Figure 3.

FeCl${}_3$-FLG Photodetectors. (a) laser-defined p-p’ junction in FeCl${}_3$-FLG device, $E_{CNP}$ is the charge neutrality point and $E_F$ is the Fermi level; (b) scanning photocurrent ($I_{ph}$) maps before (top) and after (bottom) laser-irradiation along the white dashed lines. Red dashed lines delimit the FeCl${}_3$-FLG flake, laser wavelength was $375\mathrm{nm}$. Adapted and reprinted with permission from De Sanctis et al. [14], under CC-BY license from AAAS, 2017; (c) schematic of a multi-terminal hexagonal-domain FeCl${}_3$-FLG photodetector and measurement circuit; (d) photocurrent ($I_{ph}$, top) and charge density ($n_h$, bottom) extrapolated from the corresponding maps (right panels); green shaded areas represent maxima and minima of the photocurrent which correspond to a change in charge density. Reproduced with permission from De Sanctis et al. [70], under CC-BY license from IOP Publishing Ltd. (Bristol, UK), 2017.