期刊
ULTRASONICS
卷 120, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.ultras.2021.106660
关键词
Piezoelectric semiconductor; Variable cross section; PN junction
资金
- National Natural Science Foundation of China [12172171, 12061131013, 11972276]
- State Key Laboratory of Mechanics and Control of Mechanical Structures at NUAA [MCMS-E-0520K02]
- Fundamental Research Funds for the Central Universities [NE2020002, NS2019007]
- National Natural Science Foundation of China for Creative Research Groups [51921003]
- National Natural Science Foundation of Jiangsu Province [BK20211176]
- Postgraduate Research & Practice Innovation Program of Jiangsu Province [KYCX21_0179]
- Local Science and Technology Development Fund Projects Guided by the Central Government [2021Szvup061]
- NUAA
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- Russian Ministry of Science and Higher Education [13.1902.21.0010]
Non-uniform mechanical strain induced by piezoactive acoustic waves can greatly enhance the piezotronic effect in a non-uniform piezoelectric semiconductive PN junction. The acoustoelectric fields in the space charge region are more sensitive to applied mechanical forces, especially in heterogeneous junctions. The current-voltage relations of a necking junction can be easily modulated by mechanical forces. These findings provide guidance for piezotronic device design.
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.
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