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