Spatial variation of bandgap energy in In(0.53)Ga(0.47)As.
01 January 1984
We report the observation of spatial variation of the bandgap energy of In(0.53)Ga(0.47)As in high quality epitaxial samples grown lattice matched to InP. Nine samples grown by three different techniques (LPE, VPE and MBE) were investigated and they all showed this apparently random spatial variation. A bandgap variation as large as 15 meV was observed over distances of the order of 1 mm, effect corresponding to two percent of bandgap energy.