Figure 1.
Design and operation principle of TPPS device. a) The diagram of the prepared TPPS array with dual‐side photoreception. The right side is a single device structure of PeG heterobilayer with rGO planar electrodes. b) The diagram of a biological synapse, optical spike serves as a presynaptic input spike, channel current as stimulated postsynaptic current. The charge transfer at the heterojunction interface is analogous to the release of neurotransmitter in biosynapse. c) UV–vis transmission spectrum of electrode, PeG and TPPS device. d) The wide light responsivity (ultraviolet, visible and near‐infrared) of device. e) The excitatory postsynaptic current of synapse is induced by a 365 nm light pulse with 1.44 µW mm−2 from upper or bottom sides. f,g) Energy band diagram of PeG with and without light stimuli, respectively.