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Surface Termination-Dependent Nanotribological Properties of Single-Crystal MAPbBr(3) Surfaces

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Title
Surface Termination-Dependent Nanotribological Properties of Single-Crystal MAPbBr(3) Surfaces
Author(s)
Joong Il Jake Choi; Muhammad Ejaz Khan; Zafer Hawash; Hyunhwa Lee; Luis K. Ono; Yabing Qi; Yong-Hoon Kim; Jeong Young Park
Publication Date
2020-01
Journal
JOURNAL OF PHYSICAL CHEMISTRY C, v.124, no.2, pp.1484 - 1491
Publisher
AMER CHEMICAL SOC
Abstract
Atomistic characterization of surface termination and the corresponding mechanical properties of single-crystal methylammonium lead tribromide (MAPbBr(3)) are performed using combined atomic force microscopy (AFM) measurements and density functional theory (DFT) calculations. A clean MAPbBr(3) surface is obtained by in situ cleavage in ultrahigh vacuum at room temperature, and the subsequent AFM measurements of the as-cleaved MAPbBr(3) exhibit the coexistence of two different surface terrace types with step height differences corresponding to about half the thickness of a PbI6 octahedron layer. Concurrent friction force microscopy measurements show that the two surfaces result in two distinct friction values. Based on DFT calculations, we attribute the higher-friction and lower-friction surfaces to MABr-terminated flat and PbBr2-terminated vacant surface terminations, respectively. The calculated electronic band structures of the various MABr- and PbBr2-terminated surfaces show that the midgap states are absent, revealing the defect-tolerant nature of the ideal single-crystal MAPbBr(3) surfaces. © 2019 American Chemical Society
URI
https://pr.ibs.re.kr/handle/8788114/7258
ISSN
1932-7447
Appears in Collections:
Center for Nanomaterials and Chemical Reactions(나노물질 및 화학반응 연구단) > Journal Papers (저널논문)
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