Study of the photoexcited carrier dynamics in InP:Fe using time-resolved reflection and photoluminescence spectra

The photoexcited carrier dynamics and photoluminescence of the undoped InP and Fe implanted InP was studied by timeresolved reflection and photoluminescence spectra. The decay times of reflection recovery and the radiative recombination for Fe implanted InP are shorter than those of undoped InP. Considering the surface recombination, a model was developed to simulate the reflection recovery dynamics, it agrees with the experimental results very well. Moreover, we obtained the ambipolar diffusion coefficient and the surface recombination velocity by using the model. For Fe-doped InP, the surface recombination velocity is much larger than that for the undoped InP, which is probably due to Fe2þ/3þ trapping centers and the large surface band bending. The PL decay time for Fe implanted InP is shorter than that for undoped InP, which is ascribed to the capture centers introduced by metallic precipitates. # 2004 Elsevier B.V. All rights reserved