Patent ID: 6165905
Filing Date: 2000-12-26
Classification: H01L

Abstract:
A method of making a via hole in a semiconductor structure, the via hole having a surface layer of hydrophobic material, the via hole comprising an outer layer of material having a characteristic of spin on glass materials, the characteristic being that the outer layer oxidizes during photoresist ashing to form a surface layer of silicon dioxide in the hole; the method comprising the operation of:performing a chemical dehydroxylation operation after the ashing on the surface layer of silicon dioxide to convert the surface layer of silicon dioxide to the surface layer of hydrophobic material, the performing of the operation of chemical dehydroxylation being by the operations of:placing the semiconductor structure in a closed process chamber, the semiconductor structure having the via hole with the surface layer of silicon dioxide;admitting into the process chamber a halogen compound configured to facilitate the chemical dehydroxylation operation chamber until the pressure in the chamber is from about 1.5 to about 3 atmospheres;maintaining a temperature in the chamber from about 100 degrees C to less than about 450 degrees C; andperforming the admitting and maintaining operations for a period ranging between about 1 minute and about 4 minutes.