1/f noise is measured on long wavelength diodes as a function of devic
e geometry, band gap, temperature, diode bias, and anneal temperature
for a Te-rich CdTe passivation layer. The results show that for these
diodes the 1/f noise is a bulk phenomena due to the modulation of gene
ration recombination current associated with defects formed by the int
erdiffusion of Te-rich CdTe, and that these defects are located in the
junction region. No 1/f noise is observed for the lowest interdiffusi
on anneal temperature.