Self-powered and gate-reconfigurable photodetection and logic operations in the Ta₂PdS₆/WSe₂ van der Waals...

Self-powered photodetectors that operate without an external bias are highly desirable for next-generation optoelectronic systems, yet simultaneously achieving high responsivity, fast response, and electrical tunability remains challenging. Here, we demonstrate a van der Waals (vdW) heterostructure photodetector based on semiconducting quasi-one-dimensional Ta₂PdS₆ integrated with p-type WSe₂. The device exhibits a strong built-in potential of 521 meV, facilitating carrier separation and collection and a high responsivity of 381.3 mA W^-1 under self-powered operation. Electrostatic gating further modulates the interfacial band alignment, enhancing the built-in potential by ∼150 meV and boosting the responsivity more than twofold at -30 V. This gate tunability enables dynamic control of device operation, including reconfiguration between low-power and high-sensitivity imaging modes as well as AND/OR optoelectronic logic functions. Our findings highlight the multifunctional potential of Ta₂PdS₆/WSe₂ heterostructures, providing a versatile platform for adaptive photodetection and integrated optoelectronic computing and pointing toward future opportunities in broadband and reconfigurable device architectures.