| |   Ellipsometric Film Thickness Measurement | 
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        | Film thickness | 0.01 .. 2 µm | 
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            | Materials | silicon nitride on silicon, silicon dioxide on silicon | 
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            | Refractive index | 1 .. 4 | 
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            | Wafer size |  | 
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            | Equipment | Rudolph ellipsometer | 
            
            
              | Equipment characteristics: | 
            | Batch sizes | 100 .. 150 mm: 1 | 
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            | MOS clean | yes | 
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            | Wafer geometry Types of wafers this equipment can accept | 1-flat, 2-flat, notched, no-flat | 
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            | Wafer materials List of wafer materials this tool can accept (not list of all materials, just the wafer itself). | silicon on insulator, silicon | 
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            | Wafer thickness List or range of wafer thicknesses the tool can accept | 300 .. 900 µm | 
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