INGOT GROWING APPARATUS

An ingot growing apparatus is disclosed. An ingot growing apparatus according to an aspect of the present invention comprises a growth furnace for growing an ingot, and a main crucible which is accommodated in the growth furnace and accommodates molten silicon, wherein the main crucible comprises: a main crucible bottom portion; a main crucible side portion that extends upwardly from the main crucible bottom portion; and a main crucible inclined portion that has an inclined surface extending upward and outward from the main crucible side portion. In addition, when the molten silicon is supplied from the upper side of the main crucible side portion into the main crucible, the molten silicon is guided into the main crucible along the inclined surface, thereby preventing the molten silicon from splashing around the main crucible.

TECHNICAL FIELD

The present invention relates to an apparatus for growing an ingot.

BACKGROUND ART

Single crystal silicon is used as a basic material for most semiconductor components, and this material is manufactured as single crystals with high purity, and one of the manufacturing methods thereof is the Czochralski method.

In the Czochralski crystallization method, silicon is placed into a crucible, and the crucible is heated to melt the silicon. In addition, when a single crystal seed is pulled upward while rotating in a state of being in contact with the molten silicon, an ingot having a predetermined diameter is grown.

The continuous Czochralski method (CCz), which is one of the Czochralski methods, is a method of continuously growing an ingot while supplementing the consumed molten silicon by continuously injecting solid polysilicon or molten silicon into the crucible.

While solid polysilicon is injected into the crucible, a phenomenon occurs in which molten silicon is splashed. In addition, when the molten silicon is splashed, a wave is generated in the molten silicon, and there is a problem in that the single crystal yield of an ingot is lowered.

Further, in the process of injecting solid polysilicon into the crucible, a sudden temperature change of the molten silicon occurs. Such a temperature change is a factor that reduces the single crystal yield of an ingot.

DISCLOSURE

Technical Problem

According to an aspect of the present invention, in the process of supplying a solid silicon material to a crucible, the present invention is directed to providing an apparatus for growing an ingot that prevents a sudden change in temperature of the molten silicon inside the crucible while preventing wave generation in the molten silicon inside the crucible.

Technical Solution

The apparatus for growing an ingot according to an aspect of the present invention may include a growth furnace for growing an ingot; and a main crucible which is accommodated in the growth furnace and accommodates molten silicon, wherein the main crucible includes a main crucible bottom portion; a main crucible side portion which extends upwardly from the main crucible bottom portion; and a main crucible inclined portion that has an inclined surface extending upward and outward from the main crucible side portion, and wherein when the molten silicon is supplied from the upper side of the main crucible side portion into the main crucible, the molten silicon is guided into the main crucible along the inclined surface.

In this case, the inclined surface may be formed such that the slope of the inclined surface is the same from the inside to the outside of the main crucible, or the slope becomes small from the inside to the outside.

In this case, the main crucible side portion may be formed perpendicularly or inclined outward from the main crucible bottom portion.

In this case, a connecting portion where the inclined surface is connected to the main crucible side portion may be formed as a curved surface.

In this case, the main crucible inclined portion may include a guide groove which is formed on the inclined surface and guides the molten silicon supplied onto the inclined surface.

In this case, the guide groove may be formed in plurality on the inclined surface along the circumferential direction of the main crucible.

In this case, the guide groove may be formed in a spiral which is curved from the inside to the outside on the inclined surface.

In this case, the apparatus for growing an ingot may further include a susceptor which is formed to surround the outer surfaces of the main crucible bottom portion, the main crucible side portion and the main crucible inclined portion; and a heater which is located outside the susceptor to heat the main crucible by heating the susceptor.

In this case, the apparatus for growing an ingot may further include a preliminary crucible for melting a solid silicon material to produce the molten silicon and supplying the molten silicon to the main crucible, wherein the preliminary crucible includes a melting part in which the solid silicon material is melted; and a protrusion part which is provided with a guide surface which extends from the melting part in a direction of the main crucible to guide the molten silicon in a direction of the main crucible such that the silicon melted from the melting part can be supplied into the main crucible along the inclined surface of the main crucible, and wherein the preliminary crucible is movable so as to be located at a first position in which the solid silicon material is melted and at a second position in which the molten silicon is supplied to the main crucible.

In this case, in the first position, the guide surface may be formed to be inclined in the upper direction of the main crucible.

In this case, in the second position, the angle between the guide surface and the main crucible bottom portion may be smaller than the angle between the inclined surface and the main crucible bottom portion.

