An atomic layer deposition chamber for in situ x-ray diffraction and scattering analysis

Area of Science:

• Materials Science
• Nanotechnology
• Solid State Physics

Background:

• The crystal structure of thin films critically influences their performance in applications like electronics and catalysis.
• Atomic Layer Deposition (ALD) is a key technique for precise thin film fabrication, but in situ monitoring of structural evolution is challenging.

Purpose of the Study:

• To design and demonstrate an ALD chamber enabling in situ X-ray analysis of crystal structure evolution during film growth.
• To provide real-time insights into how ALD processes affect thin film crystallinity.

Main Methods:

• Development of a specialized ALD chamber integrated with X-ray analysis capabilities.
• Utilizing synchrotron-based techniques including high-resolution X-ray diffraction (HRXRD), grazing incidence X-ray diffraction (GIXRD), and grazing incidence small-angle scattering (GISAXS).
• Demonstration using Platinum (Pt) ALD on amorphous silicon dioxide (SiO2) and strontium titanate (SrTiO3) substrates.

Main Results:

• The designed chamber successfully facilitates in situ monitoring of structural changes during ALD.
• Real-time crystallographic data was obtained, revealing the evolution of film structure.
• The study demonstrated the capability to analyze Pt ALD on different substrates, showcasing the chamber's versatility.

Conclusions:

• The developed in situ ALD chamber is a valuable tool for understanding and controlling thin film crystal structure.
• This technology allows for direct correlation between ALD process parameters and resulting film properties.
• The findings pave the way for optimizing thin film growth for enhanced performance in various applications.