KR20110118537A - Thermal radiation heating type linear effusion cell - Google Patents

Abstract

A heat radiation heating type linear evaporation source device capable of improving the uniformity of an organic thin film deposited in a vacuum atmosphere is provided. The linear evaporation source device includes a first crucible having a source material stored therein and having an opening at one side, a second crucible arranged to surround the first crucible outside the first crucible, and an exotherm that heats the source material by supplying heat to the second crucible. And a lid partially covering the opening of the first crucible. The first crucible is heated by the heat conduction and / or thermal radiation of the second crucible.

Description

Heat radiation heating type linear evaporation source device {THERMAL RADIATION HEATING TYPE LINEAR EFFUSION CELL}

The present invention relates to an evaporation source device for evaporating an organic source material in a vacuum atmosphere, and more particularly, to a heat radiation heating type linear evaporation source device capable of improving the uniformity of a deposited organic material thin film.

Crucible type Effusion Cell for vacuum deposition is a key device that is essential for Molecular Beam Epitaxy or Organic Molecular Beam Deposition. These devices are essential for achieving optimal performance of optical devices or organic displays where impurities must be rejected as much as possible.

In fabricating an organic display device, since a conventional resistive heating evaporation source uses a planar or coil type heating element, minute temperature control of the organic material itself is almost impossible, and it is difficult to fundamentally solve an impurity inflow problem. In addition, in the case of the existing high-temperature crucible-type evaporation source is used to form a heating element in the form of a rotating body or by processing a plate-like resistor, such a structure is not possible to finely control the temperature because the heat transfer and release during operation of the heating element.

Therefore, in the reference evaporation source, it is difficult to control the thickness of a thin film to be deposited. In addition, since it is not easy to control the heat distribution applied to the source, the organic material source does not evaporate from the top, so that it is difficult to deposit and there is a problem in that a nozzle phenomenon occurs.

Moreover, in the deposition method using the conventional evaporation source, temperature control is performed by contacting the temperature sensor to the surface of the crucible or the side surface. However, this method results in a large deviation between the temperature of the actual source and the measured temperature of the temperature sensor, and the position of the temperature sensor is too close to the heat source than the source, so practical control is impossible. In particular, at low temperatures between 200 ° C and 350 ° C, the temperature deviation between the temperature measured by the temperature sensor and the actual source is often more than ± 1 ° C above the set point. Therefore, the conventional method has a problem that it is very difficult to control the amount of evaporation in depositing a sublimable material such as an organic material.

SUMMARY OF THE INVENTION The present invention has been made to solve the problems described above, and an object thereof is to provide a heat radiation heating type linear evaporation source device capable of controlling heat distribution in a crucible under optimum conditions for organic material deposition.

Another object of the present invention is to provide a heat radiation heating type linear evaporation source device that can reduce the temperature variation of the middle and the edge of the linear evaporation source crucible by adjusting the vertical arrangement interval of the vertical array heating element.

Yet another object of the present invention is to arrange the components to have an inverted triangular structure that is lowered as the temperature gradient for the source material in the crucible is lowered, thereby heat radiation which can greatly improve the uniformity of the thin film deposited on the substrate. It is to provide a heating linear evaporation source device.

According to an aspect of the present invention to solve the above technical problem, a first crucible having a source material is stored and having an opening at one side; A second crucible installed to surround the first crucible outside the first crucible; A heat generating unit for heating the source material by supplying heat to the second crucible; And a lid which partially covers the opening of the first crucible, a heat radiation heating type linear evaporation source device is provided. Here, the first crucible is heated by the heat conduction of the second crucible.

In one embodiment, the second crucible comprises an upper second crucible and a lower second crucible detachably coupled to each other.

In one embodiment, the heat generating portion is disposed along the upper outer circumferential surface of the upper second crucible.

In one embodiment, the wall thickness of the lower second crucible is thinner than the portion adjacent to the upper second crucible.

In one embodiment, the heating portion comprises a meandering resistance wire, the density of the resistance wire located on the outer circumferential surface of the second crucible in the direction orthogonal to the direction in which the source material is evaporated and discharged at the edge than the center portion of the second crucible Bigger

In one embodiment, the thermal radiation heated linear evaporation source device further comprises a lower support supporting a lower side of the lower second crucible facing the lid and having a higher thermal conductivity than the lid.

In one embodiment, the lid comprises a graphite plate that is heated by thermal conduction of the second crucible.

In one embodiment, the thermal radiation heated linear evaporation source device further comprises a first crucible and a second crucible, a heat generating portion, a lower support, and a reflecting plate surrounding the cover.

