This contribution reports the redistribution behavior of Fe during the growth of InP layers from liquid phase with addition of some rare earth elements on semi-insulating InP:Fe substrates. A study was made of the influence of different rare earths on the Fe diffusion into InP layer and compared it with the phenomenon of an extraction of Fe from Fe doped materials into adjacent layers doped by Zn, Cd and Be, reported recently. In the case of Tm addition a conversion of electrical conductivity of InP layer to semi-insulating as a consequence of Fe diffusion was observed while no significant Fe inter-diffusion was confirmed in the presence of other investigated rare earth additions.

Effect of Fe Interdiffusion on Properties of InP Layers Grown with Addition of RE Elements. O.Procházková, J.Zavadil, K.Zdánský: Physica Status Solidi C, 2005, 2[4], 1269-74

Figure 2

Diffusivity of Zn in InP

(Upper plot: under P over-pressure, D (cm2/s) = 9.2 x 10-2 exp[-1.61(eV)/kT]

Lower plot: under vacuum, D (cm2/s) = 1.0 x 10-3 exp[-1.36(eV)/kT])