材料科学
电解质
晶体管
柔性电子器件
薄膜晶体管
光电子学
纳米技术
离子键合
半导体
电极
化学物理
电压
离子
图层(电子)
电气工程
物理化学
工程类
物理
化学
量子力学
作者
Dongdong Xu,Xing Deng,Yi‐Feng Zhao,Ruru Ma,Ni Zhong,Rong Huang,Hui Peng,Ping‐Hua Xiang,Chun‐Gang Duan
标识
DOI:10.1002/adfm.201902497
摘要
Abstract Electrolyte gating is widely adopted to electrically control the physical properties of materials, leading to numerous intriguing phenomena and various applications. However, the carrier modulation mechanism remains heavily controversial. Herein, using natural mica pieces as substrates and ionic gel as the dielectric layer, all‐transparent and flexible WO 3 transistor configuration is designed to in situ monitor the dynamic doping process of electrolyte gating. A reversible and vacuum‐dominant volatile/nonvolatile metal–insulator transition (MIT) is observed in electrolyte‐gated WO 3 thin films. In situ X‐ray diffraction experiments, together with first‐principles calculations, reveal an abrupt and symmetric structural evolution through two distinct hydrogenated metastable phases and phase separation progress. The fast volatility is assigned to a spontaneous dehydrogenation process. A prototype of a flexible vacuum meter is demonstrated on the basis of the unique vacuum‐dependent MIT, exhibiting a measurement range down to 1.0 × 10 −6 mbar and no injury of electromagnetic radiation. These findings bring new insights into hydrogenation dynamics, paving a feasible way for the realization of user‐friendly flexible electronics.
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