In one embodiment, the thermal radiation heated linear evaporation source device further comprises a first heat shield arranged to face the cover with the reflecting plate therebetween and blocking heat dissipation to the cover portion.

In one embodiment, the heat radiation heating type linear evaporation source device further comprises a second heat shield arranged on the side facing the heating portion with the cover in between and blocking heat emitted to the outside through the cover.

In one embodiment, the lid of the heat radiation heated linear evaporation source device has an outlet for discharging the source material out of the first crucible, the outlet penetrating in a zigzag form inside the body of the lid.

In one embodiment, the thermal radiation heated linear evaporation source device further comprises an adjustment unit arranged at the edge of the outlet of the cover from which the source material is evaporated and for controlling the size and direction of the outlet.

According to the present invention, it is possible to provide a temperature gradient in the crucible under optimal conditions for organic material deposition. That is, the temperature of the crucible can be precisely controlled by the double crucible structure and the vertically arranged heating part structure in order to reduce the temperature variation of the entire crucible. Therefore, the organic material source with low thermal conductivity in the crucible can evaporate from the top of the crucible, thereby minimizing the phenomena of the organic material source and increasing the evaporation rate.

In addition, the temperature variation of the middle portion and the edge portion of the crucible can be reduced by adjusting the vertical arrangement interval of the vertically arranged heating portion.

In addition, by adjusting the size or structure of the outlet of the upper portion of the crucible by the cover or cover and the control unit, it is possible to precisely control the temperature gradient of the crucible while adjusting the deposition amount and uniformity of the organic source.

By employing the heat radiation heating type linear evaporation source device of the present invention, it is possible to dramatically increase the uniformity of the organic thin film deposited on the substrate.

1 is a schematic cross-sectional view of a heat radiation heating linear evaporation source device according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view illustrating a shape of a second crucible that can be separated from the upper and lower parts that can be employed in the linear evaporation source device of FIG. 1.
3A and 3B are cross-sectional views illustrating another crucible structure that can be employed as the lower second crucible in the second crucible of FIG. 2.
4A is a plan view schematically illustrating a lid structure employed in the linear evaporation source device of FIG. 1.
4B is a cross-sectional view taken along line IV-IV of the lid of FIG. 4A.
FIG. 5A is a plan view schematically showing another cover structure employable in the linear evaporation source device of FIG. 1. FIG.
FIG. 5B is a cross-sectional view taken along the line VV of the lid of FIG. 5A.
FIG. 6A is a plan view schematically showing another cover structure that may be employed in the linear evaporation source device of FIG. 1. FIG.
FIG. 6B is a cross-sectional view taken along line VI-VI of the lid of FIG. 6A.
FIG. 7A is a view schematically illustrating a heat generation unit structure that may be employed in the linear evaporation source device of FIG. 1.
FIG. 7B is a view schematically showing another heat generating unit structure which may be employed in the linear evaporation source device of FIG. 1.
8 is a partially exploded perspective view showing a heat radiation heating type linear evaporation source device according to an embodiment of the present invention in three dimensions.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

First, the overall configuration of a heat radiation heating type linear evaporation source device according to an embodiment of the present invention will be described as follows.

The heat radiation heating type linear evaporation source device is a device for heating and evaporating a source material contained in a crucible in a vacuum atmosphere, and includes a crucible, a heating part, and a lid.

The crucible stores the source material, in particular the crucible has a double crucible structure for precise heating of the source material and precise control of the temperature gradient of the source material. The dual crucible structure includes an inner crucible (or first crucible) and an outer crucible (or second crucible), which distributes heat evenly to the inner crucible containing the source material. The outer crucible preferably comprises an upper outer crucible (or an upper second crucible) and a lower outer crucible (or a lower second crucible) for a temperature gradient between the upper and lower portions of the inner crucible.

The heat generating portion is a heat source for supplying heat to the crucible and is preferably formed of a resistance wire. By using the resistance wire, the heat generating portion can be provided in a vertically arranged structure, for example, to reduce the overall temperature variation of the crucible, in particular, the temperature variation in the longitudinal direction of the linear crucible, for proper application to the linear evaporation source device. Here, the vertical refers to a direction extending in a direction substantially perpendicular to the longitudinal direction of the linear crucible. In the above case, when the heat generating unit is arranged on the outer circumferential surface of the upper outer crucible, the inner crucible and the source material therein are heated by heat conduction or heat radiation of the outer crucible, where the inner crucible and the source material are heated to the bottom of the crucible. Will have a lower temperature gradient.

