Fig. 2: Performance quantification of the TPTs.
From: Broadband nonlinear modulation of incoherent light using a transparent optoelectronic neuron array
a A photo of a 10 cm × 10 cm glass substrate coated with the MoS2 VDWTF, demonstrating large-area scalability and transparency. Scale bar: 2 cm. b A microscopic image of the TPT array. The gold wires are connected directly to Vdd. The vias (the small gold spots) connect to the ITO electrode covering the entire pixel area. Scale bar: 500 μm. The contrast is large despite the high transparency of the device since the microscope works in reflection mode. c The transmission spectrum of the VDWTF in the visible range (highlighted in yellow shade). d The photocurrent of a separately wired out TPT at sweeping source-drain bias under 633-nm laser. Black to red (lower to higher): under the illumination intensity of 0, 0.7, 6.0, 65.8, 220, 393, 531, 1740, 3140, and 5920 mW/cm2, respectively. Inset: the ratio of the channel current over dark current at different optical intensities. e The responsivity measured by a lock-in amplifier at different laser chopping frequencies. Blue: data from a 488-nm laser at 0.46 mW (4.6 W/cm2) on a single pixel; red: data from a 633-nm laser at 0.59 mW (5.9 W/cm2). Gray lines indicate the extrapolated 3 dB cutoff frequencies at 3.5 kHz and 4.7 kHz, respectively, which are above the chopping frequency available in our laboratory. f The ratio of the dark resistances over the light resistances of 116 TPTs, with a dark/light resistance ratio of 9.0 ± 1.3 (mean and standard deviation). The channel bias was 1 V for e and f.
