Patent ID: 11967512
Assignee: KOKUSAI ELECTRIC CORPORATION
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 16:
17. A method of manufacturing a semiconductor device using the apparatus of claim 1 comprising:
(a) inserting a first boat accommodating a plurality of substrates into a reaction tube through a furnace opening provided at one end of the reaction tube;
(b) heating the plurality of the substrates by a plurality of heaters provided on an outer periphery of the reaction tube and respectively in a plurality of zones arranged along a tube axis direction from the furnace opening to another end of the reaction tube;
(c) measuring temperatures of the zones or temperatures of the heaters respectively corresponding to the plurality of the zones, wherein the plurality of the zones comprise upper zones and lower zones located closer to the furnace opening than the upper zones are located, the upper zones being located over a height range equivalent to that of the substrates accommodated in the first boat whereas the lower zones being located within a height range excluding that of the substrates accommodated in the first boat, and the plurality of the heaters comprising upper heaters of the upper zones and lower heaters of the lower zones; and
(d) controlling electric power supplied to the plurality of the heaters based on temperature data obtained by a plurality of temperature sensors such that temperatures of the upper heaters reach a first temperature of around 1,250° C. or higher, temperatures of the lower zones are lower than temperatures of the upper zones, and forming a temperature gradient in the lower zones such that a temperature decreases toward the furnace opening.