High Density Plasma Enhanced Chemical Vapor Deposition (HD PECVD) is an alternative to the conventional methods of the deposition of silicon dioxide, silicon nitride and amorphous silicon using PECVD. The advantage of HD PECVD over PECVD is the ability to produce higher quality films at lower temperatures, less than 150C.
To maintain cleanliness level there are cleans required for both the chamber and wafers prior to processing -
Substrates in clean category: Pre-Diffusion Clean
For semi-clean substrates: Standard Metal Clean (SRS100 + PRS1000) . Run Chamber clean (no dummies) and conditioning with clean dummies prior to run