Laser activated polysilicon connections for redundancy

Details Laser activated polysilicon connections for redundancy Laser activated polysilicon connections for redundancy

H - Electricity

01

L

356/23

H01L 27/00 (2006.01) H01L 23/525 (2006.01)

Patent

CA 1186070

LASER ACTIVATED POLYSILICON CONNECTIONS FOR REDUNDANCY Abstract of the Disclosure An integrated circuit is fabricated with some redundant capacity by forming potential electrically conducting links which can subsequently be made electrically when extra circuit capacity is required. Field oxide is grown on a silicon substrate and then a layer of polysilicon deposited over the oxide. At the redundancy sites where electrical connections may subsequently be made, an anti-reflective silicon nitride coating is deposited and photodefined. The areas of this coating are used as masks in order to diffuse dopant into the polysilicon at parts of the polysilicon laterally adjacent the redundancy sites. When later it is necessary to bring spare capacity into the circuit the complete circuit is scanned with a continuous wave laser. The laser melts the polysilicon under the nitride mask permitting the dopant to diffuse from the adjacent parts of the polysilicon and so form a conducting link. However under parts of the polysilicon not covered by an anti-reflective coating the polysilicon is not melted by the laser beam and so its conductivity remains unchanged. The fabrication process is self-aligned since the intrinsic or undoped region of the polysilicon is the same as the region which is melted. The method for making the electrical links does not require precise positioning and focussing of the laser beam as in known methods. - i -

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