Multifunctional full-visible-spectrum optoelectronics based on a van der Waals heterostructure

Highlights: • An all-2D photoelectricl nonvolatile memory (NVM) device has been demonstrated based on ReSe₂ heterostructure (ReSe₂ HS). • ReSe₂ HS exhibits multilevel storage characteristic and excellent retention property. • The ReSe₂ HS can be achieved full-visible-spectrum light-programmable features in inverter and frequency doubler. • The ReSe₂ HS is proposed to build a power-saving imaging sensors for energy efficient digital camera systems. -- Abstract: Multifunctional devices are expected to allow development of low-cost, highly integrated, and energy-efficient electronics for the internet of things (IoT) era. Here, we demonstrate an all-two-dimensional ReSe₂/h-BN/graphene heterostructure (ReSe₂ HS) consisting of a vertically coupled ReSe₂ field-effect transistor and charge storage component, which possesses multifunctional characteristics for use in electronics and optoelectronics. As an electrically controlled non-volatile memory (NVM), the ReSe₂ HS delivers high-performance multilevel data storage with a readout on/off current ratio exceeding 10⁵ and excellent durability (>10⁴ s) at an ultralow V_ds of 50 mV, which benefits to the development of power saving devices. The ReSe₂ HS design and high-photoresponsivity ReSe₂ channel also achieve an energy efficient optical NVM with full-visible-spectrum distinction. Besides, the ReSe₂ HS displays unique ambipolarity to operate as either an inverter or frequency doubler. We further propose a power-free ReSe₂ HS optical memory matrix to simplify imaging systems. The ReSe₂ HS shows promise for use in light-programmable information storage systems and neuromorphic computation with low power consumption.