NOVELTY - The device comprises a first crucible part extending in a direction of a side part, a second crucible part installed at an inner side of the first crucible part and including a second slope part having an inclination of an acute angle about an upper surface portion of first crucible part, and a casting part including a second cast part that is parallelly extended with a first cast part and combined with the side part of the first crucible part. The casting part includes a casting space between the first cast part and the second cast part to form a silicon substrate.    USE - The device is useful for preparing a silicon substrate (claimed) for a solar cell.    ADVANTAGE - The device prevents the first silicone molten metal from being polluted by graphite, discharges the total amount of silicone molten metal from the quartz crucible part, so that the quartz crucible part can be reused, and has reduced energy consumption.    DETAILED DESCRIPTION - The device comprises a first crucible part extending in a direction of a side part, a second crucible part installed at an inner side of the first crucible part and including a second slope part having an inclination of an acute angle about an upper surface portion of first crucible part, and a casting part including a second cast part that is parallelly extended with a first cast part and combined with the side part of the first crucible part, where the length of the side part of the first crucible part is greater than that of the second crucible part is in opposite directions. The casting part includes a casting space between the first cast part and the second cast part to form a silicon substrate. The device further includes a main chamber kept in an inner portion of the casting space, a dummy bar inserted in an outside of the main chamber, a dummy bar connecting part connecting the dummy bar in a side of the main chamber, a shield for surrounding the crucible part and the casting part along a longitudinal direction, a driver for providing the driving force to the casting part, a gas supply part for supplying the gas to an implantation part, and a source supplying part for supplying the silicon material to the implantation part, where the silicon material and gas are selectively supplied to the implantation part and the dummy bar is made of single crystal material. A first valve controls the opening and closing of a raw material pipe and a material feed part. The gas supply part comprises a gas generating part that provides the space to store the inert gas. A second valve is arranged between the gas generating part and a gas service pipe.