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UV light is useful for photo detectors

Ultraviolet light increases bandwidth of a photo detecting device and gives a much wider spectral response

Policy Pulse
Publish Date: Oct 22 2016 4:12PM | Updated Date: Oct 22 2016 4:12PM

UV light is useful for photo detectors
Scientists have found a new way to widen the frequency range that smartphone cameras detect with the use of ultraviolet light. 
 
Ultraviolet light increases bandwidth of a photo detecting device that earlier posed a menace for the company that manufacture them. 
 
A team of scientists found that the redistribution of electrons within a polymer under the influence of light, results in electrical conductivity.
 
The experiment was conducted by exposing a polymer-based photo detector incorporating zinc oxide (ZnO) nano-particles to UV light for 30 seconds.
 
The experiment resulted in a photo detector with a much wider spectral response and a maximum external quantum efficiency (EQE) of 140,000%, as compared to the 30% measured before UV treatment.
 
Not only that, the UV radiation can alter device’s sensitivity.