Abstract
In this work, self-powered photodetectors were fabricated by a simple, cost-effective method using cadmium sulfide (CdS) as photoactive layer and carbon as a hole transport layer. A study on the performance of photodetectors with varied thickness of CdS layers deposited on an FTO coated glass substrate via the Successive Ionic Layer Adsorption and Reaction (SILAR) method is studied in detail. X-Ray diffraction (XRD) data confirms the formation of the CdS layer. Field emission scanning electron microscopy (FESEM) and elemental mapping shows the spherical clustered formation with a uniform distribution of CdS nanoparticles. The band gap of the CdS layers in the range of 2.25 to 2.38 eV is closer to the desired band gap of visible light photodetector. Though solution-processed photodetectors show a very weak photoresponse, the fabricated device shows a responsivity of 0.11✗10−3 A/W and a rapid rise and fall time as fast as 0.16 s and 0.12 s.
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