Tetraethoxysilane → HCID 87198141, compound

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Reaction Steps

Turning next to FIG. 7, an ozone-TEOS oxide layer 12 is refilled into the trench 10 and formed on the PE-TEOS oxide layer 8 for isolation. The ozone-TEOS oxide layer 12 indicates that a silicon dioxide is formed by CVD using source gases including TEOS and ozone. The ozone-TEOS is preferably formed by using sub-atmospheric chemical vapor deposition (SACVD). The ozone-TEOS layer is formed at a temperature in the range of about 400 to 480° C. The quality of the SACVD ozone-TEOS oxide 12 that is formed on the silicon is good. Conversely, while the SACVD ozone-TEOS oxide 12 is formed on the PE-TEOS oxide layer 8, the quality of the SACVD ozone-TEOS oxide 12 is poor. The reason of forming the PE-TEOS oxide layer 8 is to make sure the ozone-TEOS layer formed over the trench 10 with better quality than the neighboring ozone-TEOS oxide 12 on the PE-TEOS oxide layer 8. In addition, the wet etching rate of the ozone-TEOS oxide 12 formed on the PE-TEOS oxide layer 8 is about 2000 to 2200 angstroms/minutes, while the one of the ozone-TEOS oxide 12 on the silicon oxide layer 6 is about 300 to 360 angstroms/minutes. The ozone-TEOS oxide 12 formed on the silicon 2 having wet etching rate is about 300 to 320 angstroms/minutes. Thus, the ozone-TEOS oxide 12 formed on the PE-TEOS oxide layer 8 will be removed faster than the one formed on the silicon substrate 2.

Provenance & Evidence