Mono-crystalline silicon growth method

A mono-crystalline silicon growth method includes: providing a furnace, a supporting base and a crucible which do not rotate relative to the furnace, and a heating module disposed at an outer periphery of the supporting base. After solidifying a liquid surface of a silicon melt in the crucible to form a crystal, the heating power of the heating module is successively reduced to appropriately adjust the temperature around the crucible to effectively control a temperature gradient of a thermal field around the crucible, so as to form a mono-crystalline silicon ingot by solidifying the silicon melt.

CROSS-REFERENCE TO RELATED PATENT APPLICATION

This application claims the benefit of priority to Taiwan Patent Application No. 107147827, filed on Dec. 28, 2018. The entire content of the above identified application is incorporated herein by reference.

FIELD OF THE DISCLOSURE

The present disclosure relates to a crystal growth method, and more particularly to a mono-crystalline silicon growth method.

BACKGROUND OF THE DISCLOSURE

A conventional silicon growth apparatus is configured to heat to melt a solid raw material and solidify to crystallize the melted raw material to form a crystal rod. In addition, because the Czochralski Method (i.e., CZ method) is the primary method used in a conventional process to manufacture a crystal rod, conventional mono-crystalline silicon growth methods are also limited thereto. As a result, development in this field has been limited, and still has room for improvement.

SUMMARY OF THE DISCLOSURE

In response to the above-referenced technical inadequacies, the present disclosure provides a mono-crystalline silicon growth method to improve on issues associated with obstacles against development in this field.

In one aspect, the present disclosure provides a mono-crystalline silicon growth method including a preparation step, an initiation step, a shoulder-forming step, a body-forming step, and a tail-forming step. The preparation step is implemented by disposing a silicon melt in a crucible of a mono-crystalline silicon growth apparatus, wherein the mono-crystalline silicon growth apparatus includes a support base supporting the crucible and a heating module disposed at an outer periphery of the support base, and the support base and the crucible do not rotate relative to the heating module. The initiation step is implemented by solidifying a liquid surface of the silicon melt to form a crystal and horizontally growing the crystal toward a side wall of the crucible to increase an outer diameter of the crystal. The shoulder-forming step is implemented by adjusting a thermal field around the crucible when the outer diameter of the crystal reaches at least 90% of a predetermined value so that the outer diameter of the crystal reaches the predetermined value and the crystal is defined as a head crystal, and vertically growing the head crystal toward an inner bottom surface of the crucible. The body-forming step is implemented by reducing a total heat output of the heating module so that the head crystal continuously crystallizes to form a first stage crystal, continuously reducing the total heat output of the heating module so that the first stage crystal continuously crystallizes to form a second stage crystal, and reducing the total heat output of the heating module again so that the second stage crystal continuously crystallizes to form a third stage crystal. The tail-forming step is implemented by reducing the total heat output of the heating module so that the third stage crystal continuously crystallizes to form a tail crystal, and detaching the tail crystal from the crucible to form a mono-crystalline silicon ingot by solidifying the silicon melt.

In one aspect, the present disclosure provides a mono-crystalline silicon growth apparatus including a furnace, a support base disposed in the furnace, a crucible disposed on the support base, and a heating module disposed at an outer periphery of the support base. The support base and the crucible do not rotate relative to the heating module, and an axial direction is defined to be along a central axis of the crucible. The heating module includes a first heating unit, a second heating unit, and a third heating unit. The first heating unit, the second heating unit, and the third heating unit are respectively disposed at positions with different heights corresponding to the axial direction.

Therefore, the mono-crystalline silicon growth method of the present disclosure is provided. The mono-crystalline silicon growth apparatus includes the support base and the crucible which do not rotate relative to the furnace. The heating module can effectively and appropriately adjust a temperature around the crucible to effectively control a directional solidification of a seed crystal and a crystal growth in a crystal growth process of the mono-crystalline silicon ingot so as to improve crystal growth effect. As a result, a quality of the mono-crystalline silicon ingot is improved. Therefore, by using the mono-crystalline silicon growth method, a usage rate of the crystal rod and a production yield are increased.

DETAILED DESCRIPTION OF THE EXEMPLARY EMBODIMENTS

Mono-Crystalline Silicon Growth Apparatus

Referring toFIG. 1toFIG. 3, an embodiment of the present disclosure provides a mono-crystalline silicon growth apparatus100including a furnace1, a support base2disposed in the furnace1, a crucible3disposed on the support base2, a heating module4disposed at an outer periphery of the support base2, and a heat adjusting module5disposed in the furnace1and above the crucible3.

