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Pyroelectric photogating effect on graphene-based long-wavelength infrared photodetectors at room temperature

In this study, room-temperature long-wavelength infrared (LWIR) graphene photodetectors using pyroelectric photosensitizers are demonstrated. The devices comprise graphene-based field-effect transistors with lithium niobate as a pyroelectric photosensitizer. To enhance the photodetector performance, we studied the influence of photosensitizer thickness and ferroelectric polarization direction on the pyroelectric photogating effect. Modulation of the gate current indicates that the IR photoresponse is considerably amplified by thick photosensitizers in which dielectric polarization occurs in the direction perpendicular to the graphene channel. The results will contribute to the development of high-performance graphene LWIR image sensors.