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Nature Materials

Resumen/Descripción – provisto por la editorial en inglés

Nature Materials is a monthly multi-disciplinary journal aimed at bringing together cutting-edge research across the entire spectrum of materials science and engineering. Materials research is a diverse and fast-growing discipline, which has moved from a largely applied, engineering focus to a position where it has an increasing impact on other classical disciplines such as physics, chemistry and biology. Nature Materials covers all applied and fundamental aspects of the synthesis/processing, structure/composition, properties and performance of materials, where "materials" are identified as substances in the condensed states (liquid, solid, colloidal) designed or manipulated for technological ends.

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Información

Tipo de recurso:

revistas

ISSN impreso

1476-1122

ISSN electrónico

1476-4660

Editor responsable

Springer Nature

País de edición

Reino Unido

Fecha de publicación

2001-

Cobertura temática

Ciencias físicas

Ciencias químicas

Ingeniería mecánica

Ingeniería de los materiales

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doi: 10.1038/s41563-023-01612-2

Li iontronics in single-crystalline T-Nb2O5 thin films with vertical ionic transport channels

Hyeon Han; Quentin Jacquet; Zhen Jiang; Farheen N. Sayed; Jae-Chun Jeon; Arpit Sharma; Aaron M. Schankler; Arvin Kakekhani; Holger L. Meyerheim; Jucheol Park; Sang Yeol Nam; Kent J. Griffith; Laura Simonelli; Andrew M. Rappe; Clare P. Grey; Stuart S. P. Parkin

<jats:title>Abstract</jats:title><jats:p>The niobium oxide polymorph <jats:italic>T</jats:italic>-Nb<jats:sub>2</jats:sub>O<jats:sub>5</jats:sub> has been extensively investigated in its bulk form especially for applications in fast-charging batteries and electrochemical (pseudo)capacitors. Its crystal structure, which has two-dimensional (2D) layers with very low steric hindrance, allows for fast Li-ion migration. However, since its discovery in 1941, the growth of single-crystalline thin films and its electronic applications have not yet been realized, probably due to its large orthorhombic unit cell along with the existence of many polymorphs. Here we demonstrate the epitaxial growth of single-crystalline <jats:italic>T</jats:italic>-Nb<jats:sub>2</jats:sub>O<jats:sub>5</jats:sub> thin films, critically with the ionic transport channels oriented perpendicular to the film’s surface. These vertical 2D channels enable fast Li-ion migration, which we show gives rise to a colossal insulator–metal transition, where the resistivity drops by 11 orders of magnitude due to the population of the initially empty Nb 4<jats:italic>d</jats:italic><jats:sup>0</jats:sup> states by electrons. Moreover, we reveal multiple unexplored phase transitions with distinct crystal and electronic structures over a wide range of Li-ion concentrations by comprehensive in situ experiments and theoretical calculations, which allow for the reversible and repeatable manipulation of these phases and their distinct electronic properties. This work paves the way for the exploration of novel thin films with ionic channels and their potential applications.</jats:p>