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To: pompsander who wrote (5304)	4/16/2001 2:35:00 PM
From: Jdaasoc	Read Replies (1) \| Respond to of 10714

Can anyone explain to me the difference between an n-type 6H and an n-type 4H wafer? Could it be that the 3" 4H wafers are the SiC precursors of the RF power devices that Spectrain is required to purchase. AKA to the SIC gemstone material C&C was required to purchase. As you can see I am slightly skeptical of the whole situation. john

To: pompsander who wrote (5304)	4/16/2001 6:31:19 PM
From: John Walliker	Read Replies (1) \| Respond to of 10714

Pompsander, 4H and 6H are two different crystalline structures. In each case the atoms are arranged in an hexagonal structure, where the number relates to the number of crystalline layers before the structure repeats itself. If each distinct layer of atoms is represented by a letter, with the same letter re-used if another layer has exactly the same arrangement of atoms, then the stacking sequences are as follows: 4H 6H ABAC ABCACB The physical and electrical properties of the two types are slightly different (there are other structures (15R, 21R as well), but Cree don't make them). John