Patent ID: 8581153
Filing Date: 2013-11-12
Classification: C23C,H01L

Abstract:
1. A method of detecting an abnormal placement of a substrate, which is carried out when a film deposition process is performed to a substrate placed on a substrate table, in which a heater is disposed, by supplying a material gas and heating the substrate, the method comprising the steps of: during processing of the substrate, based on data representing one or more of supply power to the heater, supply current to the heater, and supply voltage to the heater, or representing a measured temperature of the substrate table, calculating a difference between a maximum value and a minimum value of said data; carrying out an operation to obtain an operation result by using the difference calculated and a difference between a maximum value and a minimum value of one or more of the supply power to the heater, the supply current to the heater, and the supply voltage to the heater, or of the measured temperature of the substrate table, which corresponding difference was obtained in processing of a previous substrate; and judging of the abnormal placement of the substrate by comparing the operation result with a predetermined threshold value.