Nonvolatile Organic Heterojunction Transistors for Encrypted Optoelectronics

ABSTRACT Phototransistors with high sensitivity and signal gain have unique application potential in optical encryption technology. In this work, a PTCDI‐C 8 /C8‐BTBT organic heterojunction phototransistor (OHPTs) with interface modification was designed, the performance of OHPTs under different interface modifications was compared. The electrical transfer curves of the OHPTs with PVP modified exhibit a wide memory window of up to 92 V, which is because a large number of hydroxyl groups on the surface of the PVP film capture electrons. Under light stimulation, OHPTs exhibits a negative photoresponse and has excellent nonvolatile optical memory, after more than 1000 s of tracking, the current shows almost no attenuation. Finally, based on the array of OHPTs, the simulation of optical encryption applications was completed. Under light stimulation, information can be hidden, and multiple pieces of information can be encoded optically, providing new ideas for the future development of optical encryption technology.