Fig. 2: Mechanically abraded films for photodetection applications.
From: Heterostructures formed through abraded van der Waals materials
a Temporal response for three planar photodetectors abraded onto PET substrates, consisting of graphite–MoS2 (black), graphite–MoSe2 (blue) and graphite–WS2 (red). b I–Vb for an Au–WS2–CVD graphene top electrode with device area of 1 mm × 1 mm and WS2 film thickness of ~300 nm. c Spectral dependence of the photocurrent for the device shown in b. Inset: shows the temporal response of the photocurrent with biexponential decay fitted (red curve). d I–Vb curves for three representative graphite–WS2–MoS2–graphite devices. Inset: I–Vb curves for the top and bottom graphitic electrodes. e I–Vb curves for the device D2 shown in d with (red curve) and without (blue curve) white light excitation of 74 mW/cm2. Inset: temporal response of the short circuit photocurrent at Vb = 0 V. f Photovoltage map of one of our diode structures measured with a focussed laser (E = 3.05 eV) with a power output of 0.5 mW and a spot size of diameter 5 µm.
