Process Steps for High Quality Si-Based Epitaxial Growth at Low Temperature via RPCVD

Area of Science:

• Materials Science
• Semiconductor Manufacturing

Background:

• High-quality silicon (Si)-based epitaxial films are crucial for advanced semiconductor devices.
• Reduced Pressure Chemical Vapor Deposition (RPCVD) is a key technique for Si epitaxy.

Purpose of the Study:

• To investigate and optimize critical process steps for growing high-quality Si-based epitaxial films using RPCVD.
• To identify the impact of ex-situ cleaning, in-situ bake, and wafer loading on epitaxial film quality.

Main Methods:

• Comparative analysis of different ex-situ cleaning methods (wet, dry, combined).
• Investigation of in-situ hydrogen (H2) bake temperatures and the effect of hydrogen chloride (HCl) addition.
• Evaluation of wafer loading conditions (temperature and environment: vacuum vs. gas).

Main Results:

• Combined wet and dry ex-situ cleaning provides the best results.
• In-situ bake effectiveness increases with temperature up to 850 °C; HCl addition allows effective baking at 700 °C.
• Loading wafers at low temperature in a gaseous environment improves epitaxial film quality.

Conclusions:

• Careful optimization of ex-situ cleaning, in-situ bake, and wafer loading is essential for achieving high-quality Si epitaxial growth via RPCVD.
• Specific process parameters significantly influence impurity levels and film quality.