Inventors:
Richard A. Conti - Katonah NY
Daniel C. Edelstein - White Plains NY
Gill Yong Lee - Wappingers Falls NY
Assignee:
International Business Machines Corporation - Armonk NY
Infineon Technologies AG - Munich
International Classification:
H01C 2131
US Classification:
438778, 438695, 438697, 438712, 438723, 438761, 438781, 438618, 438620, 438622, 438626, 438627, 438628, 42725528, 42725539, 427255393, 427569, 427578, 427579
Abstract:
A method is described for forming a low-k dielectric film, in particular, a pre-metal dielectric (PMD) on a semiconductor wafer which has good gap-filling characteristics. The method uses a thermal sub-atmospheric CVD process that includes a carbon-containing organometallic precusor such as TMCTS or OMCTS, an ozone-containing gas, and a source of dopants for gettering alkali elements and for lowering the reflow temperature of the dielectric while attaining the desired low-k and gap-filling properties of the dielectric film. Phosphorous is a preferred dopant for gettering alkali elements such as sodium. Additional dopants for lowering the reflow temperature include, but are not limited to boron, germanium, arsenic, fluorine or combinations thereof.