Process Hierarchy

  Undoped amorphous silicon LPCVD
Process characteristics:
Amount of material added to a wafer
Amount of material added to a wafer, must be 0 .. 2 µm
0 .. 2 µm
Deposition rate
Rate at which material is added to a wafer
35 .. 50 Å/min
Excluded materials gold, Borofloat (Schott), Pyrex (Corning 7740)
Material amorphous silicon
Pressure of process chamber during processing
300 mTorr
Sides processed both
Temperature 580 °C
Wafer size
Wafer size
Equipment Tylan/Tystar Furnaces (undoped polysilicon tube)
Equipment characteristics:
Batch sizes 100 mm: 24, 150 mm: 9
Wafer geometry
Types of wafers this equipment can accept
1-flat, 2-flat
Wafer holder
Device that holds the wafers during processing.
fused silica boat
Wafer materials
List of wafer materials this tool can accept (not list of all materials, just the wafer itself).
Wafer thickness
List or range of wafer thicknesses the tool can accept
300 .. 1500 µm
  • Glass wafers are NOT allowed!