KR101198876B1

KR101198876B1 - Furnace raising and lowering unit for silicon single crystal ingot forming apparatus and silicon single crystal ingot forming apparatus having the same

Info

Publication number: KR101198876B1
Application number: KR1020100008310A
Authority: KR
Inventors: 김용욱
Original assignee: 주식회사 코원이노텍
Priority date: 2010-01-29
Filing date: 2010-01-29
Publication date: 2012-11-07
Also published as: KR20110088689A

Abstract

The present invention relates to a heating up and down unit for selectively raising and lowering a heating furnace by selectively applying a low speed and a high speed mode (Run / Fast Mode) to raise and grow molten silicon into a silicon single crystal ingot in the heating furnace. In more detail, two motors and a drive transmission structure which are individually operated for each mode are applied to the ball screw and the ball nut which are interlocked with the heating furnace in order to raise and lower the heating furnace. The present invention relates to a heating and lowering unit for a silicon single crystal ingot forming apparatus which can be minimized and to facilitate replacement in case of an abnormality of an individual motor and a drive transmission unit, and a silicon single crystal ingot forming apparatus having the same. The present invention is provided with a low-speed and high-speed motor, respectively, in the heating unit lifting unit, each motor is operated by the ball screw and the ball nut to be linked to the heating furnace separately, so that one motor is fixed when the other motor is driven As the motor rotates independently, the rising and falling of the heating furnace is mechanically stable, and the vibration generated when the heating furnace is rising and falling is minimized. It is easy to replace, and has the effect of reducing the maintenance cost.

Description

Furnace elevating unit for silicon single crystal ingot forming apparatus and silicon single crystal ingot forming apparatus having the same {.}

The present invention relates to a heating up and down unit for selectively raising and lowering a heating furnace by selectively applying a low speed and a high speed mode (Run / Fast Mode) to raise and grow molten silicon into a silicon single crystal ingot in the heating furnace. In more detail, two motors and a drive transmission structure which are individually operated for each mode are applied to the ball screw and the ball nut which are interlocked with the heating furnace in order to raise and lower the heating furnace. The present invention relates to a heating and lowering unit for a silicon single crystal ingot forming apparatus which can be minimized and to facilitate replacement in case of an abnormality of an individual motor and a drive transmission unit, and a silicon single crystal ingot forming apparatus having the same.

In general, a silicon wafer used in semiconductor manufacturing is used to insert polycrystalline silicon into a heating furnace (quartz crucible) of a single crystal growth apparatus and heat it to form a silicon single crystal ingot in the form of a round bar, which is then plated. It is made by cutting.

This silicon-crystal single crystal ingot is grown by the cz (Chocoralsk) method or the fz (plot zone) method, and about 80% of the silicon substrate is used by the cz method. The cz method is a technique of attaching seed crystals to the shaft of a silicon listing device and pulling a melt (silicon polycrystalline body) put into a quartz heating furnace.

As such, the silicon single crystal ingot is mounted on the seed connecting chuck at the end of the wire connected to the motor, and is processed while being rotated while being put in a heating furnace.

Referring to FIG. 1, a general silicon single crystal ingot forming apparatus includes a heating furnace 3 in which a silicon solution S is stored, a heater 4 surrounding the heating furnace 3 so that the heating furnace 3 is heated, and a heater. (4) a reaction chamber having a heat shield 5 formed in a hollow shape and a heating furnace 3, a heater 4, and a heat shield 5 installed therein and a through hole formed through the bottom surface to surround the 4 1) and a wire (W) to which a seed crystal (Seed) is connected.

In order to manufacture the silicon single crystal ingot (I) using the above-described ingot forming apparatus, first, ultrahigh-purity polycrystalline silicon and boron are charged into the heating furnace 3 and then heated by the heater 4. To melt.

The heater 4 melts a high-purity polycrystalline silicon mass loaded in the furnace 3 into a silicon solution S, and the heat shield 5 surrounding the heater 4 is radiated from the heater 4. The heat is prevented from diffusing to the outer wall side of the reaction chamber 1 to improve the thermal efficiency.

