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Layer-dependent Anisotropic Frictional Behavior in Two-dimensional Monolayer Hybrid Perovskite/ITO Layered Heterojunctions

Abstract

Two-dimensional (2D) organic-inorganic hybrid perovskites, which possess outstanding optical and electrical properties, have proved to be promising semiconductor materials and attracted significant interests in widespread applications. Therefore, the understanding of the frictional behavior of 2D perovskite materials with other transparent conductive material, such as ITO, will provide promising development in optoelectronic devices. Here, lateral force atomic force microscopy (AFM) is employed to measure the frictional behavior between 2D (001) plane of organic-inorganic hybrid (C4H9NH3)2PbBr4 perovskites and ITO (111) plane, and the experimental realization of friction in signal-crystalline heterojunction is reported. The results for interfaces between 2D monolayer perovskites and ITO clearly demonstrate that a strong anisotropy of friction as four-fold symmetry with low frictional coefficient 0.035 in misaligned contact and 0.015 in aligned contact in the heterojunction configuration is observed. Atomistic simulations reveal that the underlying frictional mechanisms in the dynamical regimes. In addition, as a new phenomenon, the measured frictional anisotropy surprisingly depends on number of atomic layers in the 2D perovskite, which decreases significantly with the increasing of number of layers until the number of layers reaches 16 where frictional anisotropy becomes independent of the thickness. Our results are expected to be of a general nature and should be applicable to other 2D hybrid perovskites heterojunction configuration for the development in adaptive and stretchable optoelectronic nanodevices.

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Publication details

The article was received on 26 Oct 2018, accepted on 02 Jan 2019 and first published on 03 Jan 2019


Article type: Paper
DOI: 10.1039/C8CP06645K
Citation: Phys. Chem. Chem. Phys., 2019, Accepted Manuscript
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    Layer-dependent Anisotropic Frictional Behavior in Two-dimensional Monolayer Hybrid Perovskite/ITO Layered Heterojunctions

    S. Bi, Q. Li, Y. Yan, K. Asare-Yeboah, T. Ma, C. Tang, Z. Ouyang, Z. He, Y. Liu and C. Jiang, Phys. Chem. Chem. Phys., 2019, Accepted Manuscript , DOI: 10.1039/C8CP06645K

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