NONDESTRUCTIVE DETERMINATION OF SHEET CARRIER DENSITY IN PSEUDOMORPHIC ALGAAS INGAAS/GAAS HIGH-ELECTRON-MOBILITY TRANSISTOR STRUCTURES BY ROOM-TEMPERATURE PHOTOLUMINESCENCE SPECTRA/

This paper describes a nondestructive method to determine the sheet ca rrier density of pseudomorphic high electron mobility transistor struc tures by fitting the room-temperature photoluminescence (PL) spectra. The sheet carrier densities determined were in sufficiently good agree ment with values determined by Hall measurements for different samples with different mole fractions, delta-doping densities and well widths . For single-doped AlGaAs/InGaAs quantum wells, the dominant emission is the transitions from the first electron subband to the first heavy hole subband, from the first electron subband to the second heavy hole subband, and from the second electron subband to the first heavy hole subband.