One hundred millimeter single crystal silicon carbide wafer
View Patent ↗A method of producing a high quality bulk single crystal of silicon carbide in a seeded growth system is disclosed. The method includes positioning the seed crystal in a crucible while exerting minimal torsional forces on the seed crystal to thereby prevent torsional forces from warping or bowing the seed crystal in a manner that that would otherwise encourage sublimation from the rear of the seed crystal or undesired thermal differences across the seed crystal.
1. In a seeded growth system for producing a high quality bulk single crystal of silicon carbide, the improvement comprising:
a threaded upper portion of the seed holder; and
a threaded upper portion of the susceptor;
for threading the seed holder into the top of the susceptor to hold the seed in the desired position.
2. A sublimation growth system according to claim 1 .
3. A growth system according to claim 1 further comprising a seed crystal of silicon carbide that has a polytype selected from the group consisting of the 3C, 4H, 6H, and 15R polytypes.
4. In a seeded growth system for producing a high quality bulk single crystal of silicon carbide, the improvement comprising mounting the seed crystal in an edge ring seed cap and positioning the edge ring seed cap in the seed holder to thereby minimize the mechanical forces applied to the seed crystal to in turn minimize or eliminate any distortion in the seed crystal resulting from its mounting on the seed holder.
5. A growth system according to claim 4 further comprising a seed crystal of silicon carbide that has a polytype selected from the group consisting of the 3C, 4H, 6H, and 15R polytypes.
6. A sublimation growth system according to claim 4 .