Impact of PN junction inhomogeneity on the piezoelectric fields of acoustic waves in piezo-semiconductive fibers

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Fang, Kai, Li, Peng, Li, Nian, Liu, Dianzi, Qian, Zhenghua, Kolesov, Vladimir and Kuznetsova, Iren (2022) Impact of PN junction inhomogeneity on the piezoelectric fields of acoustic waves in piezo-semiconductive fibers. Ultrasonics, 120. ISSN 0041-624X

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Abstract

Non-uniform mechanical strain can be easily induced at the interface of a piezoelectric semiconductive (PS) PN junction with variable cross sections by using piezoactive acoustic waves, and thus produces a giant piezoelectric field to significantly enhance the piezotronic effect. For revealing the piezotronic performance modulation in the non-uniform PS PN junction, the electromechanical field under a pair of applied end mechanical forces is studied from perspectives of theoretical analysis and numerical simulations. A one-dimensional linearized model for the PS fiber is established, which is applied for the mechanical analysis of a selected profile with the cross section varying in a specific quadratic function. Numerical results indicate that the acoustoelectric fields in the space charge region of the non-uniform PS PN junction are more sensitive to the applied mechanical forces, compared with that of the uniform junction, especially for a heterogeneous PN junction. Furthermore, the current-voltage relations of a necking PS PN junction can be modulated more easily by the end mechanical forces. Both qualitative conclusions and quantitative results can offer guidance for the piezotronic device design.

Item Type: Article
Faculty \ School: Faculty of Science > School of Engineering
Depositing User: LivePure Connector
Date Deposited: 10 Dec 2021 07:30
Last Modified: 09 Dec 2022 01:38
URI: https://ueaeprints.uea.ac.uk/id/eprint/82627
DOI: 10.1016/j.ultras.2021.106660

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