Controllable Nonclassical Conductance Switching in Nanoscale Phase-Separated (PbI2)1−x(BiI3)x Layered Crystals

Grant C.B. Alexander, Patrick W. Krantz, Hee Joon Jung, Samuel Kenneth Davis, Yaobin Xu, Vinayak P. Dravid, Venkat Chandrasekhar, Mercouri G. Kanatzidis*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Layered 2D (PbI2)1−x(BiI3)x materials exhibit a nonlinear dependence in structural and charge transport properties unanticipated from the combination of PbI2 and BiI3. Within (PbI2)1−x(BiI3)x crystals, phase integration yields deceptive structural features, while phase boundary separation leads to new conductance switching behavior observed as large peaks in current during current–voltage (I–V) measurements (±100 V). Temperature- and time-dependent electrical measurements demonstrate that the behavior is attributed to ionic transport perpendicular to the layers. High-resolution transmission electron microscopy reveals that the structure of (PbI2)1−x(BiI3)x is a “brick wall” consisting of two phases, Pb-rich and Bi-rich. These brick-like features are 10s nm a side and it is posited that iodide ion transport at the interfaces of these regions is responsible for the conductance switching action.

Original languageEnglish (US)
Article number2103098
JournalAdvanced Materials
Volume33
Issue number51
DOIs
StatePublished - Dec 23 2021

Keywords

  • conductance switching
  • nanoscale crystals
  • nonlinear charge transport
  • phase separation

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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