Journal
JOURNAL OF APPLIED PHYSICS
Volume 116, Issue 12, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4895050
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Funding
- EPSRC
- Intel Ireland
- EPSRC [EP/H023666/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/H023666/1] Funding Source: researchfish
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The characteristics of polycrystalline BaTiO3 metal-insulator-metal capacitors, fabricated using pulsed laser deposition, are investigated from room temperature to 420K. The capacitance-voltage characteristics show ferroelectric behaviour at room temperature, with a phase transition to paraelectric at higher temperature. However, the permittivity response shows paraelectric behaviour across all measured temperatures. So BaTiO3 exists here in a mixture of cubic and tetragonal phases. The BaTiO3 films have a columnar structure, with grain size increasing with film thickness due to their increasing height but not diameter. This correlates with an increase in remnant polarization. The results support a size driven phase transition in thin films of polycrystalline BaTiO3. (C) 2014 AIP Publishing LLC.
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