Fig. 2: Low-light illumination photocurrent transients.
From: Light-intensity-dependent photoresponse time of organic photodetectors and its molecular origin
a The bandwidth of frequency response at photocurrent density of 2.7 µA/cm2 with the light intensity of 0.024 mW/cm2 at 0 V. b NP-SA:C60 device photocurrent transient measured by charge extraction (CE) at 0 V. c MPTA:C60 device photocurrent transient measured by CE at 0 V. d A comparison of current transients measured at 0.5 mW/cm2. The photocurrent transient of MPTA:C60 is fitted with a double exponential decay function (green dash line). e Light intensity dependent SPV magnitude for NP-SA and MPTA blends, normalized to the SPV at the maximum light intensity. The normalized SPV signal during one illumination cycle at the lowest light intensity is shown in the inset. f Schematic demonstration of charge extraction of shallow and deep trapped charge carriers.
