Micro/Nanostructure Engineering of Epitaxial Piezoelectric α-Quartz Thin Films on Silicon
Qianzhe Zhang, David Sánchez-Fuentes, Rudy Desgarceaux, Pau Escofet-Majoral, Judith Oró-Soler, Jaume Gázquez, Guilhem Larrieu, Benoit Charlot, Andrés Gómez, Martí Gich, and Adrián Carretero-Genevrier*. ACS Appl. Mater. Interfaces 2019, XXXX, XXX, XXX-XXX
The monolithic integration of sub-micron quartz structures on silicon substrates is a key issue for the future development of piezoelectric devices as prospective sensors with applications based on the operation in the high-frequency range. However, to date, it has not been possible to make existing quartz manufacturing methods compatible with integration on silicon and structuration by top-down lithographic techniques. Here, we report an unprecedented large-scale fabrication of ordered arrays of piezoelectric epitaxial quartz nanostructures on silicon substrates by the combination of soft-chemistry and three lithographic techniques: (i) laser interference lithography, (ii) soft nanoimprint lithography on Sr-doped SiO2 sol–gel thin films, and (iii) self-assembled SrCO3 nanoparticle reactive nanomasks. Epitaxial α-quartz nanopillars with different diameters (from 1 μm down to 50 nm) and heights (up to 2 μm) were obtained. This work demonstrates the complementarity of soft-chemistry and top-down lithographic techniques for the patterning of epitaxial quartz thin films on silicon while preserving its epitaxial crystallinity and piezoelectric properties. These results open up the opportunity to develop a cost-effective on-chip integration of nanostructured piezoelectric α-quartz MEMS with enhanced sensing properties of relevance in different fields of application.
Related Topics: Oxides for new-generation electronics