Patent ID: 8649893

Claim:
A semiconductor manufacturing device comprising: a chamber in which a wafer is disposed; a sensor configured to detect an index value indicating a state within the chamber; a sticking probability calculating section configured to determine a value of a sticking probability of particles sticking to a chamber wall of the chamber based on a value of the detected index value; an acting section capable of varying the sticking probability in the chamber; and a control section configured to control the acting section so that the value of the sticking probability determined by the sticking probability calculating section is a predetermined value, wherein, the index value is an emission intensity of particles, the sensor detects an initial value of the emission intensity of particles and thereafter detects a present value of the emission intensity of particles at predetermined time intervals, and when an absolute value of a difference between the present value of the emission intensity of particles and the initial value of the emission intensity of particles exceeds a threshold value, the sticking probability calculating section determines the value of the sticking probability based on the present value of the emission intensity of particles detected by the sensor, the sticking probability calculating section referring to a sticking probability database that holds values of the sticking probability associated with corresponding values of the emission intensity of particles to determine the value of the sticking probability.