The defect structure of optically degraded quantum wells was investigated by using transmission electron microscopy. The defects comprised dislocation dipoles with a Burgers vector of -(a/2)[101]; inclined at 45º to the (001) plane. The dislocation dipoles consisted of 2 segments which were aligned along the [1¯10] and [120] directions. The [1¯10] dipole segments lying in the (11¯1) plane developed via the recombination-enhanced dislocation glide process, while the [¯1¯20] dipole segments lying in the (¯211) plane developed via a recombination-enhanced dislocation climb process. Both processes operated simultaneously.

S.Tomiya, H.Noguchi, Y.Sanaka, T.Hino, S.Taniguchi, A.Ishibashi: Applied Physics Letters, 1999, 74[13], 1824-6