Photoassisted Electron–Ion Synergic Doping Induced Phase Transition of n-VO₂/p-GaN Thin-Film Heterojunction

Abstract

As a typical correlated metal oxide, vanadium dioxide (VO 2 ) shows specific metal−insulator transition (MIT) properties and demonstrates great potential applications in ultrafast optoelectronic switch, resistive memory, and neuromorphic devices. Effective control of the MIT process is essential for improving the device performance. In the current study, we have first proposed a photoassisted ion-doping method to modulate the phase transition of the VO 2 layer based on the photovoltaic effect and electron−ion synergic doping in acid solution. Experimental results show that, for the prepared n-VO 2 / p-GaN nanojunction, this photoassisted strategy can effectively dope the n-VO 2 layer by H + , Al 3+ , or Mg 2+ ions under light radiation and trigger consecutive insulator−metal−insulator transitions. If combined with standard lithography or electron beam etching processes, selective doping with nanoscale size area can also be achieved. This photoassisted doping method not only shows a facile route for MIT modulation via a doping route under ambient conditions but also supplies some clues for photosensitive detection in the future.

Enhanced Pd/a‐WO3/VO2 Hydrogen Gas Sensor Based on VO2 Phase Transition Layer

“…Then these H + ions were attracted into WO 3 layer via the electron–proton co‐doping process at the interface, resulting the metallization of H‐doped WO 3 layer. [ 45 ] Thus the resistance of a‐WO 3 layer decreased and the sensing conductance signal was detected synchronously. For the third stage (3) in Figure 5c, the sensor would be recovered to the initial state by introducing the synthetic air to the device.…”

Intelligent Off/On Switchable Microwave Absorption Performance of Reduced Graphene Oxide/VO2 Composite Aerogel

“…[ 33 ] This reversible transition with dramatic changes in electrical conductivity promises VO 2 a wide range of potential applications in optoelectronic, transistors, and antennas. [ 34–36 ]…”

“…[33] This reversible transition with dramatic changes in electrical conductivity promises VO 2 a wide range of potential applications in optoelectronic, transistors, and antennas. [34][35][36] For the first time, we developed a VO 2 /reduced graphene oxide composite aerogel with excellent off/on switchable MA performance. As temperature increases, the VO 2 -based materials show the real-time phase change behavior.…”

Reversible Nanomodulation of Thin Vanadium Dioxide Films by a Tip-Induced Electric Field

“…Among the family of strongly correlated materials, vanadium dioxide (VO 2 ) is renowned for its specific metal–insulator transition (MIT), which is accompanied by a structural phase conversion from the room temperature monoclinic insulating phase to the high-temperature rutile metallic phase . Recently, multitype phase transitions going beyond a regular thermal stimulus have been reported, and the VO 2 properties have found to be effectively tuned by strain, − ion implantation, optical excitation, and an electric stimulus. , These modulations greatly extend the available approaches to induce MIT and open many possibilities in developing novel VO 2 -based functional devices.…”