Patent ID: 7790478

Claim:
A manufacturing method of a semiconductor integrated circuit device, comprising the steps of: (a) introducing a first wafer in a wafer processing chamber of a plasma CVD apparatus having a first plasma excitation system; (b) performing a plasma CVD process on the first wafer introduced in the wafer processing chamber by plasma excitation using the first plasma excitation system; (c) after the step (b), discharging the first wafer to the outside from the wafer processing chamber; (d) after the step (c), performing remote plasma cleaning to the wafer processing chamber; (e) introducing a second wafer in the wafer processing chamber to which the remote plasma cleaning has been performed; and (f) performing the plasma CVD process on the second wafer introduced in the wafer processing chamber by plasma excitation using the first plasma excitation system, wherein the step (d) includes the sub steps of: (d1) plasma-exciting a cleaning gas using a second plasma excitation system in a remote plasma generation chamber provided outside the wafer processing chamber and transferring the excited cleaning gas into the wafer processing chamber; (d2) generating a local plasma in the wafer processing chamber or in a vacuum pumping system for evacuating the wafer processing chamber by plasma-exciting the cleaning gas using a third plasma excitation system of capacitively coupled type; (d3) detecting an end point of the remote plasma cleaning by monitoring electrical characteristic of the local plasma; and (d4) ending the remote plasma cleaning based on the result of the sub step (d3), and wherein the third plasma excitation system has an excitation antenna portion and a tip portion of the excitation antenna portion is inserted into the wafer processing chamber or the vacuum pumping system.