Reconfigurable Optoelectronic Logic Gates With Wavelength‐Dependent Bipolar Photoresponse From ReS 2 /Gr/ h ‐BN/Gr Heterojunctions

ABSTRACT With the rapid growth of optical computing and integrated photonics, low‐power optoelectronic logic devices are essential for on‐chip information processing. Conventional implementations rely on multiple discrete components, limiting system scalability. We demonstrate a wavelength‐dependent bipolar optoelectronic logic device based on a ReS 2 /Gr/ h ‐BN/Gr van der Waals heterostructure. The fundamental mechanism is V OC ‐dictated: under 365 nm illumination, a substantial V OC magnitude defines a high‐capacity absorption response and a photovoltaic (PV) process, generating a negative photocurrent. In contrast, at 635 nm, a diminished V OC restricts the absorption response strength, yielding a positive photocurrent and enabling reversible PV polarity switching. This bipolarity is key to achieving “single‐device multifunctional logic.” By adjusting wavelength and power, a single physical unit reconfigures six fundamental logic gates (OR, AND, NOR, NAND, NOT, and XNOR), reducing the transistor count required for complex circuits by 87.5% compared to CMOS implementations. The device exhibits high responsivity (730 mA/W at 365 nm; 490 mA/W at 635 nm), a detectivity of 10 11 Jones, ultralow dark current of 15 pA, and sub‐microsecond working speed. This V OC ‐driven reconfigurable logic offers a compact, energy‐efficient pathway for integrated photonics and secure optical communication.