High Responsivity, Large-Area Graphene/MoS2 Flexible Photodetectors

Domenico De Fazio, Ilya Goykhman, Duhee Yoon, Matteo Bruna, Anna Eiden, Silvia Milana, Ugo Sassi, Matteo Barbone, Dumitru Dumcenco, Kolyo Marinov, Andras Kis, Andrea C. Ferrari*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

287 Scopus citations

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.

Original languageEnglish
Pages (from-to)8252-8262
Number of pages11
JournalACS Nano
Volume10
Issue number9
DOIs
StatePublished - 27 Sep 2016
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2016 American Chemical Society.

Keywords

  • flexible optoelectronics
  • graphene
  • heterostructures
  • MoS
  • photodetectors

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