Tackling Polar Response in Oxygen Deficient KTaO₃ Thin Films

D. A. MotaIFIMUP and IN-Institute of Nanoscience and Nanotechnology, Department of Physics and Astronomy, Faculty of Science of University of Porto, Rua do Campo Alegre, 687, 4169-007Porto, Portugal

Y. Romaguera-Barcelay

A. TkachIFIMUP and IN-Institute of Nanoscience and Nanotechnology, Department of Physics and Astronomy, Faculty of Science of University of Porto, Rua do Campo Alegre, 687, 4169-007Porto, Portugal

J. Pérez de la CruzIFIMUP and IN-Institute of Nanoscience and Nanotechnology, Department of Physics and Astronomy, Faculty of Science of University of Porto, Rua do Campo Alegre, 687, 4169-007Porto, Portugal;INESC TEC, Rua do Campo Alegre, 687, 4169-007Porto, Portugal

P. M. VilarinhoDepartment of Ceramics and Glass Engineering, CICECO, University of Aveiro, 3810-193Aveiro, Portugal

P. B. TavaresCentro de Química, Universidade de Trás-os-Montes e Alto Douro, Apartado 1013, 5001-801 Vila Real, Portugal

J. Agostinho MoreiraIFIMUP and IN-Institute of Nanoscience and Nanotechnology, Department of Physics and Astronomy, Faculty of Science of University of Porto, Rua do Campo Alegre, 687, 4169-007Porto, Portugal

A. AlmeidaIFIMUP and IN-Institute of Nanoscience and Nanotechnology, Department of Physics and Astronomy, Faculty of Science of University of Porto, Rua do Campo Alegre, 687, 4169-007Porto, PortugalCorrespondence[email protected]

show all

Abstract

Oxygen deficient KTaO₃ thin films were grown by RF magnetron sputtering on Si/SiO₂/Ti/Pt substrates. Room temperature X-ray diffraction shows that they are under a compressive strain of 2.3%. Leakage current results reveal the presence of a conductive mechanism, following Poole-Frenkel formalism. The existence of a polar response below T_pol ∼ 367°C was ascertained by dielectric, polarization, and depolarization current measurements. A Cole-Cole dipolar relaxation was evidenced which is associated with oxygen vacancies induced dipoles. After annealing the films in an oxygen atmosphere above T_pol, the aforementioned polar response is suppressed, due to significant oxygen vacancies reduction.

Keywords:

Reprints and Corporate Permissions

Please note: Selecting permissions does not provide access to the full text of the article, please see our help page How do I view content?

To request a reprint or corporate permissions for this article, please click on the relevant link below:

Order Reprints Request Corporate Permissions

Academic Permissions

Please note: Selecting permissions does not provide access to the full text of the article, please see our help page How do I view content?

Obtain permissions instantly via Rightslink by clicking on the button below:

Request Academic Permissions

If you are unable to obtain permissions via Rightslink, please complete and submit this Permissions form. For more information, please visit our Permissions help page.

Tackling Polar Response in Oxygen Deficient KTaO₃ Thin Films

Information for

Open access

Opportunities

Help and information

Tackling Polar Response in Oxygen Deficient KTaO3 Thin Films

Abstract

Reprints and Corporate Permissions

Academic Permissions

Related research

To cite this article:

Download citation

Information for

Open access

Opportunities

Help and information

Keep up to date

Your download is now in progress and you may close this window

Login or register to access this feature

Tackling Polar Response in Oxygen Deficient KTaO₃ Thin Films