Patent ID: 6218319
Filing Date: 2001-04-17
Classification: C23C,H01L

Abstract:
A method of forming an arsenic silicon glass (ASG) film onto a semiconductor wafer comprising the steps of:a) providing a vertical hot LPCVD reactor having a processing chamber with a vertical boat containing a plurality of wafers of a lot to be processed that are disposed horizontally;b) providing a first gas flow into the reactor, the first gas flow containing tetraethylorthosilicate (TEOS) gas flowing from the bottom to the top of the chamber;c) providing a second gas flow into the reactor, the second gas flow containing triethylarsenate (TEASAT) gas flowing from the bottom to the top of the chamber;d) providing a third gas flow into the reactor, the third gas flow containing oxygen (O2) gas flowing from the bottom to the top of the chamber; ande) controlling the third gas flow separately from the first gas flow and the second gas flow,so that a non-interactive co-pyrolysis between TEOS and TEASAT is produced due to the oxygen in the third gas flow, thereby allowing conformal deposition of an ASG film onto the wafer with a high degree of thickness and arsenic concentration uniformity within a same wafer and from wafer to wafer of the lot.