Two-Dimensional van der Waals Materials with Aligned In-Plane Polarization and Large Piezoelectric Effect for Self-Powered Piezoelectric Sensors

Dai, Mingjin, Wang, Zhiguo, Wang, Fakun, Qiu, Yunfeng, Zhang, Jia, Xu, Cheng-Yan, Zhai, Tianyou, Cao, Wenwu, Fu, Yong Qing, Jia, Dechang, Zhou, Yu and Hu, Ping-An (2019) Two-Dimensional van der Waals Materials with Aligned In-Plane Polarization and Large Piezoelectric Effect for Self-Powered Piezoelectric Sensors. Nano Letters, 19 (8). pp. 5410-5416. ISSN 1530-6984

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Official URL: https://doi.org/10.1021/acs.nanolett.9b01907

Abstract

Piezoelectric two-dimensional (2D) van der Waals (vdWs) materials are highly desirable for applications in miniaturized and flexible/wearable devices. However, the reverse-polarization between adjacent layers in current 2D layered materials results in decreasing their in-plane piezoelectric coefficients with layer number, which limits their practical applications. Here, we report a class of 2D layered materials with an identical orientation of in-plane polarization. Their piezoelectric coefficients (e22) increase with layer number, thereby allowing for the fabrication of flexible piezotronic devices with large piezoelectric responsivity and excellent mechanical durability. The piezoelectric outputs can reach up to 0.363 V for a 7-layer α-In2Se3 device, with a current responsivity of 598.1 pA for 1% strain, which is 1 order of magnitude higher than the values of the reported 2D piezoelectrics. The self-powered piezoelectric sensors made of these newly developed 2D layered materials have been successfully used for real-time health monitoring, proving their suitability for the fabrication of flexible piezotronic devices due to their large piezoelectric responses and excellent mechanical durability.

Item Type: Article
Uncontrolled Keywords: Indium selenide, asymmetric structure, stacking sequence, robust piezoelectricity, piezo-responsivity, sensors
Subjects: H600 Electronic and Electrical Engineering
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: Paul Burns
Date Deposited: 30 Jul 2019 12:54
Last Modified: 11 Oct 2019 12:46
URI: http://nrl.northumbria.ac.uk/id/eprint/40214

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