Beyond Transistor Miniaturization: A Single‐Device Approach to Reconfigurable Logic Gates in 2D Organic Single‐Crystalline Heterojunctions

Reconfigurable device architectures are crucial for overcoming the scaling limitations of organic electronics. In this study, a single‐device platform is presented that integrates transistor, rectifier, and logic gate functionalities using molecularly thin 2D organic single‐crystalline heterojunctions. The reconfigurable asymmetric heterojunction (RAH), featuring a drain‐aligned p–n interface, enables polarity‐controlled switching between Fowler–Nordheim tunneling and thermally activated injection, achieving a record rectification ratio of 1.1 × 10 8 and a dynamic rectification window spanning eight orders of magnitude. The asymmetric injection also induces a significant bias‐polarity‐dependent photoresponse, with a maximum photoresponsivity of 788 A W −1 and a specific detectivity of 1.17 × 10 14 Jones under positive bias, and a substantially suppressed photoresponse due to heterointerface recombination under negative bias. The synergistic interplay between electrostatic gating and bias‐modulated photocarrier transport further enables real‐time reconfiguration between AND and OR logic operations within a single device, effectively doubling functional density. These results position 2D RAHs as building blocks for compact, reconfigurable optoelectronic circuits.