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 language | English (US) |
---|---|
Article number | 2103098 |
Journal | Advanced Materials |
Volume | 33 |
Issue number | 51 |
DOIs | |
State | Published - Dec 23 2021 |
Funding
This work was supported by the Army Research Office (Grant W911NF1910335). The authors acknowledge EPIC facility of Northwestern University's NU Center, which has received support from the Soft and Hybrid Nanotechnology Experimental (SHyNE) Resource (NSF ECCS‐1542205); the MRSEC IRG2 program (NSF DMR‐1720139) at the Materials Research Center; the International Institute for Nanotechnology (IIN); the Keck Foundation; and the State of Illinois, through the IIN. Work at Argonne National Laboratory was supported by the U.S. Department of Energy, Office of Science, Basic Energy Science, Materials Sciences and Engineering Division. ANCE
Keywords
- conductance switching
- nanoscale crystals
- nonlinear charge transport
- phase separation
ASJC Scopus subject areas
- General Materials Science
- Mechanics of Materials
- Mechanical Engineering