Ion-beam deposited platinum as electrical contacting material in operando electron microscopy experiments at elevated...

Area of Science:

• Materials Science
• Surface Science
• Analytical Chemistry

Background:

• Operando electron microscopy demands stable electrical contacts for high-temperature device analysis.
• Platinum (Pt) is a potential candidate for such applications due to its properties.

Purpose of the Study:

• To investigate the nanostructure and electrical conductivity of ion beam deposited Pt.
• To determine the stability limits of Pt contacts at elevated temperatures and high current densities.
• To optimize Pt deposition parameters for enhanced stability and reduced electrical resistance.

Main Methods:

• Ion beam deposition of platinum films.
• In-situ electrical conductivity measurements under vacuum and oxygen atmospheres.
• Temperature-dependent characterization of microstructure and electrical properties.
• Analysis of current density effects on Pt film stability.

Main Results:

• Ion beam deposited Pt exhibits good microstructural stability up to approximately 800°C and 100 kA/cm².
• Electrical conductivity increases with temperature, primarily due to film densification.
• Resistivity is reduced by increasing ion current during deposition and by post-deposition annealing in oxygen.

Conclusions:

• Ion beam deposited Pt is a viable contacting material for operando electron microscopy at elevated temperatures.
• Optimized deposition and annealing procedures can enhance the performance of Pt contacts.
• The study provides practical recommendations for utilizing Pt in demanding microscopy applications.