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High Responsivity, Large-Area Graphene/MoS$_2$ Flexible Photodetectors.

Accepted version
Peer-reviewed

Type

Article

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Authors

Goykhman, I 
Yoon, D 
Bruna, M 
Eiden, A 

Abstract

We present flexible photodetectors (PDs) for visible wavelengths fabricated by stacking centimeter-scale chemical vapor deposited (CVD) single layer graphene (SLG) and single layer CVD MoS2, both wet transferred onto a flexible polyethylene terephthalate substrate. The operation mechanism relies on injection of photoexcited electrons from MoS2 to the SLG channel. The external responsivity is 45.5A/W and the internal 570A/W at 642 nm. This is at least 2 orders of magnitude higher than bulk-semiconductor flexible membranes. The photoconductive gain is up to 4 × 105. The photocurrent is in the 0.1-100 μA range. The devices are semitransparent, with 8% absorptance at 642 nm, and are stable upon bending to a curvature of 1.4 cm. These capabilities and the low-voltage operation (<1 V) make them attractive for wearable applications.

Description

Keywords

MoS$_2$, flexible optoelectronics, graphene, heterostructures, photodetectors

Journal Title

ACS Nano

Conference Name

Journal ISSN

1936-0851
1936-086X

Volume Title

10

Publisher

American Chemical Society
Sponsorship
Engineering and Physical Sciences Research Council (EP/K01711X/1)
Engineering and Physical Sciences Research Council (EP/K017144/1)
Engineering and Physical Sciences Research Council (EP/L016087/1)
European Research Council (319277)
European Commission (604391)
European Commission Horizon 2020 (H2020) Future and Emerging Technologies (FET) (696656)
EPSRC (1354817)
Engineering and Physical Sciences Research Council (EP/M507799/1)
European Union Graphene Flagship, European Research Council (Grant ID: Hetero2D), Engineering and Physical Sciences Research Council (Grant IDs: EP/509 K01711X/1, EP/K017144/1, EP/N010345/1, EP/M507799/5101, EP/L016087/1), Swiss SNF Sinergia (Grant ID: 147607), Marie Curie ITN network MoWSeS (Grant ID: 317451)