Broad‐Spectrum Multifunctional Optoelectronic Transistor Enabled by a Type‐II Organic p‐n Heterojunction for Advanced Secure Information Processing

ABSTRACT

Secure information transmission faces mounting challenges amid increasingly complex data processing and intrinsic physical limitations of conventional electronic systems. Multifunctional optoelectronic information platforms offer a promising route to overcome these constraints. Herein, we report a broad‐spectrum multifunctional optoelectronic transistor based on a type‐II organic p‐n heterojunction comprising p‐type C10‐DNTT and n‐type indandione‐terminated quinoidal compound Q4T‐4F. The extended π‐conjugation and quinoidal skeleton of Q4T‐4F significantly broaden its absorption spectrum, enabling the integration of broad‐spectrum photodetection, electrical synaptic emulation, and non‐volatile memory in a single device. The p‐n heterojunction transistor exhibits a broad spectral response from 300 to 1100 nm with a reconfigurable photoresponse modulated by both gate voltage and light intensity. Interface charge trapping endows the device with essential synaptic characteristics and robust multilevel non‐volatile memory performance. Leveraging these integrated functions, we demonstrate advanced applications including optical/electrical encryption‐decryption and reconfigurable logic gates. This work establishes a versatile platform for advancing optoelectronic systems toward secure and efficient information processing.