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Journal of Electronic Materials

, Volume 47, Issue 2, pp 973–981 | Cite as

Free-Standing β-Ga2O3 Thin Diaphragms

  • Xu-Qian Zheng
  • Jaesung Lee
  • Subrina Rafique
  • Lu Han
  • Christian A. Zorman
  • Hongping Zhao
  • Philip X.-L. FengEmail author
Topical Collection: 59th Electronic Materials Conference 2017
Part of the following topical collections:
  1. 59th Electronic Materials Conference 2017

Abstract

Free-standing, very thin, single-crystal β-gallium oxide (β-Ga2O3) diaphragms have been constructed and their dynamical mechanical properties characterized by noncontact, noninvasive optical measurements harnessing the multimode nanomechanical resonances of these suspended nanostructures. We synthesized single-crystal β-Ga2O3 using low-pressure chemical vapor deposition (LPCVD) on a 3C-SiC epilayer grown on Si substrate at temperature of 950°C for 1.5 h. The synthesized single-crystal nanoflakes had widths of ∼ 2 μm to 30 μm and thicknesses of ∼ 20 nm to 140 nm, from which we fabricated free-standing circular drumhead β-Ga2O3 diaphragms with thicknesses of ∼ 23 nm to 73 nm and diameters of ∼ 3.2 μm and ∼ 5.2 μm using a dry stamp-transfer technique. Based on measurements of multiple flexural-mode mechanical resonances using ultrasensitive laser interferometric detection and performing thermal annealing at 250°C for 1.5 h, we quantified the effects of annealing and adsorption of atmospheric gas molecules on the resonant characteristics of the diaphragms. Furthermore, we studied the effects of structural nonidealities on these free-standing β-Ga2O3 nanoscale diaphragms. We present extensive characterization of the mechanical and optical properties of free-standing β-Ga2O3 diaphragms, paving the way for realization of resonant transducers using such nanomechanical structures for use in applications including gas sensing and ultraviolet radiation detection.

Keywords

β-Gallium oxide (β-Ga2O3suspended nanostructure nanomechanics resonance nanoelectromechanical systems (NEMS) thermal annealing 

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Copyright information

© The Minerals, Metals & Materials Society 2017

Authors and Affiliations

  1. 1.Department of Electrical Engineering and Computer Science, Case School of EngineeringCase Western Reserve UniversityClevelandUSA

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