Author(s): Cottam N.; Turyanska L.  

    |     ISSN: 3005-2092  

This paper reports a comprehensive study of surface functionalised graphene for photon detection in the UV-VIS-NIR range. We have studied CVD single layer graphene and inkjet-printed graphene functionalised by PbS quantum dots, CsPbX3 nanocrystals, and van der Waals semiconductor materials.

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ABSTRACT

Exploitation of the unique electronic properties of graphene and its compatibility with surface functionalisation offers a platform for an expansive range of applications in electronics and optoelectronics. By capping the graphene layer with another material or nanostructure, such as PbS quantum dots, the photoresponsivity can be enhanced to > 109AW-1in the Visible (VIS) to near infrared range. Recent progress in the synthesis of highlystableinorganic perovskite nanocrystals (NCs) has led to their increasing use in broadband photodetectors. These NCs are of particular interest for the UV range as they have the potential to extend the wavelength range of photodetectors based on traditional materials. We demonstrated a defect-assisted photoresponsivity (R > 106AW-1in the UV-VIS range) in graphene transistors decorated with all-inorganic caesium lead halide perovskite NCs. Advances in additive manufacturing and inkjet printing enabled us to formulate printable graphene and perovskite NC inks and fabricate partially and fully printed UV-VIS photosensors with photoresponsivity, reaching > 106AW-1for partially printed graphene/perovskite detectors and 20 AW-1 for fully printed

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