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Cadmium sulfide photodetector was fabricated. The CdS nanopowder has been prepared by a chemical method and deposited as athin film on both silicon and porous p- type silicon substrates by spincoating technique. Structural, morphological, optical and electricalproperties of the prepared CdS nano powder are studied. The X-rayanalysis shows that the obtained powder is CdS with predominantlyhexagonal phase. The Hall measurements show that the nano powderis n-type with carrier concentration of about (-5.4×1010) cm-3. Theresponse time of fabricated detector was measured by illuminatingthe sample with visible radiation and its value was 5.25 msec. Thespecific detectivity of the fabricated detector is found to be (9×1011W-1 .Hz1/2.Cm- 1). The responsivity was (0.03A/W).

Porous Silicon effect on the performance of CdS nanoparticles photodetector