It should be noted that the heat adjusting module5in the present embodiment can cooperate with corresponding components mentioned above, but the connection between the heat adjusting module5and the corresponding components is not limited thereto. That is to say, in other embodiments of the present disclosure, the heat adjusting module5can be used independently or with other components. In addition, the furnace1, the support base2, the crucible3, and the heating module4can further cooperate with a component different from the heat adjusting module5in the present embodiment.

The furnace1includes a furnace wall11which is substantially in a barrel shape and a heat preservation layer14inside of the furnace1. The furnace wall11surroundingly forms an accommodating space12within, and the heat preservation layer14is in the accommodating space12so as to maintain a temperature inside the furnace1so that the quality of a crystal rod in the furnace1in a crystal growth process can be ensured.

In addition, a top side of the furnace1has a valve port13in spatial communication with the accommodating space12so that the accommodating space12can be in spatial communication with the external environment through the valve port13. The furnace1has a mounting groove111which is annular and at an appropriate height inside of the furnace1, and the mounting groove111in the present embodiment is at a top side of the heat preservation layer14, but the present disclosure is not limited thereto.

The support base2is preferably made of a graphite material, but the present embodiment is not limited thereto. The support base2is disposed in the heat preservation layer14of the furnace1, the support base2includes a carrying portion21in a bowl shape and a support portion22in a pillar shape, and a top side of the support portion22is connected to a bottom side of the carrying portion21.

The crucible3can be made of a quartz material, but the present embodiment is not limited thereto. The crucible3is disposed in the heat preservation layer14of the furnace1, and the crucible3is disposed in the carrying portion21of the support base2. In addition, in the present embodiment, an outer surface of the crucible3abuts against an inner surface of the carrying portion21, and a top side of the crucible3slightly extends out of the carrying portion21in the bowl shape, but the present embodiment is not limited thereto. The crucible3has a crucible opening31at the top side of the crucible3, and the crucible opening31faces toward the valve opening13to be filled with a melt liquid for being heated. In the present embodiment, the melt liquid is a silicon melt M.

Therefore, because the crucible3softens and deforms easily under a high temperature, the support base2can provide the crucible3with a sufficient supporting force to prevent the crucible3from tilting. Moreover, the support base2and the crucible3in the present embodiment are limited to not rotate relative to the furnace1. That is to say, any support bases or crucibles rotating relative to the furnace are neither the support base2nor the crucible3in the present embodiment.

It should be noted that the furnace1is defined to have a central axis P, and the valve opening13, the supporting base2, and the crucible3are all mirror-symmetrical relative to the central axis P.

The heating module4is disposed in the heat preservation layer14of the furnace1and is disposed at the outer periphery of the support base2. The heating module4includes a first heating unit41, a second heating unit42, and a third heating unit43. The first heating unit41, the second heating unit42, and the third heating unit43are respectively disposed corresponding to the axial direction and at positions with different heights of the support base2.

In the present embodiment, the first heating unit41surrounds and faces toward an upper half of the crucible3, the second heating unit42surrounds and faces toward a lower half of the crucible3and is disposed under the first heating unit41, the third heating unit43is disposed under the crucible, and a projection area formed by orthogonally projecting the third heating unit43onto the crucible3along the central axis P (or a axial direction of a tube body511mentioned below) falls on an outer bottom surface32of the crucible3, but the present disclosure is not limited thereto. The upper half of the crucible3in the present embodiment refers to a portion extending from the crucible opening31downward to 50% of a depth of the crucible3, and the lower half of the crucible3refers to a portion extending from the inner bottom surface33upward to 50% of the depth of the crucible3, but the present disclosure is not limited thereto.

Moreover, the first heating unit41, the second heating unit42, and the third heating unit43can be designed to be an annular heating device or a plurality of heating devices arranged annularly, but the present disclosure is not limited thereto.

The heat adjusting device5is disposed in the furnace1and above the crucible3. The heat adjusting device5includes a diversion tube51, a plurality of heat preservation sheets52disposed on the diversion tube51, and a hard shaft53passing through the diversion tube51. It should be noted that the in the present embodiment, the hard shaft53cooperates with the diversion tube51and the heat preservation sheets52, but the connection between the hard shaft53and the diversion tube51and the connection between the hard shaft53and the heat preservation sheets52is not limited in the present disclosure. That is to say, in other embodiments of the present disclosure, the hard shaft53can be used independently or with other components.

