Air leakage detecting method for reaction cavity and control method for vacuum reactor

Abstract

Provided are a kind of reaction chamber air-leakage detection method and a vacuum reactor control method, which is to realize a real-time and accurate air-leakage status detection of the reaction chamber in a vacuum reactor and at the same time to assure that the detection step will not affect the yield. The invention provides a new method including: after the standby-processing substrate is processed in a reaction chamber, it is removed and enters into the cleansing process. In the cleansing process, oxygen is fed therein for igniting the plasma, and the spectrum generated by the oxygen-plasma is analyzed through an optical apparatus to see whether the frequency spectrum from nitrogen gas is detected. If the intensity of frequency spectrum from the nitrogen gas is greater than a preset value, the reaction chamber is identified as leakage, thereby stopping the operation of the vacuum reactor; if the spectrum representing the nitrogen gas is not greater than a preset reference value, then proceeding to the next operation step. Through this method, the current fabrication process and equipments can be employed for realizing real-time air-leakage detection and guaranteeing the yield.

Description

technical field [0001] The invention relates to the field of manufacturing semiconductor devices, in particular to a gas leakage detection method for plasma processing equipment. Background technique [0002] Modern semiconductor processing equipment often uses plasma to process substrates. Usually, the reaction chamber in the equipment needs to be evacuated or the reaction gas is introduced under extremely low pressure, and then the substrate composed of semiconductor or other materials is processed. Semiconductor processing equipment includes chemical vapor deposition (CVD), etching, plasma-assisted chemical vapor deposition (PECVD), etc. Precise control of the reaction process needs to be ensured during these treatments, because the introduction of any uncontrollable factors will lead to defects, even major defects, in the processed substrates. Air leakage in the reaction chamber of semiconductor processing equipment is one of the situations that need to be strictly prev...

AI Technical Summary

Problems solved by technology

If the air leak detection is added as an additional step after the processing step, although the above problems can be avoided, the extra time will affect the throughput of the entire processing system

Moreover, air leakage detection needs to be carried out in real time, so if additional detection steps are used, it needs to be carried out frequently after the substrate processing is completed, so that the actual processing time of semiconductor processing equipment will be greatly reduced in order to detect air leakage , reducing the productivity

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