Figure 4.

Photoresponse of a 60 nm thick FASnI₃ PD fabricated on plastic substrate. a) I _ph versus drain voltage relationship under different light intensities at a wavelength of 685 nm. b) Illustration of the flexible PD subjected to bending test. c) Responsivity as a function of bias voltage for different red light intensity of the flexible PD. Circular and triangular dots are experimental data measured before and after bending for 300 times. d) Temporal response under two on–off illumination cycles, where top and bottom graphs are for performance measured before and after the mechanical testing, respectively.