We have studied the growth mechanism of (InP)2/(GaP)2 short-period superlattices (SPS) and In0.5Ga0.5P quantum wells grown on tilted substrates using solid-source molecular beam epitaxy (SSMBE). Both the (InP)2/(GaP)2 SPS and In0.5Ga0.5P quantum wells show blue shifts of photolumincscence (PL) wavelengths when the substrate's tilting angle is increased. The blue shift is more prominent in the SPS structure than in the In0.5Ga0.5P quantum wells. By comparing PL, polarized PL spectra and transmission electron micrographs, we confirm that the ordering effect exists in both the (InP)2/(GaP)2 SPS and In0.5Ga0.5P quantum wells when the substrate tilt angle is small, and can be greatly reduced when the substrate tilt angle is increased. We believed that the height and density of steps on substrates with larger tilt angles repress the segregation of group III adatoms.
|Number of pages||5|
|Journal||Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers|
|State||Published - 1 Jan 1999|
- Polarized PL
- Surface segregation