The diversion tube51includes a tube body511and a carrying body512. The carrying body512is disposed on the mounting groove111of the heat preservation layer14in the furnace1, and the carrying body512is annular and has an inner hole5121. One end (e.g., a top portion5111of the tube body511inFIG. 1) of the tube body511is disposed on the furnace1and extends out of the valve opening13, and the other end (e.g., a bottom portion5112of the tube body511inFIG. 1) of the tube body511is connected to a side wall of the inner hole5121of the carrying body512. Moreover, the carrying body512surrounds the tube body511, and the tube body511and the carrying body512are both above the crucible3.

In addition, the tube body511of the diversion tube51and the carrying body512of the diversion tube51cooperatively define a central axis, and the central axis is preferably substantially overlapping with the central axis P. That is to say, an axial direction of the tube body511is parallel to the central axis P. Therefore, a projection area formed by orthogonally projecting the tube body511onto the crucible3along the axial direction of the tube body511falls on the inner bottom surface33of the crucible3. Moreover, the tube body511is made of a material which does not react with crystal growth gas, which is generally stainless steel, but the present disclosure is not limited thereto.

In the present embodiment, the heat preservation sheets52are preferably in an annular shape and sleeved around the tube body511. That is to say, the heat preservation sheets52are stacked and disposed on the carrying body512and sleeved around the tube body511, but the present disclosure does not limit the shapes of the heat preservation sheets52. Each of the heat preservation sheets52has a thermal radiation reflective rate greater than or equal to 70%. Moreover, the heat preservation sheets52allow only less than 10% of heat at one side of the heat preservation sheets52to pass through the heat preservation sheets52to another side of the heat preservation sheets52.

More specifically, a number of the heat preservation sheets52of the heat adjusting module5is seven, but in other embodiments of the present disclosure, the number of the heat preservation sheets52of the heat adjusting module5is greater than or equal to three. The heat preservation sheets52are made of molybdenum, but the present disclosure is not limited thereto.

Moreover, the heat preservation sheets52have a function of reflecting thermal radiation and can reflect heat into the crucible3. In addition, the bottom portion5112of the tube body511is connected to the inner hole5121of the carrying body512, and the heat preservation sheets52are stacked and disposed on the carrying body512so that the carrying body512and the heat preservation sheets52are outside of the tube body511. The carrying body512is disposed on the mounting groove111so that the tube body511, the carrying body512, and the heat preservation sheets52are disposed above the crucible3, further forming an obstruction above the heat preservation layer14to effectively control the heat dissipating through a top side of the heat preservation layer14.

The hard shaft53is in a strip shape and passes through the tube body511(as shown inFIG. 1andFIG. 2), and the hard shaft53does not rotate relative to the furnace1. A water flow channel531, a gas flow channel533, and a clamping portion532disposed at a bottom side of the hard shaft53are disposed in the hard shaft53.

Both the water flow channel531and the gas flow channel533can be injected with a fluid to take away the heat near the clamping portion532mentioned below. In the present embodiment, the water flow channel531can be injected with flowing water and the gas flow channel533can be injected with flowing gas, but the present disclosure is not limited thereto. In addition, the water flow channel531preferably spirals surroundingly around the gas flow channel533to provide the hard shaft53with a better cooling effect, but the configuration relationship between the water flow channel531and the gas glow channel533is not limited thereto in the present disclosure.

The clamping portion532is disposed at the bottom side of the hard shaft53, and at least a part of the clamping portion532is disposed in the crucible3to clamp a seed crystal6. In the present embodiment, the clamping portion532is adjacent to the water flow channel531and the gas flow channel533so that the fluid injected into the water flow channel531and the gas flow channel533can take away the heat near the clamping portion532.

In addition, the hard shaft53can move back and forth along the axial direction of the tube body511with a pulling speed preferably less than or equal to 50 mm/hr. When the hard shaft53is moving, the clamping portion532thereof is maintained in the crucible3and moves correspondingly. The pulling speed of the hard shaft53can be changed according to the requirements of the crystal growth, and the present disclosure is not limited thereto.

Therefore, the fluid injected into the water flow channel531and the gas flow channel533can take away the heat near the clamping portion532so as to prevent the clamping portion532from being influenced by the heat of the silicon melt M in the crucible3, can control the heat in the crucible3effectively, and can stabilize a heat convection in the crucible3to maintain a degree of flatness of solidification between a crystal7and the silicon melt M.

