Spectral and temporal characteristics of AlGaAs/GaAs superlattice p-i-n photodetectors

Larsson, A.; Yariv, A.; Tell, R.; Maserjian, J.; Eng, S. T.
October 1985
Applied Physics Letters;10/15/1985, Vol. 47 Issue 8, p866
Academic Journal
We report on measurements of the spectral and the temporal response of AlGaAs/GaAs p-i-n photodetectors with superlattice intrinsic regions grown by molecular beam epitaxy. The feasibility for high-speed applications is demonstrated by a time constant limited impulse response of 200 ps (full width at half-maximum) when excited near the band edge with 100 ps optical pulses. We observed the theory-predicted and recently verified voltage tunability of the band edge with clearly resolved excitonic resonances. The responsivity was measured to be 0.2 A/W.


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