Current Noise due to Ohmic Contacts on Cadmium Sulfide

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Abstract
Current noise measurements on the same lightly doped cadmium sulfide crystal having indium soldered contacts of different quality are used to demonstrate the strong influence of contacts on the observed noise spectra. The results suggest the presence of shallow trapping states distributed in energy and located near the electrodes. The concentration of these states depends on the quality of the contact. These effects are not contact noise in the usual sense since the shape of the noise spectra is only moderately affected; however, the noise level may change by orders of magnitude.