We have observed the reflection recovery dynamics of photoexcited GaxI
n1-xP/InP:Fe (x<0.18), using the pump-probe technique, and found that
the delay time of the reflection recovery dynamics increases with incr
easing gallium composition. To understand the experimental results, we
have also performed a simulation study, which is in good agreement wi
th the measured data, and shows that ambipolar diffusion plays a domin
ant role in determining the photoexcited carrier dynamics. (C) 1996 Am
erican Institute of Physics.