It should be noted that the gas flow channel533of the hard shaft53in the present embodiment can be omitted. That is to say, in another embodiment of the present disclosure, only the water flow channel531and the clamping portion532at the bottom side of the hard shaft53are disposed in the hard shaft53, and the clamping portion532is adjacent to the water flow channel531so that the fluid injected into the water flow channel531can take away the heat near the clamping portion532.

Referring toFIG. 1toFIG. 3, the mono-crystalline silicon growth apparatus100in the present embodiment takes advantages of the structural design of the heat adjusting module5and the configuration relationship between the heat adjusting module5and other components, (e.g., the heat preservation layer14of the furnace1, the crucible3, and the heating module4). That is to say, the pulling speed and the quality of forming the crystal7can be improved through the addition of the hard shaft53, where the fluid in the water flow channel531and/or the gas flow channel533takes away the heat of surface solidification during the growth of the crystal7and the heat conducting from inside of the silicon melt M to the crystal7. Therefore, a directional solidification and a crystallization process of the seed crystal6melted near the clamping portion532can be effectively controlled so that the seed crystal6can preferably form the crystal7.

According to the above, the first heating unit41, the second heating unit42, and the third heating unit43of the heating module4are disposed at an outer periphery of the crucible3. Therefore, the heating module4can provide appropriate heating in the process of forming a mono-crystalline silicon ingot8to effectively control the growth speed and the growth quality of the mono-crystalline silicon ingot8.

Mono-Crystalline Silicon Growth Method

Referring toFIG. 4toFIG. 5F, the present disclosure further provides a mono-crystalline silicon growth method which can be implemented through the mono-crystalline silicon growth apparatus100, but the present disclosure is not limited thereto. The mono-crystalline silicon growth method in the present disclosure includes a preparation step S110, an initiation step S120, a shoulder-forming step S130, a body-forming step S140, and a tail-forming step S150.

The preparation step S110is implemented by providing the mono-crystalline silicon growth apparatus100mentioned above and disposing the silicon melt M (as shown inFIG. 5A) in the crucible3of the mono-crystalline silicon growth apparatus100. The specific structure of the mono-crystalline silicon growth apparatus100is already described above and will not be reiterated herein. In addition, in other embodiments of the present disclosure, in the mono-crystalline silicon growth apparatus100used for the mono-crystalline silicon growth method, the heat adjusting module5can be replaced by other components.

That is to say, in the preparation step S110, a stacking charge is placed in the crucible3, the crucible3is heated to form a meltdown by the heating module4of the furnace1, and the meltdown forms the silicon melt M after the heating module4appropriately heats the crucible3. The silicon melt M can be formed by an established method, and will not be reiterated herein.

The initiation step S120is implemented by solidifying a liquid surface M1of the silicon melt M to form a crystal7and horizontally growing the crystal7toward a side wall of the crucible3to increase an outer diameter of the crystal7.

That is to say, as shown inFIG. 5AtoFIG. 5C, the seed crystal6is disposed near the clamping portion532of the hard shaft53and contacts with the liquid surface M1of the silicon melt M. A heat output of the heating module4is continuously controlled and enables the liquid surface M1of the silicon melt M to solidify to form a solid-liquid interface M2. The heat near the clamping portion532is taken away by appropriately injecting the fluid into the water flow channel531and/or the gas flow channel533of the hard shaft53, and as a result, the crystal7having the same crystal structure as that of the seed crystal6starts to form on the seed crystal6and the solid-liquid interface M2of the silicon melt M. Moreover, a solidification and crystallization process includes a neck growth process and a crown growth process.

In the neck growth process, a thermal stress generated by the contact between the seed crystal6and the solid-liquid interface M2of the silicon melt M causes dislocations. When a crown starts to grow, the dislocations disappear (as shown inFIG. 5B). In addition, in the neck growth process, the seed crystal6is pulled upward rapidly so that a diameter of the crystal7during forming decreases to 4 to 6 mm. More specifically, in the neck growth process, the dislocations fully disappear through a pulling technique alternating between fast and slow speeds, which is implemented by fast pulling (e.g., with a fast pulling speed within a range of 120 to 200 mm/hr) to decrease a diameter of the neck and slowly pulling (e.g., with a slow pulling speed within a range of 40 to 100 mm/hr) to increase the diameter of the neck. The pulling technique alternating between fast and slow speeds is implemented many times so that the dislocations fully disappear.

