Fig. 4: Bolometer mode of the heterostructure.
From: A versatile photodetector assisted by photovoltaic and bolometric effects
a Resistance of the VO2/MoTe2 heterostructure as a function of temperature (red, heating; blue, cooling). The inset shows the extracted ΔIds and ΔT, in which ΔIds increases with ΔT with slopes of γ1 and γ2. b Schematic of the bolometer mode for detecting MWIR to LWIR. c Ids − Vds curves for different incident laser wavelengths (black, dark; green, 10 μm, 41.6 μW; blue, 4.2 μm, 40.6 μW; red, 2.8 μm, 37.1 μW). The inset shows the calculated responsivity for the three wavelengths as a function of Vds. d Temporal response of the photocurrent under laser illumination of 10 μm, 4.2 μm, and 2.8 μm. e Power dependence of the heterostructure. The responsivity rapidly increases when the laser power exceeds 157 μW, indicating the metal–insulator transformation. f Temporal response of the photocurrent under high-power laser illumination of 157 μW.
