Patent ID: 8746170
Filing Date: 2014-06-10
Classification: C23C,H01L,Y10T

Abstract:
1. A substrate process apparatus that performs a process with respect to a substrate under vacuum by supplying a process gas from a process gas supplying portion to the substrate placed on a susceptor in a vacuum chamber, the substrate process apparatus comprising: first and second evacuation passages through which the vacuum chamber is evacuated; a first pressure adjustment valve provided in the first evacuation passage; a second pressure adjustment valve provided in the second evacuation passage; a conductance adjustment portion provided in the second evacuation passage between the vacuum chamber and the second pressure adjustment valve in order to adjust conductance of the second evacuation passage, the second evacuation passage being divided by the conductance adjustment portion into a primary side located between the vacuum chamber and the conductance adjustment portion and a secondary side located between the second pressure adjustment valve and the conductance adjustment portion; a first pressure measurement instrument for measuring a pressure in the vacuum chamber; a differential pressure measurement portion that measures a differential pressure between the primary side and the secondary side of the second evacuation passage; a storage portion that stores data prescribing a relationship of the pressure in the vacuum chamber, an adjustment value of the conductance adjustment portion, a flow rate of gas to be evacuated through the second evacuation passage, and the differential pressure; and a control portion that reads out the pressure in the vacuum chamber, the adjustment value of the conductance adjustment portion, and the differential pressure which correspond to a set value of the flow rate of gas to be evacuated through the second evacuation passage from the data stored in the storage portion, and outputs instruction signals to the first pressure adjustment valve in order to adjust the pressure in the vacuum pressure to be the pressure read out from the data, to the conductance adjustment portion in order to adjust conductance in the second evacuation passage to be the adjustment value read out from the data, and to the second pressure adjustment valve in order to adjust a differential pressure across the conductance adjustment portion to be the differential value read-out from the data, wherein the each of the first and second evacuation passages is configured to separately evacuate different kinds of reaction gases, wherein the vacuum chamber includes a first evacuation port and a second evacuation port, the first evacuation port being connected to the first evacuation passage and the second evacuation port being connected to the second evacuation passage, and wherein the first and second evacuation ports are located in different positions with respect to a rotation direction of the susceptor.