In this case, in the second position, the end of the protrusion part may be positioned adjacent to the inclined surface, and in the first position, the end of the protrusion part may be positioned farther from the inclined surface than in the second position.

Advantageous Effects

According to the above configuration, in the apparatus for growing an ingot according to an aspect of the present invention, when molten silicon is supplied into the main crucible, the molten silicon is guided into the main crucible along the inclined surface, thereby preventing the molten silicon from splashing around the main crucible.

Further, in the apparatus for growing an ingot according to an aspect of the present invention, since the molten silicon is not directly supplied to the main crucible but is supplied to the main crucible through an inclined surface, wave generation in the molten silicon inside the crucible is prevented, and a rapid temperature change of the molten silicon in the main crucible is prevented.

Further, in the apparatus for growing an ingot according to an aspect of the present invention, since the rapid temperature change of the molten silicon inside the main crucible is prevented while preventing the wave generation in the molten silicon inside the crucible inside the main crucible, it prevents the lowering of the single crystal yield of an ingot.

MODES OF THE INVENTION

Terms and words used in the present specification and claims should not be construed as limited to their usual or dictionary definition, and they should be interpreted as a meaning and concept consistent with the technical idea of the present invention based on the principle that inventors may appropriately define the terms and concept in order to describe their own invention in the best way.

Accordingly, the exemplary embodiments described in the present specification and the configurations shown in the drawings correspond to preferred exemplary embodiments of the present invention, and do not represent all the technical spirit of the present invention, and thus, the configurations may have various examples of equivalent and modification that can replace them at the time of filing the present invention.

It is understood that the terms “include” or “have”, when used in the present specification, are intended to describe the presence of stated features, integers, steps, operations, elements, components and/or a combination thereof but do not preclude the possibility of the presence or addition of one or more other features, integers, steps, operations, elements, components or a combination thereof.

The presence of an element in/on “front”, “rear”, “upper or above or top” or “lower or below or bottom” of another element includes not only being disposed in/on “front”, “rear”, “upper or above or top” or “lower or below or bottom” directly in contact with other elements, but also cases in which another element being disposed in the middle, unless otherwise specified. In addition, unless otherwise specified, that an element is “connected” to another element includes not only direct connection to each other but also indirect connection to each other.

Hereinafter, the apparatus for growing an ingot according to an exemplary embodiment of the present invention will be described with reference to the drawings. In the present specification, in terms of describing the apparatus for growing an ingot according to an exemplary embodiment of the present invention, the configurations that are not related to the contents of the present invention are not illustrated in detail or omitted for the sake of simplification of the drawings, and the apparatus for growing an ingot according to the present invention will be described by mainly focusing on the contents that are related to the spirit of the invention.

In the present specification, the arrow direction of the Z-axis is referred to as the upper side. The lower side means the opposite direction to the upper side.

FIG.1is a view schematically showing the apparatus for growing an ingot according to an exemplary embodiment of the present invention.

Referring toFIG.1, the apparatus for growing an ingot100according to an exemplary embodiment of the present invention includes a growth furnace110, a main crucible120, a susceptor130and a preliminary melting part170.

The growth furnace110has an internal space110awhich is maintained in a vacuum state, and is formed such that an ingot I is grown in the internal space110a. The main crucible120to be described below is disposed in the inner space110a.

The growth furnace110is provided with a vacuum pump (not illustrated) and an inert gas supply part (not illustrated). The vacuum pump may maintain the internal space110ain a vacuum atmosphere. In addition, the inert gas supply part supplies inert gas to the inner space110a. The inert gas may be, for example, argon (Ar).

The main crucible120is accommodated in the inner space110aof the growth furnace110. The main crucible120may accommodate molten silicon M. The main crucible120is generally formed in the shape of a reverse dome. In addition, the main crucible120is not limited to being formed in the shape of a reverse dome, and may be formed in various shapes such as a cylindrical shape.

In addition, the main crucible120is made of a quartz material. However, the main crucible120is not limited to being made of a quartz material, and may include various materials that have heat resistance at a temperature of about 1,400° C. or higher and withstand a sudden change in temperature.

In addition, while a single crystal seed S is in contact with the molten silicon M accommodated in the main crucible120, when a wire W connected to the upper side of the growth furnace110pulls up the single crystal seed S in the upward direction, the ingot I having a predetermined diameter is grown.

In addition, the inside of the main crucible120is divided into a first region21in which the ingot I is grown and a second region22which surrounds the first region21. In the first region21, the temperature for growing the ingot I may be appropriately controlled. The main crucible120will be described in detail below with reference to the drawings.

