Size-Controlled Spalling of LaAlO3/SrTiO3 Micromembranes

Rasmus Tindal Dahm, Ricci Schüsler Erlandsen, Felix Trier, Alessia Sambri, Emiliano Di Gennaro, Anita Guarino, Lukas Stampfer, Dennis Valbjørn Christensen, Fabio Miletto Granozio, Thomas Sand Jespersen*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

The ability to form freestanding oxide membranes of nanoscale thickness is of great interest for enabling material functionality and for integrating oxides in flexible electronic and photonic technologies. Recently, a route has been demonstrated for forming conducting heterostructure membranes of LaAlO3 and SrTiO3, the canonical system for oxide electronics. In this route, the epitaxial growth of LaAlO3 on SrTiO3 resulted in a strained state that relaxed by producing freestanding membranes with random sizes and locations. Here, we extend the method to enable self-formed LaAlO3/SrTiO3 micromembranes with control over membrane position, their lateral sizes from 2 to 20 μm, and with controlled transfer to other substrates of choice. This method opens up the possibility to study and use the two-dimensional electron gas in LaAlO3/SrTiO3 membranes for advanced device concepts.

Original languageEnglish
JournalACS applied materials & interfaces
Volume13
Issue number10
Pages (from-to)12341–12346
ISSN1944-8244
DOIs
Publication statusPublished - 2021

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