were of Σ3-type on {111}B, and they extended from the interface between the epilayer and the substrate. No compositional fluctuations existed around the boundaries.

Formation of Multiple Nanoscale Twin Boundaries that Emit Intense Light in Indirect-Gap AlGaAs Epilayers. Y.Ohno, K.Shoda, T.Taishi, I.Yonenaga, S.Takeda: Applied Surface Science, 2008, 254[23], 7633-7