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We present flexible photodetectors (PDs) for visible wavelengths fabricatedby stacking centimetre-scale chemical vapour deposited (CVD) single layergraphene (SLG) and single layer CVD MoS2, both wet transferred onto a flexiblepolyethylene terephthalate substrate. The operation mechanism relies oninjection of photoexcited electrons from MoS2 to the SLG channel. The externalresponsivity is 45.5A/W and the internal 570A/W at 642nm. This is at least twoorders of magnitude higher than bulk-semiconductor flexible membranes and otherflexible PDs based on graphene and layered materials. The photoconductive gainis up to 4x10^5. The photocurrent is in the 0.1-100 uA range. The devices aresemi-transparent, with just 8% absorption at 642nm and work stably upon bendingto a curvature of 6cm. These capabilities and the low voltage operation (<1V)make them attractive for wearable applications.

High Responsivity, Large-Area Graphene/MoS2 Flexible Photodetectors