Computer Science
Scientific paper
Oct 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999spie.3794....8l&link_type=abstract
Proc. SPIE Vol. 3794, p. 8-14, Materials and Electronics for High-Speed and Infrared Detectors, Stephen M. Goodnick; Walter F. K
Computer Science
Scientific paper
The effects of intermixing on the radiative emission from InGaAs/GaAs quantum dot (QD) structures with excited state luminescence are presented. Thermally induced compositional disordering of the InGaAs/GaAs interface had been used to blue-shift all peaks and tune their intersublevel energy spacings ((Delta) E(subscript [(i+1) - i]). The inhomogeneously broadened photoluminescence (PL) peaks narrowed. The intersublevel spacings (Delta) E(subscript [(i+1) - i] were reduced and could be tuned continuously for values of (Delta) E(subscript [(i+1) - i] greater, similar and lower than the LO phonon energies in InAs and GaAs. Experiments and calculations of interdiffusion in InGaAs/GaAs quantum wells of the same ternary composition determined values for activation energies and diffusivities. These established values for diffusion lengths corresponding to the observed blue shifts and reduction of (Delta) E(subscript [i+1) - i] with annealing temperature. Rate equation simulations of our experimentally obtained PL spectra were used to estimate relaxation lifetime ratios for intersublevel transitions. A slight trend towards increasing thermalization rates at values (Delta) E(subscript [(i+1) - i] approximately LO phonon energies was found. However, PL measurements showed strong emission from excited states for all (Delta) E(subscript LB(i+1) - i] values, which ranged from 53 to 25 meV.
No associations
LandOfFree
Intermixing-induced tunability in infrared-emitting InGaAs/GaAs quantum dots does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Intermixing-induced tunability in infrared-emitting InGaAs/GaAs quantum dots, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Intermixing-induced tunability in infrared-emitting InGaAs/GaAs quantum dots will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1545941