Patent ID: 6602560
Filing Date: 2003-08-05
Classification: B08B,C23C

Abstract:
A method of removing residual fluorine in a high density plasma chemical vapor deposition (HDP-CVD) chamber used in processing fluorine-doped silicate glass comprising the steps of:forming a high density plasma in the presence of at least a microwave power, a silicon source, and an oxygen source whereby a silicon-rich oxide film having pores ranging from about 30 volume percent to about 90 volume percent of the total volume of said silicon-rich oxide film is deposited over at least part of the inner surface of the HDP-CVD chamber; conducting at least one deposition process of the fluorine-doped silicate glass in said HDP-CVD chamber generating residual fluorine for diffusing into said pores of said silicon-rich oxide film; flowing a process gas comprising NF3 into said HIDP-CVD chamber in the presence of microwave power to form a plasma thereby removing fluorine from said silicon-rich oxide film to form a fluorine-containing gas; and removing said fluorine-containing gas from said HDP-CVD chamber.