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

Autor: Hee Joon Jung, Yaobin Xu, Vinayak P. Dravid, Patrick Krantz, Grant C. B. Alexander, Mercouri G. Kanatzidis, Venkat Chandrasekhar, Samuel Davis
Rok vydání: 2021
Předmět:
Zdroj: Advanced Materials. 33:2103098
ISSN: 1521-4095
0935-9648
Popis: 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.
Databáze: OpenAIRE
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