Hi Wang, what do you mean with "particle contamination" ? Maybe this article will help you: Materials Science in Semiconductor Processing 5 (2002) 5160 Here yuo will find also a lot of references Best regards, Andrea -----Messaggio originale----- Da: mems-talk-bounces@memsnet.org [mailto:mems-talk-bounces@memsnet.org] Per conto di ??? Inviato: lunedì 26 febbraio 2007 7.09 A: mems-talk@memsnet.org Oggetto: [mems-talk] Low Stress Si3N4 in LPCVD Hi all I need to deposite 0.3um LP Si3N4 on <100> Si wafer which is low stress(<300MPa) and Particle-free. I have search a lot of papers on internet ... The only way to get low stress Si3N4 is increasing DCS/NH3 ratio , but particle contamination is getting worse. Is there anyone can share informations about how to deposite low stress Si3N4 in LPCVD without particle contamination.