The susceptor130surrounds the outer surface of the main crucible120. The susceptor130supports the main crucible120. The inner surface of the susceptor130has a shape corresponding to the outer surface of the main crucible120. For example, if the main crucible120has a reverse dome shape, the susceptor130also has a reverse dome shape. The susceptor130is made of a graphite material. In addition, the susceptor130is not limited to being made of a graphite material, and may include various materials having strong heat resistance and conductor properties.

Accordingly, even if the main crucible120is made of a quartz material and deformed at a high temperature, the susceptor130surrounds and supports the main crucible120so as to maintain a state in which the main crucible120accommodates the molten silicon M. In addition, the main crucible120which is made of the quartz material blocks a contact between the molten silicon M and the susceptor130which is made of the graphite material such that that the graphite is prevented from becoming an impurity of the molten silicon M.

In addition, a susceptor support part150for supporting the susceptor130is disposed below the growth furnace110. The upper end of the susceptor support part150has a shape corresponding to the lower end of the susceptor130. In addition, while the susceptor support part150supports the susceptor130at the lower side of the growth furnace110, the susceptor support part150rotates in the same direction as the susceptor130. Accordingly, while the main crucible120accommodates the molten silicon M, the main crucible120is rotated in the same direction as the susceptor130.

In addition, the growth furnace110is provided with a driving part (not illustrated) that provides a rotational force to rotate the susceptor support part150. The susceptor support part150is rotatably connected to the driving part. When the driving part receives power and provides a rotational force to the susceptor support unit150, the main crucible120is rotated in the same direction as the susceptor130.

In addition, a heater140for heating the susceptor130is provided in the growth furnace110. The heater140is formed to surround the outer surface of the susceptor130. The heater140may heat the susceptor130in a resistance heating method. In addition, the heater140may heat the susceptor130by electromagnetic induction, which is an induction heating method. When the heater140is operated by an induction heating method, the heater140is disposed to be spaced apart from the outer surface of the susceptor130such that the heat of the susceptor130is prevented from being transferred back to the heater140.

In addition, a heater support part141for supporting the heater140is disposed below the growth furnace110. The heater support part141is generally formed in a cylindrical shape. The susceptor support part150is disposed inside the heater support part141having the cylindrical shape. In addition, the upper end of the heater support part141has a shape corresponding to the lower end of the heater140, and the heater140is disposed on the upper end of the heater support part141.

The preliminary melting part170is disposed on one side of the growth furnace110. A heating space170ais formed in the preliminary melting part170. In addition, a solid silicon material is melted in the heating space170a. The preliminary melting part170includes a preliminary crucible180, a preliminary crucible heater191and the preliminary crucible moving module185.

The preliminary crucible180is disposed in the heating space170a. The preliminary crucible180is supplied with a solid silicon material. In addition, the preliminary crucible180melts the solid silicon material, and accommodates the molten silicon M. The preliminary crucible180is made of a quartz material. In addition, a second susceptor (not illustrated) is disposed on the outer surface of the preliminary crucible180. The second susceptor supports the preliminary crucible180. The second susceptor is made of a graphite material.

The preliminary crucible heater191heats the second susceptor. The preliminary crucible heater191may be a coil. The coil may be made of a copper material, and may include various materials having good electrical conductivity. The preliminary crucible heater191may heat the second susceptor in a resistance heating method. In addition, the preliminary crucible heater191may heat the second susceptor by electromagnetic induction, which is an induction heating method. When the second susceptor is heated, the heat of the second susceptor is thermally conducted to the preliminary crucible180. In addition, the preliminary crucible heater191is surrounded by a shield190. When the preliminary crucible heater191is operated by an induction heating method, the shield190is made of a ceramic material. The shield190prevents the preliminary crucible heater191which is made of a coil from being exposed to the inner space110aof the growth furnace110, thereby preventing an arc discharge from occurring in a vacuum atmosphere.

In addition, the preliminary crucible180is inclined to one side to supply the molten silicon to the main crucible120.

In an exemplary embodiment of the present invention, the side facing the main crucible120in the preliminary melting part170is referred to as one side, and the opposite side is referred to as the other side.

