Coupled polarization dynamics and charge tunneling enable reconfigurable heterojunctions.

Abstract

Layered CuInP₂S₆ provides robust ferroelectric polarization and strong local fields, enabling low-voltage, nonvolatile modulation, multilevel states, and analog weight updates for neuromorphic devices. However, devices driven solely by CuInP₂S₆ suffer from limited tunability and single-mechanism control inadequate for large-scale complementary logic and heterogeneous integration. In this work, we construct a ferroelectric heterostructure that simultaneously regulates ferroelectric polarization and charge tunneling, enabling nonvolatile memory operation with an on/off ratio exceeding 10⁶, endurance up to 10⁵ cycles, and stable retention of 16 distinct memory states for over 10³s. The distinct modulation effects of polarization and tunneling on channel transport enable controllably reconfigurable adjustment, yielding a high diode rectification ratio. By exploiting the difference between the coercive voltage and the tunneling threshold, multimode regulation of junction configurations (including nn, np, pp, and pn junctions) is realized. In addition, the device achieves logic-in-memory functionality within a single cell. Such a coupled polarization dynamics and tunneling effect enables the device to achieve high integration, energy efficiency, and multifunctionality, effectively reducing circuit complexity for next-generation intelligent computing, sensing, and edge applications.