Specific Process Knowledge/Thermal Process/Annealing

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Annealing

At Danchip we have three furnaces and an RTP (Rapid thermal annealing) that can be used annealing: C1, C3, Noble furnace and Jipelec RTP. Annealing normally takes place in an N₂ atmosphere. PECVD PBSG glass is annealed in a wet atmosphere which will also oxidize the silicon substrate.

The recipes for oxidation are made so that a 20 minutes N₂ annealing step is included after the oxiation step.

Comparison of the annealing furnaces

	C1: Anneal Oxide	C3: Anneal Bond	Noble furnace	Jipelec RTP
General description	Annealing of 4" and 6" wafers. Annealing of wafers from the LPCVD furnaces and PECVD2.	Annealing of wafers from EVG-NIL, PECVD3 and wafers with aluminum.	Annealing of almost all materials on silicon wafers.	Rapid thermal annealing
Annealing gas	N2	N2 Ar Wet annealing with bobbler (water steam + N2)	N2 Ar	N2 Vacuum is possible
Process temperature	700 oC - 1100 oC	700 oC - 1150 oC	20 oC - 1000 oC	20 oC - 1000 oC Ramp up to 300 C/min
Substrate and Batch size	Small samples on a carrier wafer, horizontal 1-30 50 mm wafers 1-30 100 mm wafers 1-30 150 mm wafers	Small samples on a carrier wafer, horizontal 1-30 50 mm wafers 1-30 100 mm wafers	Small samples on a carrier wafer, horizontal 1-25 50 mm wafers 1-25 100 mm wafers, vertical and horizontal	Small samples on a carrier wafer, horizontal One 100 mm wafers on a carrier wafer
Allowed materials	All processed wafers have to be RCA cleaned, except wafers from LPCVD furnaces and PECVD1.	All processed wafers have to be RCA cleaned, except wafers from EVG-NIL, PECVD3 and wafers for annealing of aluminum.	Almost all materials, permission is needed.	III-V samples Silicon wafers Some metals