Near Infrared detection of graphene/metal intercalated graphene photodetector

Here a graphene-based photodetectors with ability to integrate with various energy thermoelectric, electromagnetic and piezoelectric devices is reported. The fabrication of the proposed device is based on magnetic field assisted pulsed laser deposition (MFPLD) for growth of few layers graphene on Ni substrate and intercalated chemical vapor deposition (CVD) graphene grown on Cu substrate and wet transfer of the layers to the electrode surface. The physical properties of the bulk material (target) such as density and smoothness of surface, as well as the plasma plume particles charge type and velocity have been optimized for the best operation of the device. For the electrical contacts a tapered aluminum microelectrode (TAM) has been used to improve the detection of photogenerated carriers during the illumination. The results highlight the acceptable wide band response, leading to a responsivity of up to 0.13AW^-1, quantum efficiency of 9.5% (at wavelength of 1700nm) and room temperature specific detectivity of 1.27x10⁺⁷ Jones at the frequency of 176THz. The mechanism of photogeneration and photogenerated carriers transport also explained.