The position of the preliminary crucible180is controlled to any one position of a first position in which the solid silicon material is accommodated and melts the accommodated solid silicon material, and a second position which is inclined such that the molten silicon M is supplied to the main crucible120. That is, the first position means a position of the preliminary crucible180which is located such that the molten silicon M accommodated in the preliminary crucible180does not overflow or flow to the outside of the preliminary crucible180, and the second position means a position of the preliminary crucible180which is located such that the molten silicon M accommodated in the preliminary crucible180is supplied to the main crucible120. Herein, the position is not only the horizontal (X-axis) and vertical (Z-axis) positions of the preliminary crucible180, but also may mean to include an angle between the preliminary crucible180and the main crucible bottom portion121.

To this end, the preliminary melting part170is provided with a preliminary crucible moving module185for moving the position of the preliminary crucible180.

The preliminary crucible moving module185tilts one side of the preliminary crucible180toward the main crucible120, and the molten silicon M accommodated in the preliminary crucible180is supplied to the main crucible120. Accordingly, when the preliminary crucible180is inclined to the second position, the molten silicon M in the preliminary crucible180falls to the main crucible120through one side of the preliminary crucible180.

In addition, the growth furnace110is provided with a quantitative supply part (not illustrated) for supplying a solid silicon raw material to the main crucible120. The quantitative supply part (not illustrated) receives the solid silicon raw material from the material supply part (not illustrated) and supplies the same to the preliminary melting part170.

FIG.2ais a perspective view showing a main crucible of the apparatus for growing an ingot according to an exemplary embodiment of the present invention,FIG.2bis a cross-sectional view showing a main crucible of the apparatus for growing an ingot according to an exemplary embodiment of the present invention, andFIG.3is a view showing the main configuration adjacent to the inclined surface of the main crucible of the apparatus for growing an ingot according to an exemplary embodiment of the present invention.

Referring toFIGS.2a,2band3, the main crucible120includes a main crucible bottom portion121, a main crucible side portion122and a main crucible inclined portion123.

The main crucible bottom portion121is formed in a rounded shape.

The main crucible side portion122extends upwardly from the main crucible bottom portion121. In addition, the main crucible side portion122is perpendicular from the main crucible bottom portion121. In addition, according to various exemplary embodiments of the present invention, the main crucible side portion122may be formed to be inclined in an outward direction of the main crucible120.

The main crucible inclined portion123is provided with an inclined surface123awhich extends upward from the main crucible side portion122and outwardly of the main crucible120.

In an exemplary embodiment of the present invention, as illustrated inFIG.3, the inclined surface123ais formed such that the slope of the inclined surface is the same from the inside to the outside of the main crucible120. As another example, the inclined surface123amay be formed such that the slope of the inclined surface decreases from the inner side to the outer side of the main crucible120.

Meanwhile, in the present specification, when the main crucible bottom portion121is formed in a rounded shape, a surface which is parallel to the X axis in the main crucible bottom portion121is defined as a main crucible bottom portion121which becomes a reference of angles. In addition, for the convenience of description, the angle α of the inclined surface is illustrated based on a first virtual line L1which is parallel to the main crucible bottom portion121.

In an exemplary embodiment of the present invention, a connection portion123cwhere the inclined surface123ais connected to the main crucible side portion122, that is, the corner portion is formed as a curved surface. Accordingly, when the molten silicon M flows down along the inclined surface123a, the splashing is prevented even while it passes through the connecting portion123c.

In an exemplary embodiment of the present invention, the total height HT of the main crucible120is the sum of a height H1of the main crucible bottom portion121, a height H2of the main crucible side portion122and a height H3of the crucible inclined portion123. For example, when the slope of the main crucible inclined portion123is 45°, the thickness of the susceptor130(refer toFIG.1) is the same as the height H3of the main crucible inclined portion123. In addition, the thickness of the susceptor130(refer toFIG.1) may be less than 25 mm. In addition, the total height HT of the main crucible120may be approximately 132 mm. In this case, the height H3of the main crucible inclined portion123may be within about 20% of the total height HT of the main crucible120.

The main crucible120according to an exemplary embodiment of the present invention may be formed in a shape that is not high in height compared to the width of the main crucible120, and when it is poured into the inclined portion123in order to allow molten silicon to flow into the main crucible120, the inclined portion123of the main crucible120is preferably formed to have a certain extension length in order to flow down along the inclined portion123and stably flow into the main crucible120through the main crucible side portion. As such, since the inclined portion123of the main crucible120has a certain extension length, even if the molten silicon M is poured into an inclined surface while the main crucible120is rotated, it is prevented from splashing around the main crucible120.

