Fabrication of aluminium doped zinc oxide piezoelectric thin film on a silicon substrate for piezoelectric MEMS energy harvesters

Aliza Aini Md Ralib, Anis Nurashikin Nordin, Hanim Salleh, Raihan Othman

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

Thin film piezoelectric materials play an essential role in micro electro mechanical system (MEMS) energy harvesting due to its low power requirement and high available energy densities. Non-ferroelectric piezoelectric materials such as ZnO and AlN are highly silicon compatible making it suitable for MEMS energy harvesters in self-powered microsystems. This work primarily describe the design, simulation and fabrication of aluminium doped zinc oxide (AZO) cantilever beam deposited on <100> silicon substrate. AZO was chosen due its high piezoelectric coupling coefficient, ease of deposition and excellent bonding with silicon substrate. Doping of ZnO with Al has improved the electrical properties, conductivity and thermal stability. The proposed design operates in transversal mode (d31 mode) which was structured as a parallel plated capacitor using Si/Al/AZO/Al layers. The highlight of this work is the successful design and fabrication of Al/AZO/Al on <100> silicon as the substrate to make the device CMOS compatible for electronic functionality integration. Design and finite element modeling was conducted using COMSOL™ software to estimate the resonance frequency. RF Magnetron sputtering was chosen as the deposition method for aluminium and AZO. Material characterization was performed using X-ray diffraction and field emission scanning electron microscopy to evaluate the piezoelectric qualities, surface morphology and the cross section. The fabricated energy harvester generated 1.61 V open circuit output voltage at 7.77 MHz resonance frequency. The experimental results agreed with the simulation results. The measured output voltage is sufficient for low power wireless sensor nodes as an alternative power sources to traditional chemical batteries.

Original languageEnglish
Pages (from-to)1761-1769
Number of pages9
JournalMicrosystem Technologies
Volume18
Issue number11
DOIs
Publication statusPublished - Nov 2012

Fingerprint

Zinc Oxide
Harvesters
Silicon
Zinc oxide
Aluminum
zinc oxides
aluminum
Fabrication
Thin films
fabrication
silicon
Substrates
thin films
Piezoelectric materials
energy
Energy harvesting
cantilever beams
output
Microsystems
Cantilever beams

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Hardware and Architecture
  • Electrical and Electronic Engineering

Cite this

Md Ralib, Aliza Aini ; Nordin, Anis Nurashikin ; Salleh, Hanim ; Othman, Raihan. / Fabrication of aluminium doped zinc oxide piezoelectric thin film on a silicon substrate for piezoelectric MEMS energy harvesters. In: Microsystem Technologies. 2012 ; Vol. 18, No. 11. pp. 1761-1769.
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Fabrication of aluminium doped zinc oxide piezoelectric thin film on a silicon substrate for piezoelectric MEMS energy harvesters. / Md Ralib, Aliza Aini; Nordin, Anis Nurashikin; Salleh, Hanim; Othman, Raihan.

In: Microsystem Technologies, Vol. 18, No. 11, 11.2012, p. 1761-1769.

Research output: Contribution to journalArticle

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