Full control of polarization in ferroelectric thin films using growth temperature to modulate defects
| Autor: | Christian Weymann, Jean-Marc Triscone, Stephanie Fernandez-Pena, Patrycja Paruch, Céline Lichtensteiger, Aaron B. Naden, Liv R. Dedon, Lane W. Martin |
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| Přispěvatelé: | EPSRC, University of St Andrews. School of Chemistry |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Diffraction
built‐ Materials science NDAS ddc:500.2 02 engineering and technology 010402 general chemistry Epitaxy 01 natural sciences Condensed Matter::Materials Science chemistry.chemical_compound Lead titanate Scanning transmission electron microscopy QD Boundary value problem Electrical and Electronic Engineering Thin film Spectroscopy Condensed matter physics Polarization control Defect dipoles Materials Engineering 021001 nanoscience & nanotechnology Polarization (waves) Ferroelectric thin films QD Chemistry 0104 chemical sciences Electronic Optical and Magnetic Materials chemistry in voltage 0210 nano-technology Built-in voltage |
| Zdroj: | Advanced Electronic Materials, vol 6, iss 12 Advanced Electronic Materials, Vol. 6, No 12 (2020) P. 2000852 |
| ISSN: | 2199-160X |
| Popis: | P.P. and C.W. acknowledge partial support by Swiss National Science Foundation Division II grant 200021_178782. L.R.D. acknowledges support from the US National Science Foundation under grant DMR‐1708615. L.W.M. acknowledges support from the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Materials Sciences and Engineering Division under Contract No. DE‐AC02‐05‐CH11231 (Materials Project program KC23MP) for the growth and study of defect structures in ferroic materials. A.B.N. gratefully acknowledges support from the Engineering and Physics Sciences Research Council (EPSRC) through grants EP/R023751/1 and EP/L017008/1. Deterministic control of the intrinsic polarization state of ferroelectric thin films is essential for device applications. Independently of the well-established role of electrostatic boundary conditions and epitaxial strain, the importance of growth temperature as a tool to stabilize a target polarization state during thin film growth is shown here. Full control of the intrinsic polarization orientation of PbTiO3 thin films is demonstrated-from monodomain up, through polydomain, to monodomain down as imaged by piezoresponse force microscopy-using changes in the film growth temperature. X-ray diffraction and scanning transmission electron microscopy reveal a variation of c-axis related to out-of-plane strain gradients. These measurements, supported by Ginzburg-Landau-Devonshire free energy calculations and Rutherford backscattering spectroscopy, point to a defect mediated polarization gradient initiated by a temperature dependent effective built-in field during growth, allowing polarization control not only under specific growth conditions, but ex-situ, for subsequent processing and device applications. Publisher PDF |
| Databáze: | OpenAIRE |
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