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

Abstract

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 × 10⁸ 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 × 10¹⁴ 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.