Polymorphous Dimer Chain-Dependent Structural Evolution and Phase-Change Electronic Switching in Triclinic Vanadium Dioxide
Polymorphous Dimer Chain-Dependent Structural Evolution and Phase-Change Electronic Switching in Triclinic Vanadium Dioxide
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DOI：
10.1021/acs.jpcc.3c00194
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发表时间：
2023-04
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二氧化钒(VO2)中的绝缘体-金属转变(IMT)在室温附近引起了人们对新型相变电子器件和光学器件的极大兴趣。IMT行为总是与VO2晶格中钒-钒(V-V)链的演化和扭曲密切相关。了解二聚体链的进化对于探索多形性VO2的IMT起源是必要的，但也是具有挑战性的。在这里，我们介绍了三斜相VO2薄膜中多态二聚体的链相关微结构和相应的IMT行为。这种晶面间距的减小和声子振动的移位可能源于三斜VO2中周期V-V链的变化。我们试图了解三斜相VO2薄膜中多形微结构和IMT行为的演变。V-V链的最小周期距离可能是决定三斜VO2的晶型和IMT温度(TIMT)的关键。我们相信，这种IMT及其结构的演化将有助于理解相关VO2中的IMT机制，并有助于构建先进的相变晶体管和光学器件。
Insulator–metal transition (IMT) in vanadium dioxide (VO2) near room temperature has attracted great interest in emerging phase-change electronic and optical devices. The IMT behaviors always connect closely to the evolution and distortion of vanadium–vanadium (V–V) chains in the VO2lattice. It is essential but challenging to understand the dimer-chain evolutions in pursuit of the IMT origins in polymorphous VO2. Here, we presented the polymorphous dimer chain-dependent microstructures and corresponding IMT behaviors in the triclinic VO2thin films. The decreased interplanar spacing and shifted phonon vibrations have been demonstrated and may originate from the variation of the periodic V–V chains in the triclinic VO2. We attempted to understand the evolutions of polymorphous microstructures and IMT behaviors in the triclinic VO2thin films. The least periodic distance of V–V chain may be critical to determine the polymorphs and the IMT temperature (TIMT) in the triclinic VO2. We believe that such IMT and structural evolutions would be helpful for the understanding of the IMT mechanism in correlated VO2and the construction of advanced phase-change transistors and optical devices.