Picosecond recombination of charged carriers in GaAs

McLean, D. G.; Roe, M. G.; D’Souza, A. I.; Wigen, P. E.
April 1986
Applied Physics Letters;4/14/1986, Vol. 48 Issue 15, p992
Academic Journal
The recombination kinetics of charged carriers in GaAs have been investigated on a picosecond time scale. A pump-probe technique was used to measure reflectivity changes as a function of time up to 900 ps. Initially, (1.2±0.2)×1020 carriers/cm3 were excited into the conduction band. The decay curve indicated dominance of a three-body (Auger) recombination process up to about 120 ps, with two-body recombination processes dominating after 120 ps, the switch occurring at a carrier concentration of (5±2)×1019 carriers/cm3. Values for the Auger recombination coefficient and the two-body recombination coefficient were determined to be (7±4)×10-31 cm6 s-1 and (3.4±1.7)×10-11 cm3 s-1, respectively. The change in reflectance was observed to have essentially returned to zero within 900 ps.


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