Patent ID: 8216369
Filing Date: 2012-07-10
Classification: C30B,Y10T

Abstract:
1. A physical vapor transport growth system comprising, in combination: a growth chamber charged with source material and a seed crystal in spaced relation; a first porous capsule having in addition to the pores thereof at least one calibrated capillary of predetermined dimensions extending between an interior thereof and an exterior thereof, wherein an interior of the first capsule is charged with a first dopant, each calibrated capillary is sized for controlled effusion of dopant at a temperature between 1900° C. and 2400° C., and an exterior of the first capsule is positioned on or in the source material in the growth chamber; and at least one heating element operative for heating the interior of the charged growth chamber and the first capsule positioned therein to a desired reaction temperature whereupon the source material forms a crystal on the seed crystal and the formed crystal is doped with the first dopant via controlled effusion of the first dopant through the calibrated capillary in the first capsule.