WS2 Nanosheet/Graphene Heterostructures for Paper-Based Flexible Photodetectors
2020
We
report a low-cost and green synthesis approach to produce high-performance
optoelectronics based on WS2-decorated pencil trace on
ordinary cellulose paper. It is noteworthy that the photodetector
was prepared via simply nontoxic solution-processed
WS2 nanosheets, pencil-drawn graphene conducting films,
and biodegradable papers. Portable and flexible electronics based
on WS2/graphene show excellent photoresponse in a broad
spectral region from visible to near IR because of plasmonic improvement
and efficient photoabsorption. Liquid-phase-exfoliated atomically
thin WS2 nanosheets were decorated on a conducting film
of pencil trace using the large area electrophoretic deposition technique.
The photodetector based on the WS2/graphene heterostructure
shows excellent temporal photoresponse with a responsivity of 0.439
A/W, a detectivity of 1.41 × 1010 Jones, and an external
quantum efficiency of 81.39%. The high-performance photodetector shows
piezoresistive modulation in electric transport. The device response
was investigated up to 500 bending cycles. Finally, the present finding
advocates the great development over previously reported nonbiodegradable
and small-area optoelectronic devices.
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