Oxygen Vacancy Dynamics at Room Temperature in Oxide Heterostructures

Area of Science:

• Materials Science
• Solid-State Chemistry
• Oxide Electronics

Background:

• Oxygen vacancies significantly influence the properties of complex oxides.
• Understanding oxygen dynamics is crucial for developing advanced electronic devices.
• Room temperature operation is highly desirable for practical applications.

Purpose of the Study:

• To investigate the dynamic behavior of oxygen vacancies at room temperature in complex oxide heterostructures.
• To explore the influence of ion liquid gating on oxygen redox dynamics.
• To demonstrate reversible and nonvolatile resistive switching.

Main Methods:

• Fabrication of PrBaCo2O5+δ/Gd2O3-doped CeO2 epitaxial thin film heterostructures on Y2O3-stabilized ZrO2 substrates.
• Utilized ion liquid gating technique combined with in situ resistance measurements.
• Applied gating voltage and varied pulse durations to probe oxygen dynamics.

Main Results:

• Precisely detected oxygen dynamic changes in response to gating voltage and duration.
• Observed a reversible and nonvolatile resistive switching phenomenon.
• Achieved resistive switching at room temperature with a gating voltage >13.5 V and pulse duration >1 s.

Conclusions:

• Demonstrated the feasibility of controlling oxygen vacancy dynamics at room temperature using ion liquid gating.
• The observed resistive switching behavior offers potential for novel memory and neuromorphic computing applications.
• Highlights the importance of PrBaCo2O5+δ/Gd2O3-doped CeO2 heterostructures for future oxide electronics.