Figure 4: Linearity and time response.
From: High photoresponsivity in an all-graphene p–n vertical junction photodetector
(a) Irradiance-dependent PC densities of D4 device at different forward-bias voltages from 1 to 5 V. (b) Frequency-dependent PC response of D4 device at different forward-bias voltages from 1 to 5 V. (c) Repeated PC response switching of D4 device at different forward-bias voltages from 1 to 5 V. (d) Transient PCs of D4 device at different forward-bias voltages from 0 to 4.5 V in 0.5 V step. The PC switching and transient behaviours were measured by using 20 ps, 20 Hz Nd:YAG laser pulses at 532 nm.
