19 November 1993 Near-surface quantum wells in GaAs: recovery of emission efficiency via surface passivation by hydrogen and stability effects
Author Affiliations +
Proceedings Volume 1985, Physical Concepts and Materials for Novel Optoelectronic Device Applications II; (1993) https://doi.org/10.1117/12.162809
Event: Physical Concepts of Materials for Novel Optoelectronic Device Applications II, 1993, Trieste, Italy
Abstract
The role of surface states in reducing the radiative efficiency of a GaAs/AlGaAs quantum well (QW), situated in proximity of the surface, has been investigated. The near-surface QW photoluminescence (PL) was utilized as a probe of the effects of room-temperature hydrogen irradiation and of the subsequent evolution of the system in time. The e1 - hh1 PL at 1.4 K of various near-surface wells, differing in distance from the surface, was found to drop when the AlGaAs barrier was made thinner than 150 angstroms, due to short-circuiting recombination processes at the surface. The data were interpreted in terms of electron and hole tunneling to surface states. A study of the stability of the passivation effect -- samples being investigated again after an eight-month-long exposure to air, or after annealing in vacuum -- is indicative of important changes in the lifetimes of the different radiative and non-radiative processes associated with the well.
© (1993) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Andrea Frova, Andrea Frova, V. Emiliani, V. Emiliani, Mario Capizzi, Mario Capizzi, B. Bonanni, B. Bonanni, Ying-Lan Chang, Ying-Lan Chang, YongHang Zhang, YongHang Zhang, James L. Merz, James L. Merz, } "Near-surface quantum wells in GaAs: recovery of emission efficiency via surface passivation by hydrogen and stability effects", Proc. SPIE 1985, Physical Concepts and Materials for Novel Optoelectronic Device Applications II, (19 November 1993); doi: 10.1117/12.162809; https://doi.org/10.1117/12.162809
PROCEEDINGS
7 PAGES


SHARE
Back to Top