Patent ID: 7741583

Claim:
A method of processing a wafer comprising: positioning a wafer on a bake plate in a processing module ( 930 ); lowering a bake plate cover assembly ( 910 ) having a bake plate cover ( 911 ) over the wafer during a baking process; raising the bake plate cover assembly ( 910 ) after the baking process; removing the wafer from the bake plate; determining a first processing state for the bake plate cover assembly ( 910 ) and either processing another wafer if the first processing state is a first value or establishing a cleaning process for the bake plate cover assembly ( 910 ) if the first processing state is a second value, wherein the establishing the cleaning process comprises: moving the bake plate cover assembly ( 910 ) to a cleaning module ( 940 ) having a nozzle assembly ( 950 ) therein, positioning the nozzle assembly ( 950 ) at a first cleaning position within the bake plate cover ( 911 ); rotating the nozzle assembly ( 950 ) at a first cleaning speed within the bake plate cover ( 911 ) while spraying a first solvent solution on an inner surface ( 915 ) of the bake plate cover ( 911 ); and rotating the nozzle assembly ( 950 ) at a first drying speed within the bake plate cover ( 911 ) while spraying on the inner surface ( 915 ) of the bake plate cover ( 911 ) a first drying gas that comprises nitrogen (N 2 ); and determining a second processing state for the bake plate cover ( 911 ) and either moving the bake plate cover assembly ( 910 ) to the processing module ( 930 ) if the second processing state is a first value or re-cleaning the bake plate cover ( 911 ) if the second processing state is a second value.