Abstract
The development of an ultrafast optical switch is demonstrated in this work using a surface passivated nanocrystalline cadmium sulfide (CdS) thin film. The optical switching ratio of the Ag/CdS/Ag device, after surface passivation with nitrocellulose, is 2.1 × 104 in just 0.4 ms under a constant bias of 10 V and blue light (380 nm) of intensity ∼7.4 mW/cm2, which is 100 times higher than the native device. This is because the surface sulphur vacancy defects are suppressed, increasing the concentration of photo-generated free carriers.
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