Fig. 4: Effect of channel length scaling on the photoresponse properties of lateral channel devices. | Nature Communications

Fig. 4: Effect of channel length scaling on the photoresponse properties of lateral channel devices.

From: High-sensitivity, high-speed, broadband mid-infrared photodetector enabled by a van der Waals heterostructure with a vertical transport channel

Fig. 4

a Optical image of a BP/MoS2 heterojunction with six pairs of electrodes of different channel lengths varying from 13.7 µm to 112.3 µm. b Time-resolved photoresponse for lateral devices with different channel lengths measured at Vds = 0 V under 1550 nm laser illumination. c Responsivity and external quantum efficiency as a function of lateral channel length under 1550 nm laser illumination at Vds = 0 V. d Extracted rising time and decay time as a function of lateral channel length under 633 nm laser illumination at Vds = 0 V.

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