MoS2 based photosensor for detecting both light wavelength and intensity

An instrument comprising:

• a photosensor having
• a substrate,
• one or more layers of a two-dimensional (2D) transition metal dichalcogenide disposed upon the substrate, and
• a plurality of electrodes including a drain electrode;
• and
• an electrical parameter analyzer coupled to the drain electrode, the electrical parameter analyzer configured to measure a photoresponse in terms of drain current verses time of the photosensor wherein the photoresponse includes a fast response component and a slow response component, and the electrical parameter analyzer is configured to determine both intensity and wavelength of light incident upon the photosensor by using the fast response component alone to determine the intensity of the light and the slow response component to determine the wavelength of the light.

A method of operating a photosensor that includes one or more layers of a two-dimensional (2D) transition metal dichalcogenide, the method comprising:

• measuring a photoresponse provided by the one or more layers of the 2D transition metal dichalcogenide in terms of current verses time;
• detecting a fast response component and a slow response component of the photoresponse;
• based on the fast response component alone, determining intensity of light incident on the photosensor;
• and
• based on the slow response component determining a wavelength of the light incident on the photosensor.