| | on front   Silicon nitride PECVD | 
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              | Process characteristics: | 
            | Thickness Amount of material added to a wafer |  | 
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            | Ambient Ambient to which substrate is exposed during processing | nitrogen, silane, ammonia | 
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            | Batch size | 12 | 
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            | Deposition rate Rate at which material is added to a wafer | 160 Å/min | 
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            | Material | silicon nitride | 
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            | Microstructure | amorphous | 
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            | Refractive index | 1.985 | 
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            | Residual stress | 600 MPa | 
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            | Sides processed | either | 
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            | Temperature | 350 °C | 
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            | Uniformity | -0.07 .. 0.07 | 
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            | Wafer size |  | 
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            | Equipment | Custom PECVD | 
            
            
              | Equipment characteristics: | 
            | MOS clean | no | 
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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). | fused silica, Borofloat (Schott), indium phosphide, silicon, gallium arsenide, silicon on insulator | 
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            | Wafer thickness List or range of wafer thicknesses the tool can accept | 100 .. 2000 µm | 
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