Patent ID: 6156485
Filing Date: 2000-12-05
Classification: H01L

Abstract:
A method of forming a high selectivity metal etch masking film comprising the steps of:providing a semiconductor substrate having a substructure of devices, and a first metal layer formed thereon;forming a dielectric layer over said first metal layer;forming a glue layer over said dielectric layer;forming a second metal layer over said glue layer;forming a W-hardmask layer over said second metal layer, wherein said hardmask layer is formed by silicon reduction of tungsten hexafluoride, WF.sub.6 at a flow rate between about 10 to 200 sccm, at pressure between about 1 to 100 torr, and temperature between about 350 to 500.degree. C.;forming a bottom anti-reflective coating (BARC) over said W-hardmask layer;forming an organic BARC layer over said W-hardmask layer;forming a photoresist layer over said BARC;forming said photoresist layer with metal pattern;etching said metal pattern into said BARC and W-hardmask layer underlying said photoresist layer;removing said photoresist layer;removing said organic BARC layer; andtransferring said line pattern in W-hardmask layer into said second metal layer, thus completing the patterning of said metal layer.