2D Programmable Photodetectors Based on WSe 2 /h‐BN/Graphene Heterojunctions

Abstract Programmable photovoltaic photodetectors based on 2D materials can modulate optical and electronic signals in parallel, making them particularly well‐suited for optoelectronic hybrid dual‐channel communication. This work presents a programmable non‐volatile bipolar semi‐floating gate photovoltaic photodetector (SFG‐PD) constructed using tungsten diselenide (WSe 2 ), hexagonal boron nitride (h‐BN), and graphene (Gra). By controlling the voltage pulses applied to the control gate, the device generates opposing built‐in electric field junctions (p + ‐p and n‐p junctions), enabling reversible switching between positive and negative light responses with a rapid response time of up to 2.02 µs. Moreover, the application of this device is demonstrated in dual‐channel optoelectronic hybrid communication, offering a practical solution for achieving high‐speed, large‐capacity, low‐loss, and secure multi‐channel communication.