Subsequently, after soaking the seed crystals connected by the seed connecting chuck (not shown) provided at the bottom of the wire W in the dissolved silicon solution S, the silicon single crystal ingot I is grown by slowly pulling it while rotating. .

A wire pulling unit (not shown) is formed on the upper portion of the reaction chamber 1 to wind and pull the wire W, and a silicon solution in the heating furnace 3 is disposed at the lower end of the wire W. A seed connecting chuck (not shown) is provided to connect the seed crystals grown into the single crystal ingot I while being brought into contact with (S).

The wire pulling unit winds up the wire W and grows at the same time as the single crystal ingot I grows.

The heating furnace 3 is fixedly installed on the shaft 2, and the shaft 2 is provided by the heating furnace elevating unit (not shown) provided in the lower portion of the reaction chamber 1. 3) is raised and lowered.

At this time, the seed crystal is pulled while rotating about the same axis as the shaft 2 of the heating furnace 3 by the wire pulling unit, and the heating furnace 3 is a solid solution of the silicon solution S and the seed crystal. -The silicon single crystal ingot (I) is grown at a constant speed by the heating unit elevating unit so that the liquid interface maintains the same height.

When rotating while pulling the molten silicon (S) grows into a rod-shaped silicon single crystal ingot (I), depending on the pulling speed and rotation speed and the temperature change of the heating furnace (3) good or bad silicon single crystal ingot (I). Therefore, when pulling and growing the molten silicon (S) in the furnace (3), no shock and vibration should be applied, but must be rotated and pulled at a constant speed.

Typically, the furnace up and down unit provided in the silicon single crystal ingot forming apparatus adjusts the up and down speed of the furnace to selectively apply a low speed and a high speed mode (Run / Fast Mode).

Accordingly, the silicon single crystal ingot forming apparatus is mechanically stable in the rise and fall of the heating furnace, and it is easy to replace parts, such as a motor, in the event of an abnormality of the device, thereby minimizing vibration generated when the heating furnace is raised and lowered. In order to reduce the production and maintenance costs, a heating and lowering unit is needed.

The present invention is to solve the above-mentioned problems, to achieve a mechanical structure having a low speed and high speed motor and a drive transmission unit that is individually operated for each mode in the ball screw and ball nut interlocked with the heating furnace to raise and lower the heating furnace. , Heating furnace elevating unit and a unit for the silicon single crystal ingot forming apparatus which can minimize the vibration generated during the raising and lowering of the furnace, and easily replaces in case of abnormal parts of each motor, drive transmission, and the like. It is an object to provide a silicon single crystal ingot forming apparatus.

The structure of the present invention for achieving the above object is a heating furnace elevating unit for raising and lowering the heating furnace provided in the reaction chamber of the silicon single crystal ingot forming apparatus at a predetermined speed, the upper and lower support panels and the vertical therebetween Consists of a guide post connected to, the support frame located below the reaction chamber; A lifting body which flows up and down with the guide post as an axis, the upper part of which is interlockably connected to a lower end of the shaft of the heating furnace, and on one side thereof, a body connection part extending; A ball screw installed in parallel with the guide post between the upper and lower support panels to be axially rotated; A first motor unit provided at a lower end of the ball screw to drive the ball screw at low speed; A ball nut connected to the outer circumference of the ball screw, the ball nut being coupled to the inside of the body connection part of the lifting body to move the lifting body up and down according to rotation; One shaft portion is connected to the lower end of the ball nut, the drive transmission unit is installed to rotate the ball nut through the rotational force of the other shaft portion in parallel; And a second motor part provided at an outer side of the body connection part to drive the other shaft part of the drive transmission part at a high speed rotation, wherein the first and second motor parts operate individually, respectively, to raise and lower the heating furnace. It is characterized in that the speed is made to be adjusted to low or high speed.

In addition, a ball bearing is provided between the outer upper end of the ball nut and the inner surface of the body connection part, characterized in that the interconnection.

In addition, the drive transmission unit is characterized in that the usual timing belt is applied.

In addition, the drive transmission is characterized in that the usual timing belt or gear is applied.

