Fig. 3. Local laser-induced thermoelectric current mapping. (a) Optical image of the photodetector based on SWCNT–MoS2 hybrid films, which are marked by dashed lines with different colours. Scale bar: 5 μm. Raman mapping of MoS2 and SWCNT in the red rectangle region (right). Scale bar: 2 μm. (b) Spatial distribution of photocurrent induced by 532 nm laser illumination. Scale bar: 2 μm. (c) The current intensity profile of the same line cut along the centre of the channel. (d) Power-dependence of positive and negative currents. (e) Laser excitation induced temperature and carrier distribution in SWCNT–MoS2 heterostructures.
