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Issue 11, 2020
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Two-dimensional perovskites as sensitive strain sensors

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Two-dimensional (2D) organic–inorganic lead halide perovskites have attracted intensive attention for optoelectronic applications. Principally, strain-induced octahedral distortion in these materials may open up new application scope through modulation of carrier transport. However, they have never been explored as strain sensors. Moreover, traditional strain sensors are troubled by their limited sensitivity at a low strain ratio (<20%), which restricts their use to detect barely visible impact damage. Here, for the first time, we assembled a two-dimensional perovskite (C4H9NH3)2PbBr4 into a strain sensor, providing a high sensitivity (gauge factor ∼141) at an ultralow strain ratio of 0.16% and reversible stretchability. BA2PbBr4 has a positive Poisson's ratio, and its carrier mobilities monotonously decrease upon applying strains. As a prototype, we have integrated this BA2PbBr4 strain sensor into a wearable sensor and successfully detected the motion of finger bending and running.

Graphical abstract: Two-dimensional perovskites as sensitive strain sensors

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Article information

24 Nov 2019
24 Jan 2020
First published
27 Jan 2020

J. Mater. Chem. C, 2020,8, 3814-3820
Article type

Two-dimensional perovskites as sensitive strain sensors

M. Xia, J. Yuan, J. Luo, W. Pan, H. Wu, Q. Chen, K. Xue, X. Miao, G. Niu and J. Tang, J. Mater. Chem. C, 2020, 8, 3814
DOI: 10.1039/C9TC06437K

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