The Design and Fabrication of a Pt/Ge/Pt/HfO₂ Multilayer for High-Temperature Infrared Selective Radiation

Area of Science:

• Materials Science
• Nanotechnology
• Infrared Optics

Background:

• Spectrally selective films are crucial for managing infrared radiation from high-temperature surfaces.
• Conventional low-emissivity films face heat dissipation limitations and lose spectral selectivity at high temperatures due to elemental diffusion.
• Metal-induced crystallization (MIC) in multilayer structures degrades film performance.

Purpose of the Study:

• To develop a spectrally selective film with enhanced thermal stability for high-temperature applications.
• To overcome the limitations of traditional metal/semiconductor multilayer films susceptible to MIC.
• To improve infrared emissivity control in demanding thermal environments.

Main Methods:

• Fabrication of a multilayer Pt/Ge/Pt/HfO2 film designed for thermal stability.
• Utilizing a thermal activation effect to form a crystalline Germanium (Ge) layer.
• Investigating the inhibition of interdiffusion between Platinum (Pt) and Ge layers via MIC.

Main Results:

• The improved Pt/Ge/Pt/HfO2 (I-PGPH) film exhibits superior thermal stability compared to normal PGPH.
• The I-PGPH film maintains spectral selectivity at operating temperatures up to 600 °C, an increase from 400 °C.
• Achieved low emissivity of 0.18/0.39 in 3-5/8-14 μm bands and high emissivity of 0.75 in the 5-8 μm range at 600 °C.

Conclusions:

• The proposed I-PGPH film demonstrates enhanced spectral selectivity and thermal stability.
• This approach effectively inhibits elemental diffusion at high temperatures, preserving film performance.
• The spectrally selective films offer significant potential for advanced high-temperature engineered applications.