The present invention provides a reaction chamber including a heating furnace containing a silicon solution, a heater for heating the heating furnace, and a heat shield installed inside the heater to block heat emitted therefrom; A wire pulling unit installed at an upper portion of the reaction chamber, the wire pulling unit having a seed connection chuck connected to a seed crystal for growing a single crystal ingot at a lower end of the wire by winding the wire by a motor; And a heating furnace elevating unit for the silicon single crystal ingot forming apparatus described above.

The present invention is provided with a low-speed and high-speed motor, respectively, in the heating unit lifting unit, each motor is operated by the ball screw and the ball nut to be linked to the heating furnace separately, so that one motor is fixed when the other motor is driven As the motor rotates independently, the rising and falling of the heating furnace is mechanically stable, and the vibration generated when the heating furnace is rising and falling is minimized. It is easy to replace, and has the effect of reducing the maintenance cost.

1 is a view schematically showing the configuration of a conventional silicon single crystal ingot forming apparatus in the related art.
FIG. 2 is a diagram schematically showing the structure of a silicon single crystal ingot forming apparatus having a heating furnace elevating unit of the present invention.
3 is a view showing a connection relationship between the heating unit lifting unit and the heating furnace of the present invention.
4 is a view showing the structure and operating state of the heating unit lifting unit of the present invention.

Hereinafter, the present invention will be described with reference to the accompanying drawings, and in the following description, when it is determined that a detailed description of a related well-known function or configuration may unnecessarily obscure the subject matter of the present invention, The description may be omitted.

FIG. 2 is a diagram schematically showing the structure of a silicon single crystal ingot forming apparatus having a heating furnace elevating unit of the present invention.

Referring to FIG. 2, the silicon single crystal ingot forming apparatus of the present invention includes a reaction chamber 100, a wire pulling unit 200, and a heating unit lifting unit 300.

The reaction chamber 100 heats the heating furnace 110 by the heating furnace 110 and the heater 120 accommodating polysilicon to melt the silicon solution S, and heats the heater 120. It is surrounded by a heat shield (not shown) to block the heat dissipated to the outside.

The wire pulling unit 200 is installed on the upper portion of the reaction chamber 100 to wind and rotate the wire W provided with the seed connecting chuck 210 at the bottom thereof.

Heating unit lifting unit 300 is connected to the shaft 112 of the reaction chamber 100, serves to raise and lower the heating furnace 110 at a predetermined speed (low speed and high speed mode).

At this time, the seed crystal mounted on the seed connecting chuck 210 of the lower end of the wire (W) is immersed in the silicon solution (S) in the heating furnace 110, and gradually rotated and pulled by the wire pulling unit (200). As a result, the silicon single crystal ingot (I) is grown while being exposed to room temperature.

3 is a view showing the connection relationship between the heating unit lifting unit and the heating furnace of the present invention, Figure 4 is a view showing the structure and operation state of the heating unit lifting unit of the present invention.

3 to 4, the heating unit lifting unit 300 provided in the silicon single crystal ingot forming apparatus of the present invention is a support frame 310, the lifting body 330, the ball screw 340, the ball The nut 350, the first and second motor parts M1 and M2, and the driving transmission part 360 are formed.

The support frame 310 is composed of guide posts 314 provided with one or more pairs connected to each other so as to be perpendicular between the horizontally arranged upper and lower support panels 312, and are positioned below the reaction chamber 100 to apply a load. Support.

The lifting body 330 is connected to the guide posts 314 in a vertical direction through the corner portion, and flows up and down along the height of the guide post 314.

One side of the elevating body 330 is a body connecting portion 332 is extended to be linked to the ball nut 350 to be described later, the upper side of the central shaft 112 of the heating furnace 110 is connected to the structure In this case, as the lifting body 330 is raised and lowered ball nut 350, it serves to raise and lower the heating furnace (110).

Ball screw 340 is parallel to the guide post 314 to be located on the side of the lifting body 330, provided vertically between the upper and lower support panels 312, the first motor provided at the lower end It is installed so that shaft rotation is possible by the part M1.

A male screw thread in the form of a screw is formed around the ball screw 340, and a ball nut 350 having a female thread formed therein is connected to the ball screw 340 by screw connection.

