Growth and characterization of the isotopically enriched Si-28 bulk singlecrystal

We report on the successful growth of an isotopically enriched Si-28 bulk s ingle crystal of the size similar to 4 mm in diameter and similar to 50 mm in length. The isotopic enrichement of Si-28 (99.924 at%), Si-29 (0.073 at% ), and Si-30 (0.003 at%) has been determined by secondary-ion-mass spectros copy (SIMS). The crystal is entirely p-type with the room temperature free- hole concentration similar to 5 x 10(17) cm(-3). The majority impurity is f ound to be aluminum which can be removed easily in the future zone purifica tion process.