Description: The term “Test Wafer” has become a catch all for many different types of wafers. Test wafers can be wafers that fell out of one or more specifications at the factory in the attempt to make Prime wafers and are now test.
These wafers work fine as test, but remember test wafers have no flatness spec and the resistivity range they are normally sold under is 0-100 Ohm/cm (a very wide range). As long as your wafer vendor will guarantee they will meet SEMI Specifications for test wafers everything should be fine, for most development and testing purposes.
Uses For Test Wafers: Test wafers are acceptable for a wide range of uses when low cost material is needed for testing equipment running marathons and other uses where large numbers of wafers are needed. Films normally deposit well on test wafers.
Even if you are doing very high end R&D work it is much more cost effective to develop a process using test wafers and then do the final checks using Prime or Epi-Prime wafers.
See inventory purchase list for availability.