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 language | English |
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Pages (from-to) | 8252-8262 |
Number of pages | 11 |
Journal | ACS Nano |
Volume | 10 |
Issue number | 9 |
DOIs | |
State | Published - 27 Sep 2016 |
Externally published | Yes |
Bibliographical note
Publisher Copyright:© 2016 American Chemical Society.
Keywords
- flexible optoelectronics
- graphene
- heterostructures
- MoS
- photodetectors