Integration of Nanoscale and Macroscale Graphene Heterostructures for Flexible and Multi-Level Non-Volatile Photoelectronic Memory

he development of optical memory with attractive features such as long-lasting, non-volatility, high-speed, and low-energy consumption is vitally important in the information age. Owing to these advantages, optical memory has been popular for more 10 years. Recently, flexibility has become desirable for the application of wearable devices and smart artificial intelligence; for conventional optical memory, this is still difficult to achieve. To combine optical memory with soft materials, this study presents a flexible and photoelectronic switchable multi-level memory device with long-lasting non-volatile properties. Based on the integration of nanoscale (graphene nanoflakes) and macroscale graphene heterojunctions, device achieves switchable memory states up to 196 distinct levels under the illuminations of lasers with different wavelengths. The photoelectronic memory device can be written optically and erased by both optical and electric ways. Additionally, the device possesses several unique features inc...