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Manipulating the insulator–metal transition through tip-induced hydrogenation

Journal Article · · Nature Materials
 [1];  [2];  [3];  [2];  [2];  [2];  [2];  [2];  [4];  [2];  [2];  [2];  [5];  [5];  [2];  [6]
  1. Tsinghua Univ., Beijing (China); Southeast Univ., Nanjing (China)
  2. Tsinghua Univ., Beijing (China)
  3. Pacific Northwest National Laboratory (PNNL), Richland, WA (United States); East China Normal Univ. (ECNU), Shanghai (China)
  4. Chinese Academy of Sciences (CAS), Beijing (China)
  5. Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
  6. Tsinghua Univ., Beijing (China); Frontier Science Center for Quantum Information, Beijing (China)
Manipulating the insulator–metal transition in strongly correlated materials has attracted a broad range of research activity due to its promising applications in, for example, memories, electrochromic windows and optical modulators. Electric-field-controlled hydrogenation using ionic liquids and solid electrolytes is a useful strategy to obtain the insulator–metal transition with corresponding electron filling, but faces technical challenges for miniaturization due to the complicated device architecture. Here, in this work, we demonstrate reversible electric-field control of nanoscale hydrogenation into VO2 with a tunable insulator–metal transition using a scanning probe. The Pt-coated probe serves as an efficient catalyst to split hydrogen molecules, while the positive-biased voltage accelerates hydrogen ions between the tip and sample surface to facilitate their incorporation, leading to non-volatile transformation from insulating VO2 into conducting HxVO2. Remarkably, a negative-biased voltage triggers dehydrogenation to restore the insulating VO2. This work demonstrates a local and reversible electric-field-controlled insulator–metal transition through hydrogen evolution and presents a versatile pathway to exploit multiple functional devices at the nanoscale.
Research Organization:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC05-76RL01830
OSTI ID:
1995090
Report Number(s):
PNNL-SA-159760
Journal Information:
Nature Materials, Journal Name: Nature Materials Journal Issue: 11 Vol. 21; ISSN 1476-1122
Publisher:
Springer NatureCopyright Statement
Country of Publication:
United States
Language:
English

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