The temperature dependence of 1/f noise in InP

Noise spectra were measured on CBE grown InP samples in the frequency range from 1 Hz to 104 kHz at temperatures from 77 to 500 K. The experimental results show that llfnoise stems from the lattice scattering. The 1/f noise in InP is well characterised by a parameter CtL~,, in this temperature range. The temperature dependence of ~tLat, was determined experimentally. Assuming that the number of phonons in a mode fluctuates with a 1/f spectrum, we are able to derive a theoretical expression for ~Latt in terms of the contributions by the acoustic phonons and the polar optical phonons. At low temperatures ( <200 K), the temperature dependence of OtL~,, can be analysed by this model with two kinds of phonons. However, at temperatures above 200 K, the model does not lead to satisfactory results