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We present the optical properties of sulphide cadmium (CdS) deposited, by vacuum evaporation technique, on porous p-type GaAs substrates with different porosities and compared to that deposited on glass and nominal p-type GaAs substrates. The CdS layer deposited on glass substrate exhibit average transmittance about 62% in the visible region and very sharp absorption edge at 495 nm. The room temperature...
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