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Infrared studies of the dynamics of transformations between normal and metastable state of the EL2 center in GaAs

: Fuchs, F.; Dischler, B.


Applied Physics Letters 51 (1987), Nr.3, S.679-681 : Abb.,Lit.
ISSN: 0003-6951 (Print)
ISSN: 1077-3118
Fraunhofer IAF ()
Galliumarsenid; Infrarot; Metastabilität; transformation

The bleaching of the EL2 absorption and its thermal regeneration are typical time-dependent processes. Compared to the conventional time transient analysis, faster and more accurate data acquisition is described. This technique is based on the combined use of optical absorption and its time derivative, measured while either the energy of the bleaching light or the sample temperature is varied. The peak of the spectral response for bleaching shifts to lower energies in the temperature range 10 to 130 K. The activation energy for thermal regeneration can decrease by a factor of 6 between semi-insulating and n-type samples. We report the first optical identification of persistent electrons, which are photogenerated during EL2 bleaching at 10 K. The thermal disappearance of persistent electrons and holes has also been studied. (IAF)