Enhancement the sensitivity of CdS nano structure by adding of rare earth materials

Abstract

Thin films of Cerium (Ce+3) doped Cadmium Sulfide (CdS) were successfully deposited on glass and silicon substrates by Chemical Spray Pyrolysis Method at different ratios with temperature 200 oC. The results shown a high quality nanoparticles and a strong orientation to the (002) plane of the wurtzite (hexagonal) phase. The fast rise and decay times of the photocurrent were confirmed that the best quality of the fabricate photodetector device. Light responsivity was at (460, 550 and 680 nm), and the device showed a good specific detectivity and quantum efficiency when illuminated by (460, 550 and 680 nm).CdS:Ce at 10% clarifies higher responsivity (0.144 A/W), quantum efficiency (38.58%), and specific detectiviy (2.7#x00D7;1011 Jones) at 460 nm illumination (3.108 mW/cm2), also the device for CdS:Ce at 10% reveals the fast with 800 ms rise time and 860 ms decay time and the sensitivity reach to 5523.