IMPROVED FURNACE APPARATUS FOR CRYSTAL PRODUCTION WITH SEED HOLDER REPOSITIONING UNIT

The present invention refers to a furnace apparatus comprising a furnace unit, wherein the furnace unit comprises a furnace housing with an outer surface and an inner surface, at least one crucible unit, wherein the crucible unit is arranged inside the furnace housing, wherein the crucible unit comprises a crucible housing, wherein the crucible housing has an outer surface and an inner surface, wherein the inner surface at least partially defines a crucible volume, wherein a receiving space for receiving a source material is arranged or formed inside the crucible volume, wherein a seed holder unit for holding a defined seed wafer is arranged inside the crucible volume, wherein the furnace housing inner wall and the crucible housing outer wall define a furnace volume, at least one heating unit for heating the source material, wherein the receiving space for receiving the source material is at least in parts arranged below the seed holder unit, characterized in that a position adjustment unit for adjustment of the position of the seed holder unit during operation of the furnace apparatus is provided, wherein the position adjustment unit is configured to increase the distance between the seed holder unit and the receiving space by moving the seed holder unit away from the receiving space.