Figure 14.

a) Schematic of a GeSe photodetector. b) I–V characteristicsc under dark and light illumination with different power intensities. c) Charge carrier transport via thermionic emission; Inset: Illustration of carrier transport under illumination. d) Normalized photocurrent as a function of the incident light polarization angle θ. e) Optical image of the device used for anisotropic electrical measurements (the scale bar is 10 µm). f) Angle‐resolved mobility at different temperatures from 60 to 300 K. g) Temperature‐dependent mobility ratio (μ _armchair/μ _zigzag) along the armchair and zigzag directions. Adapted with permission.^{[ 188 ]} Copyright 2018, Wiley‐VCH. h) Schematic diagram of a setup used for angle‐resolved transport measurements. i) Polarized angle dependent I–V curves under dark and illumination with 633 nm laser; j) 2D color map of the angle‐resolved transport in GeSe. Reproduced with permission.^{[ 193 ]} Copyright 2019, American Chemical Society.