Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Enhanced photoresponse in MoTe2 photodetectors with asymmetric graphene
  contacts   Atomically thin two dimensional (2D) materials are promising candidates for
miniaturized high-performance optoelectronic devices. Here, we report on
multilayer MoTe2 photodetectors contacted with asymmetric electrodes based on
n- and p-type graphene layers. The asymmetry in the graphene contacts creates a
large (Ebi ~100 kV cm-1) built-in electric field across the short (l = 15 nm)
MoTe2 channel, causing a high and broad (400 to 1400 nm) photoresponse even
without any externally applied voltage. Spatially resolved photovoltage maps
reveal an enhanced photoresponse and larger built-in electric field in regions
of the MoTe2 layer between the two graphene contacts. Furthermore, a fast
(~0.01 ms) photoresponse is achieved in both the photovoltaic and
photoconductive operation modes of the junction. Our findings could be extended
to other 2D materials and offer prospects for the implementation of asymmetric
graphene contacts in future low-power optoelectronic applications.

21
The categories of this paper are: adap-org
33
The categories of this paper are: plasm-ph
16
The categories of this paper are: stat
11
The categories of this paper are: hep-lat
31
The categories of this paper are: ao-sci
4
The categories of this paper are: cond-mat
0
The categories of this paper are: hep-ph
29
The categories of this paper are: funct-an
23
The categories of this paper are: solv-int
5
The categories of this paper are: gr-qc
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The categories of this paper are: econ
27
The categories of this paper are: comp-gas
2
The categories of this paper are: math
24
The categories of this paper are: dg-ga
13
The categories of this paper are: quant-ph
19
The categories of this paper are: eess