Observation of confined states in an In0.53Ga0.47As/In0.52Al0.48As multi-quantum wells structure by quantum confined Stark effects

Photocurrent spectra in an In0.53Ga0.47As/In0.52Al0.48As multi-quantum well s structure containing 9.4 nm wide wells were measured at room temperature in electric fields. The exciton peaks of ground-state transitions shifted f airly in 167 kV cm(-1) as the quantum confined Stark effect. Stark shifts w ere calculated by using the Runge-Kutta method using the effective mass equ ation with our experimental band parameters. Our parameters are the hole ef fective masses and valence band offset derived from saturation of a highest eigen energy, electron effective mass depending on energies and the conduc tion band offset derived from observed quantum number. It was possible to s ufficiently use our experimental band parameters for the calculation of the Stark shift in the electric field. (C) 2001 Academic Press.