In the crown growth process, a pulling speed and a temperature are decreased after the neck is formed so that the diameter of the crystal7is increased gradually to a required size and the crown starts to form (as shown inFIG. 5C). A diameter increasing rate (i.e., an angle of the crown) is the most important factor in this process. If the temperature is decreased too fast, the shape of the crown becomes rectangular because the diameter increases too fast, resulting in the dislocations to occur and therefore losing the crystal structure. Moreover, in the crown growth process, the pulling technique alternating between fast and slow speeds can be used to increase a diameter of the crown with the slow pulling speed (such as within a range of 20 to 40 mm/hr). Meanwhile, because a temperature gradient of a thermal field of the crucible3is small, the heating power of the heating module4should be reduced carefully to effectively control the heat gradient of the thermal field.

It should be noted that in the starting process, the heat output of the first heating unit41is preferably from 80% to 120% of the heat output of the second heating unit42, and the heat output of the second heating unit42is preferably from 80% to 120% of the heat output of the third heating unit43.

The shoulder-forming process is implemented by adjusting the thermal field around the crucible3when the outer diameter of the crystal7reaches at least 90% of a predetermined value so that the outer diameter of the crystal7reaches the predetermined value and the crystal7is defined as a head crystal71, and vertically growing the head crystal71toward an inner bottom33surface of the crucible3. That is to say, in the present embodiment, the crystal7is pulled upward to form the neck and the crown, after a solidification speed between the solid-liquid interface M2of the silicon melt M and the crystal7is stabilized, the crystal will neither be pulled nor grown horizontally, and the head crystal71vertically grows downward only through adjusting the heating module4and controlling a cooling speed of the crucible3.

It should be noted that in the shoulder-forming step S130, the heat output of the first heating unit41is preferably from 150% to 230% of the heat output of the second heating unit42.

As shown inFIG. 5DtoFIG. 5F, the body-forming step S140is implemented by reducing a total heat output of the heating module4so that the head crystal71continuously crystallizes to form a first stage crystal72, continuously reducing the total heat output of the heating module4so that the first stage crystal72continuously crystallizes to form a second stage crystal73, and reducing the total heat output of the heating module4again so that the second stage crystal73continuously crystallizes to form a third stage crystal74.

That is to say, after forming the neck and the crown, a diameter of the head crystal71is maintained at the predetermined value by continuously adjusting the pulling speed and the temperature, and a multi-staged crystal formed by crystallizing for many times as mentioned above is called a crystal body.

According to the body-forming step S140in the present embodiment, the total heat output of the heating module4when forming the first stage crystal72is from 93% to 97% the total heat output of the heating module4in the shoulder-forming process. In addition, when forming the first stage crystal72, the heat output of the first heating unit41is from 170% to 240% of the heat output of the second heating unit42, and the heat output of the second heating unit42is from 180% to 220% of the heat output of the third heating unit43.

According to the body-forming step S140in the present embodiment, the total heat output of the heating module4when forming the second stage crystal73is from 93% to 97% the total heat output of the heating module4when forming the first stage crystal72. In addition, when forming the second stage crystal73, the heat output of the first heating unit41is from 170% to 240% of the heat output of the second heating unit42, and the heat output of the second heating unit42is from 180% to 220% of the heat output of the third heating unit43.

The total heat output of the heating module4when forming the third stage crystal74is from 93% to 97% of the heat output of the heating module4when forming the second stage crystal73. In addition, when forming the third stage crystal74, the heat output of the first heating unit41is from 180% to 260% of the heat output of the second heating unit42, and the heat output of the second heating unit42is from 180% to 220% of the heat output of the third heating unit43.

According to the body-forming step S140in the present embodiment, the heat output of the first heating unit41is higher than the heat output of the second heating unit42, and the heat output of the second heating unit42is higher than the heat output of the third heating unit43. Moreover, each of a volume of the first stage crystal72, a volume of the second stage crystal73, and a volume of the third stage crystal74is from 23% to 32% of a volume of the mono-crystalline silicon ingot8.

It should be noted that in the body-forming step S140of the present embodiment, the mono-crystalline silicon growth apparatus100preferably receives the heat through injecting the fluid into the hard shaft53so that the crystal7grows in the crucible3.

