By using quaternary/quaternary multiple quantum wells, with constant P/As ratios and In-rich wells, it was shown that it was possible to produce a blue-shift of the heavy hole exciton line by interdiffusing only group-III atoms. The use of this type of structure, which was particularly suitable for group-III diffusion studies, yielded a value (for the In-Ga interdiffusion coefficient) of about 4.72 x 10-16cm2/s at 850C.

A.Hamoudi, A.Ougazzaden, P.Krauz, E.V.K.Rao, M.Juhel, H.Thibierge: Applied Physics Letters, 1995, 66[6], 718-20