The lid has an outlet through which source material evaporated in the crucible is discharged. The lid partially covers the opening of the crucible so that the temperature of the top of the crucible is the highest temperature in the entire crucible. In particular, the cover is preferably formed of carbon or carbon composite material. For example, a graphite plate which can vary in size may be used as the cover. In that case, it is possible to prevent the radiation of thermal radiation through the cover and to easily control the molecular beam emission and direction of the source material.

Various embodiments that can be employed in the heat radiation heating type linear evaporation source apparatus of the present invention will be described in more detail below.

1 is a schematic cross-sectional view of a heat radiation heating linear evaporation source device according to an embodiment of the present invention.

Referring to Fig. 1, a heat radiation heating type linear evaporation source device (hereinafter referred to as a linear evaporation source device) 1 according to the present embodiment is a first crucible 5, a second crucible 6, and a heat generating unit 9. , And cover 2. In addition, the linear evaporation source device 1 further includes a lower support 8, a reflector 10, a first heat shield 3, and a second heat shield 4.

The first crucible 5 stores the organic source material 11 and its inlet (or opening) is open upwards. The first crucible 5 may be implemented as a quartz crucible.

The second crucible 6 is installed to surround the first crucible 5 except for the upper side opening of the first crucible 5. The second crucible 6 may be implemented with a graphite crucible.

The heat generating portion 9 is disposed along the outer peripheral surface of the upper side of the second crucible 6, dissipates heat and heats the second crucible 6.

The lid 2 partially covers the opening of the first crucible 5. In other words, the lid 2 has a discharge for discharging the source material 11 evaporated in the first crucible 5 and is arranged in the opening of the first crucible 5. The cover 2 prevents heat radiation waves inside the first crucible 5 or the heat generating part 9 from being radiated to the upper side of the crucible, and controls the direction and the emission of the molecular beams emitted from the first crucible 5. As the material of the lid 2, a graphite plate may be used.

The lower support 8 supports the lower side of the second crucible 6. Here, the lower side of the second crucible 6 refers to the side facing the upper side or the side opposite to the upper side when the portion adjacent to the lid 2 in the second crucible 6 is the upper side. do. The lower support 8 is formed of a material having excellent heat dissipation so that the lower side of the second crucible 6 can be cooled more easily than the upper side, that is, the cooling of the lower side can be induced to a desired degree. The heat dissipation of the lower support 8 is preferably at least greater than the heat dissipation of the lid 2, and a metal or alloy material may be used as the material of the lower support 8.

The reflector 10 is disposed outside the heat generating unit 9 to reflect the heat of the heat generating unit 9 to increase the thermal efficiency of the second crucible 6. The reflecting plate 10 is preferably arranged to surround the entire second crucible 6 together with the heat generating portion 9. As the reflective plate 10, a heat reflection insulating material such as an aluminum plate or the like, or a member coated with a reflective insulating film on at least one surface of a general heat insulating material may be used.

The first heat shield 3 is disposed above the heat generating portion 9 and the outer side surfaces of the first and second crucibles 5 and 6 to increase the heating effect of the lid 2 and to the upper side of the reflecting plate 10. To block the heat released to the outside. The first heat shield 3 may be implemented as a separate heat reflection insulating material, a reflective heat insulating film, or a heat insulating material coated with a reflective heat insulating film.

The second heat shield 4 is disposed on the top of the cover 2 to minimize heat loss to the outside. The second heat shield 4 may be embodied in a material similar to the first heat shield 3. In addition, the second heat shield 4 may be integrally formed with the first heat shield 3.

Referring to the operation of the linear evaporation source device according to this embodiment is as follows.

When the heat generating unit 9 is operated, the second crucible 6 is heated by the heat of the heat generating unit 9. The first crucible 5 is heated by the heat conduction and heat radiation of the heated second crucible 6, where the first crucible 5 transmits heat radiation waves transmitted from the second crucible 6 to the source material therein. (11) acts to heat. The heated organic source material 11 is evaporated and discharged out of the crucible in the form of a molecular beam.

In the present embodiment, the reflector 10 performs a function of maximizing the heat radiation wave transmitted to the second crucible 6 by reflecting the heat radiation wave inside without dissipating heat emitted from the heat generation unit 9 to the outside. do.

When the heat radiation wave is first transmitted to the upper portion of the second crucible 6 by the heat generator 9 arranged on the upper side of the second crucible 6, the lower part and the lid of the second crucible 6 are heated by heat conduction. (2) is heated. At this time, the temperature gradient in the entire linear evaporation source device 1 is covered by the cover 2 and the first by the heat generating unit 9 arranged on the upper part of the second crucible 6 and the lower support 8 supporting the lower side. The upper part of the second crucible 6 and the lower part of the second crucible 6 have a form in which the temperature decreases in the order described. That is, the temperature gradient inside the first crucible 5 has a temperature gradient in the form of inverse pyramid in which the temperature is lowered from the upper side where the cover 2 is located to the lower side where the lower support 8 is located.

