Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Graphene-based light sensing: fabrication, characterisation, physical
  properties and performance   Graphene and graphene-based materials exhibit exceptional optical and
electrical properties with great promise for novel applications in light
detection. However, several challenges prevent the full exploitation of these
properties in commercial devices. Such challenges include the limited linear
dynamic range (LDR) of graphene-based photodetectors, the lack of efficient
generation and extraction of photoexcited charges, the smearing of photoactive
junctions due to hot-carriers effects, large-scale fabrication and ultimately
the environmental stability of the constituent materials. In order to overcome
the aforementioned limits, different approaches to tune the properties of
graphene have been explored. A new class of graphene-based devices has emerged
where chemical functionalisation, hybridisation with light-sensitising
materials and the formation of heterostructures with other 2D materials have
led to improved performance, stability or versatility. For example,
intercalation of graphene with FeCl$_3$ is highly stable in ambient conditions
and can be used to define photo-active junctions characterized by an
unprecedented LDR while graphene oxide (GO) is a very scalable and versatile
material which supports the photodetection from UV to THz frequencies.
Nanoparticles and quantum dots have been used to enhance the absorption of
pristine graphene and to enable high gain thanks to the photogating effect. In
the same way, hybrid detectors made from stacked sequences of graphene and
layered transition-metal dichalcogenides enabled a class of detectors with high
gain and responsivity. In this work we will review the performance and advances
in functionalised graphene and hybrid photodetectors, with particular focus on
the physical mechanisms governing the photoresponse in these materials, their
performance and possible future paths of investigation.

12
The categories of this paper are: nucl-th
27
The categories of this paper are: comp-gas
2
The categories of this paper are: math
26
The categories of this paper are: bayes-an
25
The categories of this paper are: patt-sol
0
The categories of this paper are: hep-ph
37
The categories of this paper are: supr-con
19
The categories of this paper are: eess
22
The categories of this paper are: chao-dyn
10
The categories of this paper are: q-bio
16
The categories of this paper are: stat
20
The categories of this paper are: acc-phys
17
The categories of this paper are: q-fin
24
The categories of this paper are: dg-ga
36
The categories of this paper are: cmp-lg
14
The categories of this paper are: math-ph