A graphene/WS2/MoS2 stack detects light with responsivity up to 4.4×10^6 A/W at 30 fW by using a MoS2 floating quantum well to gate the graphene channel.
Recent Progress in Infrared Detector Technologies
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Highly Sensitive, Fast Graphene Photodetector with Responsivity $>10^6$ A/W Using Floating Quantum Well Gate
A graphene/WS2/MoS2 stack detects light with responsivity up to 4.4×10^6 A/W at 30 fW by using a MoS2 floating quantum well to gate the graphene channel.