Invention Grant
US08185242B2 Dynamic alignment of wafers using compensation values obtained through a series of wafer movements 有权
使用通过一系列晶片移动获得的补偿值来动态地对准晶片

Dynamic alignment of wafers using compensation values obtained through a series of wafer movements
Abstract:
Methods and systems to optimize wafer placement repeatability in semiconductor manufacturing equipment using a controlled series of wafer movements are provided. In one embodiment, a preliminary station calibration is performed to teach a robot position for each station interfaced to facets of a vacuum transfer module used in semiconductor manufacturing. The method also calibrates the system to obtain compensation parameters that take into account the station where the wafer is to be placed, position of sensors in each facet, and offsets derived from performing extend and retract operations of a robot arm. In another embodiment where the robot includes two arms, the method calibrates the system to compensate for differences derived from using one arm or the other. During manufacturing, the wafers are placed in the different stations using the compensation parameters.
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