Patent ID: 6090718
Filing Date: 2000-07-18
Classification: H01L,Y10S

Abstract:
A method for respectively dry-etching first and second substrates made of silicon, comprising:etching the first substrate within an etching chamber;taking the first substrate out of the etching chamber;disposing a dummy substrate having a surface portion within the etching chamber, the surface portion being made of a material different than silicon;etching a reaction product produced in the step of etching the first substrate;taking the dummy substrate out of the etching chamber;disposing the second substrate within the etching chamber; andetching the second substrate,wherein said etching of the reaction product includes a cleaning step of etching the reaction product, and a seasoning step of removing the reaction product from the etching chamber and adjusting an atmosphere within the etching chamber and a temperature of the dummy substrate,wherein HBr, SiF.sub.4, and O.sub.2 gases are used in the steps of etching the first and second substrates and in the seasoning step, andwherein a total flow rate of the HBr, SiF.sub.4, and O.sub.2 which is introduced into the etching chamber in the seasoning step is smaller than that in the etching steps.