Meanwhile, the susceptor130is formed to surround the outer surfaces of the main crucible bottom portion121, the main crucible side portion122and the main crucible inclined portion123. In addition, the upper end of the susceptor130is formed to be inclined to support the main crucible inclined portion123. Accordingly, the main crucible inclined portion123may be heated by the susceptor130. For example, the cross-section of the upper end of the susceptor130may be approximately formed in an inverted triangle.

In addition, the upper end surface131of the susceptor130is formed to be inclined at a second angle β which is formed with the main crucible bottom portion121. Herein, the second angle β is illustrated based on a second virtual line L2which is parallel to the main crucible bottom portion121. In addition, when the second angle β is the same as the angle α, the upper end surface131of the susceptor130stably supports the main crucible inclined portion123if the main crucible inclined portion123is deformed by high temperature.

In addition, the length T3of the inclined surface123ais longer than the sum (T1+T2) of the thickness T1of the main crucible120and the thickness T2of the susceptor130. Accordingly, the molten silicon M is prevented from moving to the susceptor130away from the inclined surface123a.

In addition, the preliminary crucible180includes a melting part181in which the solid silicon material is melted, and a protrusion part182which extends from the melting part in the direction of the main crucible such that the molten silicon is supplied from the melting part181along the inclined surface123aof the main crucible120to the inside of the main crucible120.

The protrusion part182is provided with a guide surface182afor guiding the molten silicon in the direction of the main crucible120.

In an exemplary embodiment of the present invention, the preliminary crucible180is moved so as to be located at a first position in which the solid silicon material is melted, and at a second position in a state for supplying the molten silicon to the main crucible120.

In the first position, as illustrated inFIG.1, the guide surface182ais formed inclined in the upper direction of the main crucible120. In addition, the angle θ1between the guide surface182aand the main crucible bottom portion121at the first position corresponds to an acute angle range. For example, the angle θ1between the guide surface182aand the main crucible bottom portion121at the first position may be approximately 7°.

Further, in the second position, the angle θ2between the guide surface182aand the main crucible bottom portion121is equal to or greater than 0°. Herein, the angle θ2between the guide surface182aand the main crucible bottom portion121is illustrated based on a third virtual line L3which is parallel to the main crucible bottom portion121. If the angle θ2between the guide surface182aand the main crucible bottom portion121in the second position is too large, the molten silicon M is rapidly poured toward the main crucible, and thus, there is an increased possibility of splashing around while pouring. Therefore, by adjusting the angle θ2between the guide surface182aand the main crucible bottom portion121to control the speed at which the molten silicon M is poured, the molten silicon M is prevented from splashing while being poured toward the main crucible.

In this case, in an exemplary embodiment of the present invention, the angle θ2between the guide surface182aand the main crucible bottom portion121at the second position is smaller than the angle between the inclined surface123aand the main crucible bottom portion121.

Further, in the second position, the end of the protrusion part182is positioned to be adjacent to the inclined surface123a, and in the first position, the end of the protrusion part182is positioned farther from the inclined surface123acompared to the second position.

Accordingly, when the molten silicon M accommodated in the preliminary crucible180falls toward the inclined surface123awhile the end of the protrusion part182is positioned to be adjacent to the inclined surface123a, the molten silicon M falls in an acute angle range with respect to the inclined surface123asuch that the molten silicon M is prevented from colliding with the inclined surface123aand splashing.

As such, according to an exemplary embodiment of the present invention, since the molten silicon M of the preliminary crucible180is supplied to the inside of the main crucible120via the inclined surface123a, the molten silicon M of the preliminary crucible180is not directly supplied to the main crucible120, thereby preventing the splashing of the molten silicon M into the main crucible120.

In addition, since the molten silicon M of the preliminary crucible180is supplied to the main crucible120at a maximum distance from the first region21, a sudden change in temperature of the first region21is prevented by supplying the molten silicon M of the preliminary crucible180.

In addition, referring toFIG.3, the upper end123bof the main crucible inclined portion123is disposed between a virtual line L4and rotation radii C1, C2of the preliminary crucible180. Herein, the virtual line L4is a line extending from the end of the protrusion part182in the Z-axis direction. Accordingly, as the upper end123bof the main crucible inclined portion123is disposed between the virtual line L4and the rotation radii C1, C2of the preliminary crucible180, the molten silicon M is prevented from leaking out of the main crucible120in the process of supplying molten silicon from the preliminary crucible180to the inclined surface123a.

FIG.4is a view showing a main crucible of the apparatus for growing an ingot according to another exemplary embodiment of the present invention.

