Patent ID: 8888947

Claim:
A control system, comprising: one or more etch tools configured to etch a first and a second substrate in a first and a second etch atmosphere each comprising at least one gaseous component to form features on said first and second substrates, wherein at least one of said features is a via formed in a dielectric layer to expose an underlying metal region; at least one metrology unit configured to measure electrical data representative of a characteristic of the features formed on the substrates, wherein at least one of said features is the via; a control section that is operatively connected to said etch tools and said at least one metrology unit, the control section being configured to: determine at least one flow rate of a supply of said at least one gaseous component to said one or more etch tools configured to etch the first substrate to form a first via in a first dielectric layer to expose a first metal region on said first substrate; receive, from said at least one metrology unit, feedback information indicative of the measured electrical data representative of the characteristic of the first via formed on the first substrate; and provide, to said one or more etch tools, signaling indicating a modified value of said at least one flow rate of the supply of said at least one gaseous component for etching the second substrate in the second etch atmosphere to form a second via in a second dielectric layer to expose a second metal region on said second substrate, wherein the modified value is determined based on the feedback information.