Making a high speed interconnect system with refractory non-dogb

Details Making a high speed interconnect system with refractory non-dogb Making a high speed interconnect system with refractory non-dogb

1989-05-02

1990-10-09

Hearn, Brian E.

Fishing, trapping, and vermin destroying

428651, 357 67, H01L 2144, H01L 2148

Patent

active

049620606

ABSTRACT:
An interconnect (16',18', 18"), whose interlevel contacts comprise refractory (10) to refractory or refractory to semiconductor substrate (13) interfaces, comprises patterned refractory core portions (10), consisting of tungsten or molybdenum, having top portions (10a) and opposed side portions (10b), provided with sidewall spacers (32a) of aluminum, gold or copper or alloys thereof and formed on surfaces (12a) of insulating layers (12). The sidewall spacers afford lateral low resistivity cladding of the refractory portions as well as suppression of the electromigration failure modes of voiding and whiskering, while leaving the top portion of the core portions available for refractory to refractory contacts and the bottom portion of the core portions available for refractory to refractory or refractory to silicon contacts. In this manner, an interconnect system is provided which has low electrical resistivity but which avoids the much poorer electromigration performance associated with aluminum to aluminum, aluminum to silicon, or aluminum to refractory contact-making as well as with industry-standard bilayer structures comprising refractory/aluminum for interconnect-making.

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