Nanometer-Thick Sr2IrO4 FreestandingFilms for Flexible Electronics
2020
We report the structural
and optical properties of nanoscale Sr2IrO4 freestanding
thin films fabricated using a
water-soluble Sr3Al2O6 layer. The
coherent lattice structure, phonon modes, two-magnon Raman scattering,
and optical absorption spectra of the Sr2IrO4 nanomembrane are analogous to those of the layered iridate epitaxial
thin films and single crystals. Remarkably, the formation of 3-unit-cell-thick
SrIrO3 and interfacial composite layers alleviates the
antiphase boundaries at the Sr2IrO4/Sr3Al2O6 interface, resulting in structurally
robust nanomembranes. Our experimental results show that this freestanding
thin-film approach of layered oxides can provide techniques for tuning
or realizing unprecedented states beyond conventional thin-film methods,
suggesting a pathway in achieving flexible layered-oxide electronics.
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