Fig. 4: The phototransistor based on the self-assembled TDPPQ nanosheet.

a The schematic illustration of the TDPPQ-nanosheet-based phototransistor. b Photocurrent responses of the TDPPQ-nanosheet-based phototransistor under the illumination of different monochromatic light (365 nm, 550 nm, 670 nm, 765 nm, and 940 nm) with a fixed light intensity of 600 μW cm−2. c Photoresponsivity and d photosensitivity of a representative device under the illumination of different monochromatic light (365 nm, 550 nm, 670 nm, 765 nm, and 940 nm) with a fixed light intensity of 600 μW cm−2