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Open AccessArticle

Fundamental Definitions for Axially-Strained Piezo-Semiconductive Nanostructures

Department of Electronic Engineering, University of Rome Tor Vergata, 00133 Roma, Italy
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Author to whom correspondence should be addressed.
Micromachines 2021, 12(1), 20; https://doi.org/10.3390/mi12010020
Received: 30 November 2020 / Revised: 19 December 2020 / Accepted: 24 December 2020 / Published: 27 December 2020
Piezoelectric nanotransducers may offer key advantages in comparison with conventional piezoelectrics, including more choices for types of mechanical input, positions of the contacts, dimensionalities and shapes. However, since most piezoelectric nanostructures are also semiconductive, modeling becomes significantly more intricate and, therefore, the effects of free charges have been considered only in a few studies. Moreover, the available reports are complicated by the absence of proper nomenclature and figures of merit. Besides, some of the previous analyses are incomplete. For instance, the local piezopotential and free charges within axially strained conical piezo-semiconductive nanowires have only been systematically investigated for very low doping (1016 cm−3) and under compression. Here we give the definitions for the enhancement, depletion, base and tip piezopotentials, their characteristic lengths and both the tip-to-base and the depletion-to-enhancement piezopotential-ratios. As an example, we use these definitions for analyzing the local piezopotential and free charges in n-type ZnO truncated conical nanostructures with different doping levels (intrinsic, 1016 cm−3, 1017 cm−3) for both axial compression and traction. The definitions and concepts presented here may offer insight for designing high performance piezosemiconductive nanotransducers. View Full-Text
Keywords: piezoelectric nanotransducers; depletion piezopotential; enhancement piezopotential; base piezopotential; tip piezopotential; characteristic lengths of piezopotentials; depletion-to-enhancement piezopotential ratio; tip-to-base piezopotential ratio; piezoelectric nanogenerators; piezotronics piezoelectric nanotransducers; depletion piezopotential; enhancement piezopotential; base piezopotential; tip piezopotential; characteristic lengths of piezopotentials; depletion-to-enhancement piezopotential ratio; tip-to-base piezopotential ratio; piezoelectric nanogenerators; piezotronics
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MDPI and ACS Style

Amiri, P.; Falconi, C. Fundamental Definitions for Axially-Strained Piezo-Semiconductive Nanostructures. Micromachines 2021, 12, 20. https://doi.org/10.3390/mi12010020

AMA Style

Amiri P, Falconi C. Fundamental Definitions for Axially-Strained Piezo-Semiconductive Nanostructures. Micromachines. 2021; 12(1):20. https://doi.org/10.3390/mi12010020

Chicago/Turabian Style

Amiri, Peyman; Falconi, Christian. 2021. "Fundamental Definitions for Axially-Strained Piezo-Semiconductive Nanostructures" Micromachines 12, no. 1: 20. https://doi.org/10.3390/mi12010020

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