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a) Bandgap versus exciton binding energy of existing 2D and bulk materials. Reproduced with permission.[ 213 ] Copyright 2017, American Physical Society. b) schematic of two‐probe monolayer devices. Photocurrent along armchair and zigzag direction for c,d) GeS, e,f) GeSe, g,h) SnS, and i,j) SnSe monolayer; the vertical axis is the polarizing angle and the horizontal one the photon energy. Reproduced with permission.[ 41 ] Copyright 2017, Royal Society of Chemistry.
