Two-dimensional triphenylamine-based polymers for ultrastable volatile memory with ultrahigh on/off ratio

Two-dimensional (2D) memristive materials are of primary interest for resistive memory electronics. Herein, we report a high performance volatile dynamic-random-access memory (DRAM) based on 2D triphenylamine polymer. The 2D polymer was prepared via a solid-liquid interface limited polymerization method, with the merits of large-area, structure stability, and controllable film thicknesses. Utilizing the layered polymer as memristive medium in diode, the device shows a typical volatile DRAM performance. Impressively, the memory has an ultrahigh on/off current ratio up to 10⁷, as well as outstanding thermal stability approaching at 300 °C. Both current ratio and thermal stability are higher than most previous polymer DRAM memories. Our work provides an effective strategy to construct scalable and stable 2D polymers toward high performance memory.