Patent ID: 6881681

Claim:
A method of depositing a film on product wafers, comprising: loading a boat with a plurality of filler wafers and a first plurality of product wafers; inserting the boat with the plurality of filler wafers and the first plurality of product wafers into a furnace; depositing a film by low pressure chemical vapor deposition in the furnace at a temperature below a first temperature on the first plurality of product wafers, the boat, and the plurality of filler wafers; removing the boat with the plurality of filler wafers and the first plurality of product wafers from the furnace; unloading the first plurality of product wafers from the boat; after unloading the first plurality of product wafers, inserting the boat with the plurality of filler wafers into the furnace; after inserting the boat with the plurality of filler wafers into the furnace, heating the furnace to a temperature greater than the first temperature; removing the boat from the furnace; loading a second plurality of product wafers into the boat; inserting the boat with the second plurality of product wafers and the plurality of filler wafers into the furnace; and depositing a film by low pressure chemical vapor deposition in the furnace on the second plurality of product wafers, the boat, and the plurality of filler wafers.