Hafnium oxide deposition (CVD)

The equipment required for this process are a CVD and a plasma cleaner for removing impurities after the Hafnium oxide deposition

Since HfCl₄ is a solid salt at room temperature, we need to first create a liquid precursor, and use direct liquid injection for using it in our CVD.

The process is based on a Japanese paper and requires a complex precursor.

The synthesis of the Hf precursor TDEAH (Hf(NEt2)4) is so complex, that it needs its own page.

Precursor injection

Introduce TDEAH gas into the deposition chamber using a bubbling system, use N₂ as the carrier gas. To prevent liquefaction of the source before it enters the deposition chamber, maintain the line from the bubbler to the chamber at a temperature of 85°C.

Step 2

CVD setup

Vapor pressure