Noise characteristics produced between electrodes and chemically deposited PbS Photoconductor surfaces were examined. After deposited, PbS films were oxidized under several annealing temperatures. Electrodes were formed with pasted materials such as gold or silver paste, C.C (colloidal carbon) and MAg (metallo organic Ag). 0bserved noises were mainly 1/f noises, and higher the oxidizing temperatures for PbS films. the value of noise becomes larger. More-over the magnitudes of noises were affected with the kind of electrode materials in the order relation of Au<Ag<C.C<MAg. To know the influence of surface contactness irregularity on noise characteristics. several measurements were executed.-(a)with using different particle size C.C electrode, -(b) changing roughness of the PbS surface by controlling the condition of PbS deposition. But little affection was observed on 1/f noise. From the measurement of V-I characteristics of PbS films there become evident that the 1/f noise become large with the order of non-ohmic contactness become large, that is the space charge limiting effect may be become predominant