Due to the inverse structure of the above-described temperature gradient, the organic material having low thermal conductivity can be evaporated from above in the state stored in the first crucible 5. This indicates that the device of the present embodiment can minimize the swelling of the organic source material 11 and increase the evaporation rate of the organic source material 11.

Furthermore, in the linear evaporation source device 1 according to the present embodiment, the heat radiating outside the crucible is adopted by employing the first heat-transmitting portion 3 arranged to display the upper end of the reflecting plate 10 and face the cover 2. Blocking, minimizing heat loss and maximizing the heating effect so that the temperature of the cover 2 is formed relatively high throughout the device.

In addition, in the linear evaporation source device 1 according to the present embodiment, by arranging the second heat-blocking portion 4 on the upper portion of the first heat-transfer portion 3, the heat flowing out to the outside is doubled to be lost in the direction of the substrate. Minimize heat According to the second heat shield 4, the effect of undesirably heating the substrate can be minimized.

By employing the first heat shield 3 and / or the second heat shield 4 described above, it is possible to prevent a crocking phenomenon in which the source material 11 blocks the outlet of the lid 2.

FIG. 2 is a cross-sectional view illustrating a shape of a second crucible that can be separated from the upper and lower parts that can be employed in the linear evaporation source device of FIG. 1.

In the linear evaporation source apparatus according to the present embodiment, the second crucible may adopt the second crucible as a separate structure as shown in FIG. 2 for a more effective temperature gradient between the upper and lower portions of the second crucible. For example, the second crucible comprises an upper second crucible 6a and a lower second crucible 6b.

The upper second crucible 6a and the lower second crucible 6b are independently manufactured and combined. The upper second crucible 6a and the lower second crucible 6b may be detachably coupled to each other. The upper second crucible 6a and the lower second crucible 6b may have coupling portions 7a and 7b for coupling with each other. The pair of coupling parts 7a and 7b may have a concave-convex shape to be mated with each other. Of course, the second crucible according to the present embodiment may be implemented such that an intermediate second crucible (not shown) is arranged between the upper second crucible 6a and the lower second crucible 6b.

If the second crucible consists of a plurality of crucibles, and the plurality of crucibles are arranged by stacking a plurality of crucibles in a direction substantially parallel to the direction in which the source material evaporates (hereinafter referred to as a vertical direction), the lid and the lower support are more easily The temperature of the second crucible may be lowered from the upper side to the lower side in between. According to the above-described configuration, it is possible to easily perform temperature control for evaporating the organic material source in the first crucible from above.

3A and 3B are cross-sectional views illustrating another crucible structure that can be employed as the lower second crucible in the second crucible of FIG. 2.

The second crucible according to the present embodiment includes an upper second crucible (not shown) and a lower second crucible 6c. However, the upper second crucible and the lower second crucible 6c according to the present exemplary embodiment may not be provided with a separate coupling portion and may be fitted and arranged by other components. For example, the lower second crucible 6c may have an upper end portion 7c having a flat cross section as shown in FIG. 3A.

In addition, in another embodiment of the present invention, the wall thickness of the lower second crucible 6d may be configured differently at the upper side and the lower side. As shown in Fig. 3B, in the lower second crucible 6d, the wall thickness w2 on the lower side is thinner than the wall thickness w1 on the upper side. According to this structure, since the amount of heat conduction or energy of the heat radiation wave from the coupling portion 7b side of the lower second crucible 6d can be easily reduced, the heat applied to the first crucible and the organic source material inside the crucible The amount of energy can be reduced efficiently. That is, according to this embodiment, by varying the wall thickness of the lower second crucible 6d in addition to the cover, the lower support, and / or the first and second thermal barriers and the coupling structure, the temperature of the source material is increased from the upper surface. The temperature of the source material can be easily controlled to be lowered downward.

In the above-described configuration, the basic structure of the second crucible may include the upper second crucible 6a and the lower second crucible 6b of FIG. 2. However, the lower second crucible of the type shown in FIG. 3A or 3B may be replaced and used according to the type and characteristics of the source material.

4 is a view schematically showing a cover structure employed in the linear evaporation source device of FIG. 1. Fig. 4A is a plan view of the lid, and Fig. 4B is a sectional view taken along line IV-IV of the lid.

