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In order to have high performance thermopower sensors their thicknesses should be as less as possible. For example the less thickness, the higher speed response. Electrodeposition is one of the convenient methods to grow such ultra thin sensors.
In this work electrodeposition of constantan/Cu bilayers on Si & GaAs under potentiostatic control at room temperature and from a citrate based electrolyte containing both Ni and Cu ions are presented. An Ohmic contact was made using a GaIn eutectic followed by Ag conducting sheet. The structure of the films was studied using XRD technique and their surface roughness was investigated by a scanning electron microscope. The films were also analyzed using EDX. The effect of electrodeposition parameters such deposition potential, pH of solution, current efficiency, ions concentration, were also studied. A number of constantan/Cu bilayer films with different thicknesses were fabricated under optimum conditions. The electrolyte temperature during the growth has been changed and then the roughness of the films were studied using SEM.
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