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Design and Fabrication of Bulk Micromachined 4H-SiC Piezoresistive Pressure Chips Based on Femtosecond Laser Technology
Silicon carbide (SiC) has promising potential for pressure sensing in a high temperature and harsh environment due to its outstanding material properties. In this work, a 4H-SiC piezoresistive pressure chip fabricated based on femtosecond laser technology was proposed. A 1030 nm, 200 fs Yb: KGW lase...
Autores principales: | , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2021
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7825030/ https://www.ncbi.nlm.nih.gov/pubmed/33418919 http://dx.doi.org/10.3390/mi12010056 |
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author | Wang, Lukang Zhao, You Zhao, Yulong Yang, Yu Gong, Taobo Hao, Le Ren, Wei |
author_facet | Wang, Lukang Zhao, You Zhao, Yulong Yang, Yu Gong, Taobo Hao, Le Ren, Wei |
author_sort | Wang, Lukang |
collection | PubMed |
description | Silicon carbide (SiC) has promising potential for pressure sensing in a high temperature and harsh environment due to its outstanding material properties. In this work, a 4H-SiC piezoresistive pressure chip fabricated based on femtosecond laser technology was proposed. A 1030 nm, 200 fs Yb: KGW laser with laser average powers of 1.5, 3 and 5 W was used to drill blind micro holes for achieving circular sensor diaphragms. An accurate per lap feed of 16.2 μm was obtained under laser average power of 1.5 W. After serialized laser processing, the machining depth error of no more than 2% and the surface roughness as low as 153 nm of the blind hole were measured. The homoepitaxial piezoresistors with a doping concentration of 10(19) cm(−3) were connected by a closed-loop Wheatstone bridge after a rapid thermal annealing process, with a specific contact resistivity of 9.7 × 10(−5) Ω cm(2). Our research paved the way for the integration of femtosecond laser micromachining and SiC pressure sensor chips manufacturing. |
format | Online Article Text |
id | pubmed-7825030 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-78250302021-01-24 Design and Fabrication of Bulk Micromachined 4H-SiC Piezoresistive Pressure Chips Based on Femtosecond Laser Technology Wang, Lukang Zhao, You Zhao, Yulong Yang, Yu Gong, Taobo Hao, Le Ren, Wei Micromachines (Basel) Article Silicon carbide (SiC) has promising potential for pressure sensing in a high temperature and harsh environment due to its outstanding material properties. In this work, a 4H-SiC piezoresistive pressure chip fabricated based on femtosecond laser technology was proposed. A 1030 nm, 200 fs Yb: KGW laser with laser average powers of 1.5, 3 and 5 W was used to drill blind micro holes for achieving circular sensor diaphragms. An accurate per lap feed of 16.2 μm was obtained under laser average power of 1.5 W. After serialized laser processing, the machining depth error of no more than 2% and the surface roughness as low as 153 nm of the blind hole were measured. The homoepitaxial piezoresistors with a doping concentration of 10(19) cm(−3) were connected by a closed-loop Wheatstone bridge after a rapid thermal annealing process, with a specific contact resistivity of 9.7 × 10(−5) Ω cm(2). Our research paved the way for the integration of femtosecond laser micromachining and SiC pressure sensor chips manufacturing. MDPI 2021-01-06 /pmc/articles/PMC7825030/ /pubmed/33418919 http://dx.doi.org/10.3390/mi12010056 Text en © 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Wang, Lukang Zhao, You Zhao, Yulong Yang, Yu Gong, Taobo Hao, Le Ren, Wei Design and Fabrication of Bulk Micromachined 4H-SiC Piezoresistive Pressure Chips Based on Femtosecond Laser Technology |
title | Design and Fabrication of Bulk Micromachined 4H-SiC Piezoresistive Pressure Chips Based on Femtosecond Laser Technology |
title_full | Design and Fabrication of Bulk Micromachined 4H-SiC Piezoresistive Pressure Chips Based on Femtosecond Laser Technology |
title_fullStr | Design and Fabrication of Bulk Micromachined 4H-SiC Piezoresistive Pressure Chips Based on Femtosecond Laser Technology |
title_full_unstemmed | Design and Fabrication of Bulk Micromachined 4H-SiC Piezoresistive Pressure Chips Based on Femtosecond Laser Technology |
title_short | Design and Fabrication of Bulk Micromachined 4H-SiC Piezoresistive Pressure Chips Based on Femtosecond Laser Technology |
title_sort | design and fabrication of bulk micromachined 4h-sic piezoresistive pressure chips based on femtosecond laser technology |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7825030/ https://www.ncbi.nlm.nih.gov/pubmed/33418919 http://dx.doi.org/10.3390/mi12010056 |
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