Controllable Nonclassical Conductance Switching in Nanoscale Phase‐Separated (PbI2)1−x(BiI3)x Layered Crystals
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.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Oct 15, 2021
- Source ID
- 10.1002/adma.202103098
Entities
People
- Grant C. B. Alexander
- Hee Joon Jung
- Mercouri Kanatzidis
- Patrick Krantz
- Samuel Kenneth Davis
- Venkat Chandrasekhar
- Vinayak P. Dravid
- Yaobin Xu
Organizations
- Army Research Office
- National Science Foundation
- Northwestern University