Accordingly, as either the ball nut 350 or the ball screw 340 is driven to rotate, the ball nut 350 rises and falls along the outer circumference of the ball screw 340.

When the outer upper end of the ball nut 350 and the inner surface of the body connecting portion 332 are connected to each other, a ball bearing B is provided therebetween, and when the ball nut 350 rotates, the ball nut 350 rises and falls, The lifting body 330 is interlocked up and down at the same time.

The drive transmission unit 360 serves to transmit the rotational force of the parallel shaft, it is preferable that a conventional transmission device such as a timing belt or gear (Gear) is applied.

One shaft portion of the drive transmission unit 360 is connected to the lower end of the ball nut 350, the second motor portion M2 is connected to the other shaft portion, when the second motor portion (M2) is rotationally driven, the The ball nut 350 is rotated up / down along the outer circumference of the ball screw 340.

The first motor unit M1 and the second motor unit M2 are provided at the lower end of the ball screw 340, and the first motor unit M1 rotates the ball screw 340. 2 motor portion (M2) is provided on the outer side of the body connection portion 332, thereby rotating the ball nut 350.

In this case, the first motor unit M1 includes a low speed reducer 370 to rotate the ball screw 340 at low speed, and the second motor unit M2 rotates the ball nut 350 at high speed. It is preferable that each of them be driven separately.

Accordingly, when the low temperature mode is applied so that the heating unit raising and lowering unit 300 raises the heating furnace 110 slowly, the heating unit elevating unit 300 of the present invention drives the first motor unit M1 and rapidly heats the heating unit 110. When the high speed mode is applied to increase, the second motor unit M2 is driven to adjust the raising and lowering speed of the heating furnace 110.

As such, although the invention has been described by way of limited embodiments and drawings, the invention is not limited thereto and is within the scope of equivalents of ordinary skill and the claims to be described below in the technical field to which the invention pertains. Various modifications and variations are possible, of course.

100: reaction chamber 110: heating furnace
120: heater 200: wire pulling unit
210: seed connecting chuck 300: heating unit lifting unit
310: support frame 312: upper and lower support panels
314: guide post 330: lifting body
332: body connection 340: ball screw
350: ball nut 360: drive transmission unit
370: reducer B: ball bearing
M1, M2: 1st, 2nd motor part I: Ingot
W: wire

Claims

In the heating furnace lifting unit for raising and lowering the heating furnace provided in the reaction chamber of the silicon single crystal ingot forming apparatus at a predetermined speed,
A support frame positioned below the reaction chamber, the guide post being vertically connected between the upper and lower support panels;
A lifting body which flows up and down with the guide post as an axis, the upper part of which is interlockably connected to a lower end of the shaft of the heating furnace, and on one side thereof, a body connection part extending;
A ball screw installed in parallel with the guide post between the upper and lower support panels to be axially rotated;
A first motor unit provided at a lower end of the ball screw to drive the ball screw at low speed;
A ball nut connected to the outer circumference of the ball screw, the ball nut being coupled to the inside of the body connection part of the lifting body to move the lifting body up and down according to rotation;
One shaft portion is connected to the lower end of the ball nut, the drive transmission unit is installed to rotate the ball nut through the rotational force of the other shaft portion in parallel; And
And a second motor part provided at an outer side of the body connection part to drive the other shaft part of the drive transmission part at high speed.
The first and second motor parts are operated separately, so that the rising and falling speed of the heating furnace is adjusted to a low speed or a high speed,
Between the outer upper end of the ball nut and the inner surface of the body connecting portion is provided with a ball bearing are interconnected,
The drive transmission unit is a heating up and down unit for a silicon single crystal ingot forming apparatus, characterized in that the usual timing belt or gear is applied.

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A reaction chamber including a heating furnace containing a silicon solution, a heater for heating the heating furnace, and a heat shield installed inside the heater to block heat from being emitted;
A wire pulling unit installed at an upper portion of the reaction chamber, the wire pulling unit having a seed connection chuck connected to a seed crystal for growing a single crystal ingot at a lower end of the wire by winding the wire by a motor; And
The silicon single crystal ingot forming apparatus according to claim 1, comprising a heating furnace elevating unit for a silicon single crystal ingot forming apparatus.