Referring toFIG.4, the main crucible220of the apparatus for growing an ingot according to another exemplary embodiment of the present invention has a substantially conical shape. For example, the bottom221of the main crucible220is formed to protrude. In addition, the inclined surface220aof the main crucible220is formed to have a constant angle a1which is formed with the upper direction of the bottom221.

In this way, the main crucible220of the apparatus for growing an ingot according to another exemplary embodiment of the present invention has a wider inclined surface220athan that in the exemplary embodiment of the present invention, so as to be stably supplied with the silicon molten product of the preliminary crucible180(refer toFIG.3).

FIG.5is a view showing a main crucible of the apparatus for growing an ingot according to another exemplary embodiment of the present invention.

Referring toFIG.5, the main crucible320of the apparatus for growing an ingot according to another exemplary embodiment of the present invention is formed with an inclined surface320ahaving a rounded shape.

Accordingly, when the water level of the molten silicon (M) accommodated in the main crucible320is lowered, it has a wider inclined surface320athan that in the embodiment of the present invention, so as to be stably supplied with the silicon molten product of the preliminary crucible180(refer toFIG.3).

FIG.6is a view showing a main crucible of the apparatus for growing an ingot according to another exemplary embodiment of the present invention.

Referring toFIG.6, the main crucible420of the apparatus for growing an ingot according to another exemplary embodiment of the present invention has a substantially cylindrical shape. The main crucible420includes a bottom portion421, a side portion422and a protruding guide portion423.

The bottom portion421has a rounded shape.

The side portion422extends upwardly from the bottom portion421.

The inner surface422aof the side portion422may be in contact with the molten silicon M.

The protruding guide portion423is formed to protrude from the upper end of the side portion422in the inner direction of the main crucible420. The side surface423aof the protruding guide portion423has an inwardly rounded shape.

The main crucible420has a substantially cylindrical shape, and is formed to have a larger volume for accommodating the molten silicon (M) compared to the main crucibles having other shapes. Accordingly, the main crucible420accommodates the molten silicon (M) having a higher water level than the main crucible of the above-described exemplary embodiment.

In addition, after the molten silicon M accommodated in the preliminary crucible180(refer toFIG.3) falls on the upper surface423bof the protruding guide portion423, it flows down along the side surface423aof the protruding guide portion423. Accordingly, the molten silicon (M) is prevented from splashing into the inner side of the main crucible420.

FIG.7is a perspective view showing a main crucible of the apparatus for growing an ingot according to another exemplary embodiment of the present invention, andFIG.8is a view of the main crucible ofFIG.7viewed from the upper side of the main crucible.

Referring toFIGS.7and8, the main crucible520of the apparatus for growing an ingot according to another exemplary embodiment of the present invention includes a main crucible bottom521, a main crucible side portion522and a main crucible inclined portion523, and when the components of another exemplary embodiment of the present invention are the same as or similar to those of the exemplary embodiment of the present invention, the above descriptions will be substituted.

The main crucible inclined portion523is provided with a guide groove525which is formed on the inclined surface523ato guide the molten silicon supplied onto the inclined surface523a.

A plurality of guide grooves525are formed on the inclined surface523aalong the circumferential direction of the main crucible520. In addition, the guide groove525is formed in a spiral shape which is bent from the inside to the outside on the inclined surface523a.

In addition, when the main crucible520rotates in a counterclockwise direction C2, the molten silicon which is accommodated in the main crucible520is also rotated in the counterclockwise direction C2. That is, the molten silicon is moved in the counterclockwise direction C2in a region which is adjacent to the main crucible inclined portion523.

In this case, the molten silicon of the preliminary crucible180(refer toFIG.3) moves along the guide groove525, and is not directly supplied to the first region21of the main crucible520, but it is supplied to the second region22rotating in the counterclockwise direction C2. That is, the guide groove525prevents the molten silicon from being directly supplied to the first region21, thereby improving the yield of single crystals of the ingot from being lowered. In this case, the width of the guide grooves525, the number, depth and degree of bending of the guide grooves525may be designed in various ways in order to prevent splashing of the poured molten silicon. In addition, although the present exemplary embodiment is exemplified so that the guide groove525is used to guide the molten silicon, it may be also possible that a guide protrusion rather than a guide groove is formed in the inclined portion.

Although the exemplary embodiments of the present invention have been described, the spirit of the present invention is not limited by the exemplary embodiments presented herein, and a person skilled in the art who understands the spirit of the present invention may easily suggest other exemplary embodiments by modifying, changing, deleting or adding components within the scope of the same spirit, but this will also be within the spirit of the present invention.