BAND DISCONTINUITIES IN GAS ALGAAS SL AND MQW SYSTEMS/

Investigations using the traditional optical absorption measurements a nd orthodox lock-in techniques in the PL measurements in conjunction w ith effective mass band structure calculation including non-parabolici ty in both the well and the barrier have been carried out. The investi gations revealed that factors such as the band model, type of theoreti cal model, use of wide well-samples, uncertainties in parameters like effective mass, energy gap and hence the nonparabolicity constants, in addition to the uncertainties in the well-width, have immensely contr ibuted to the controversy witnessed on the band discontinuities in the early and mid-eighties on the GaAs/AlGaAs MQW and SL systems.