The tail-forming step S150is implemented by reducing the total heat output of the heating module4so that the third stage crystal74continuously crystallizes to form a tail crystal75, and detaching the tail crystal75from the crucible3to form a mono-crystalline silicon ingot8(as shown inFIG. 3) by solidifying the silicon melt M. An outer diameter of the mono-crystalline silicon ingot8is substantially 90% of an inner diameter of the crucible3.

According to the tail-forming step S150in the present embodiment, a sum of a volume of the head crystal71and a volume of the tail crystal75is less than or equal to 30% of the volume of the mono-crystalline silicon ingot8.

According to the tail-forming step S150in the present embodiment, the total heat output of the heating module4when forming the tail crystal75is from 93% to 97% of the total heat output of the heating module4when forming the third stage crystal74. In addition, when forming the tail crystal75, the heat output of the first heating unit41is from 80% to 120% of the heat output of the second heating unit42, and the heat output of the second heating unit42is from 180% to 220% of the heat output of the third heating unit43.

According to the tail-forming step S150in the present embodiment, after detaching the tail crystal75from the crucible3in a crystal solidifying process, an inner stress of the crystal7is reduced as a result of continuously preserving heat, and the mono-crystalline silicon crystal ingot8is therefore formed by solidifying the silicon melt M. The mono-crystalline silicon crystal ingot8is then slowly cooled down and taken out of the furnace1so that the mono-crystalline silicon crystal ingot8has better growth.

It should be noted that, when implementing the mono-crystalline silicon growth method to form the crystal7, the liquid surface M1(or an interface between the crystal7and the silicon melt M) of the silicon melt M is concave because the temperature gradient is small such that a stress when the crystal7grows is small, and the quality of the crystal7is further increased.

Therefore, referring toFIG. 1toFIG. 5F, the mono-crystalline silicon growth apparatus100can be used to implement the mono-crystalline silicon growth method shown inFIG. 4toFIG. 5F. In the initiation step S120of the mono-crystalline silicon growth method, when the seed crystal6contacts the liquid surface M1of the silicon melt M to solidify to form the crystal7, the fluid in the water flow channel531and/or the gas flow channel533can take away the heat near the clamping portion532to prevent the clamping portion532from being affected by the heat of the silicon melt M in the crucible3. The hard shaft53can move forth and back in the pulling speed along the axial direction of the tube body511. The seed crystal6at the clamping portion532correspondingly moves forth and back in the pulling speed in the crucible3so as to effectively control a seeding operation and a seeding effect of the seed crystal6at the clamping portion532.

According to the present embodiment, the temperature of the thermal field around the crucible3can be adjusted according to growth requirements of the crystal7in the crystallization process. Because the fluid in the water flow channel531and/or the gas flow channel533can take away the heat and the heating power (or the total heat output) of the heating module4, an outer wall and the outer bottom surface32of the crucible3can be appropriately cooled down so that a bottom side of the crystal7is maintained in a solid state and the temperature of the crystal7in a central region is not affected, which prevents the heat generated by the heating module4disposed at an outer periphery of the crucible3from over-concentrating at four corners and prevents the crystal7growing vertically from sticking to the inner bottom surface33of the crucible. Therefore, the crystal7can be prevented from internally forming an excessive temperature gradient, the inner stress of the crystal7can be effectively controlled so that the growing speed and quality of the crystal7growing vertically can be controlled effectively to provide the mono-crystalline silicon ingot8with a better growth.

In addition, in the crystallization process, with the co-influence of the heat adjusting function of the fluid in the water flow channel531and/or the gas flow channel533and the heat preservation function of the heat preservation sheets52, a horizontal temperature gradient of the silicon melt M in the crucible3is small so as to control the horizontal crystallization speed of the crystal7to be smaller than the vertical crystallization speed of the crystal7and prevent the clamping portion532from being partially subcooled.

In conclusion, the mono-crystalline silicon growth method in the present embodiment of the present disclosure uses the support base and the crucible unrotatably disposed in the furnace, takes advantage of the heating module to appropriately adjust the temperature around the crucible, prevents the seed crystal from melting unevenly in the crystallization process of the mono-crystalline silicon ingot, and prevents the crystal from internally forming a temperature gradient that is too large so that the crystal does not stick to the inner bottom surface of the crucible, and the inner stress of the crystal can therefore be controlled. Therefore, the seed crystal goes through the crystal growing process smoothly, and a crystal growing effect of the crystal and the quality of the mono-crystalline silicon ingot are improved. As a result, by using the mono-crystalline silicon growth method, a usage rate of the crystal rod and a production yield are increased.