Controllable Nonclassical Conductance Switching in Nanoscale Phase-Separated (PbI 2 ) 1- x (BiI 3 ) x Layered Crystals.

Autor: Alexander GCB; Department of Chemistry, Northwestern University, 2145 Sheridan Rd, Evanston, IL, 60208, USA., Krantz PW; Department of Physics, Northwestern University, 2145 Sheridan Rd, Evanston, IL, 60208, USA., Jung HJ; Department of Materials Science and Engineering, Northwestern University, 2145 Sheridan Rd, Evanston, IL, 60208, USA., Davis SK; Department of Physics, Northwestern University, 2145 Sheridan Rd, Evanston, IL, 60208, USA., Xu Y; Department of Materials Science and Engineering, Northwestern University, 2145 Sheridan Rd, Evanston, IL, 60208, USA., Dravid VP; Department of Materials Science and Engineering, Northwestern University, 2145 Sheridan Rd, Evanston, IL, 60208, USA., Chandrasekhar V; Department of Physics, Northwestern University, 2145 Sheridan Rd, Evanston, IL, 60208, USA., Kanatzidis MG; Department of Chemistry, Northwestern University, 2145 Sheridan Rd, Evanston, IL, 60208, USA.
Jazyk: angličtina
Zdroj: Advanced materials (Deerfield Beach, Fla.) [Adv Mater] 2021 Dec; Vol. 33 (51), pp. e2103098. Date of Electronic Publication: 2021 Oct 15.
DOI: 10.1002/adma.202103098
Abstrakt: Layered 2D (PbI 2 ) 1- x (BiI 3 ) x materials exhibit a nonlinear dependence in structural and charge transport properties unanticipated from the combination of PbI 2 and BiI 3 . Within (PbI 2 ) 1- x (BiI 3 ) 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 (PbI 2 ) 1- x (BiI 3 ) 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.
(© 2021 Wiley-VCH GmbH.)
Databáze: MEDLINE
Externí odkaz: