Alloy composition dependence of photoexcited carrier dynamics in GaxIn1-xP/InP:Fe(x<0.18)

We have observed the reflection recovery dynamics of photoexcited GaxIn1-xP/InP:Fe (x<0.18), using the pump-probe technique, and found that the delay time of the reflection recovery dynamics increases with increasing gallium composition. To understand the experimental results, we have also performed a simulation study, which is in good agreement with the measured data, and shows that ambipolar diffusion plays a dominant role in determining the photoexcited carrier dynamics. (C) 1996 American Institute of Physics.