Referring to FIG. 4, the lid 2 has a lid body 21 and a linear opening or linear outlet 23 through the lid body 21. When the emitted organic source material is deposited on the substrate, the amount of source material radiated at both ends of the linear outlet 23 of the lid 2 is less than the amount of source material radiated at the center of the linear outlet 23. Therefore, the thicknesses of both ends of the deposited thin film may be formed relatively thinner than the thickness of the thin film in the center thereof. To overcome this, the size or structure of the outlet 23 of the lid 2 can be adjusted.

FIG. 5 is a view schematically showing another cover structure that may be employed in the linear evaporation source device of FIG. 1. FIG. 5A is a plan view of the lid, and FIG. 5B is a cross-sectional view taken along the line VV of the lid.

Referring to FIG. 5, the cover 2a according to the present embodiment includes a cover body 21a and a discharge part 23a in the form of a nozzle passing through the cover body 21a in a zigzag form. According to this embodiment, the heat radiation wave inside the crucible heated by the heat generating portion easily flows to the outside through the discharge portion opened on the top of the crucible, thereby lowering the temperature of the crucible upper portion and applying unwanted thermal energy to the substrate. The increase in temperature can be prevented.

In addition, by adopting the above-described zigzag discharge portion 23a, not only can the primary radiation radiation emitted to the outside be blocked, but also the phenomena of the source material can be prevented. For example, when the deposition rate of the source material is increased, spalling of the source material may easily occur. In this case, the nozzle 23 may be ejected to the outside of the crucible due to the discharge portion 23a of the nozzle type as shown in FIG. The source material can be sent back into the crucible and only the molecular beams of the source material radiated by heat can be sprayed upwards.

FIG. 6 is a view schematically showing another cover structure employable in the linear evaporation source device of FIG. 1. Fig. 6A is a plan view of the lid, and Fig. 6B is a sectional view taken along the line VI-VI of the lid.

Referring to FIG. 6, the lid 2b according to the present embodiment has an adjustment coupled to the lid body 21, the linear discharge portion 23 penetrating the lid body 21, and the linear discharge portion 23. The part 12 is provided. In the present embodiment, by adopting the adjusting unit 12, it is possible to adjust the discharge direction and the discharge amount of the molecular beam of the source material coming out through the linear discharge unit 23. The adjusting unit 12 functions as a adjusting plate for adjusting the deposition amount and uniformity of the thin film on the substrate, and by using such adjusting unit, uniform thin film deposition is possible on a large area substrate.

According to the above-described embodiments, by adopting a control unit coupled to the size or structure or the outlet of the outlet of the lid, it is possible to ensure that the temperature of the top of the lid or crucible is maintained at the highest throughout the device while blocking unwanted outflow of heat radiation waves. In addition, the emission and direction of the organic source material can be easily controlled.

FIG. 7A is a view schematically illustrating a heat generation unit structure that may be employed in the linear evaporation source device of FIG. 1.

Referring to FIG. 7A, the heat generating unit 9 according to the present exemplary embodiment includes a resistance wire 90 installed in a constant or regular arrangement on an upper surface of the outer circumferential surface of the second crucible or on the outer surface of the upper second crucible. . Both ends 91 and 92 of the resistance line 90 are connected to a power source (not shown). The regular arrangement has a longer extension in the y direction than an extension in the x direction as shown in FIG. 7A, and resistance lines at the intermediate portion 93b and its ends or edges 93a and 93c in the x direction. It is possible to have a meandering form in which the spacing or density of 90 is constant. As the resistance wire, for example, tungsten wire, molybdenum wire, tungsten wire to which thorium is added may be used.

According to the heat generating portion 9 of the present embodiment, by arranging the resistance lines with a large portion arranged mainly in the vertical direction (y direction) around the second crucible, constant heat generation is possible in the vertical direction, thereby minimizing local accumulation of heat. Thus, heat can be evenly transferred to the second crucible.

FIG. 7B is a view schematically showing another heat generating unit structure which may be employed in the linear evaporation source device of FIG. 1.

Referring to FIG. 7B, the heat generating unit 9a according to the present exemplary embodiment includes a resistance wire 90 installed in a predetermined arrangement on the upper side of the outer circumferential surface of the second crucible or on the outer surface of the upper second crucible. The predetermined arrangement has a longer extension in the y direction than an extension in the x direction as shown in Fig. 7b, and the spacing or density of the resistance wire 90 in the middle portion 95b in the x direction is equal to both ends or the like. It may have a serpentine shape that is smaller than the spacing or density of the resistance wire 90 at the edge portions 95a and 95c.

According to the heat generating portion 9a of the present embodiment, even when the crucible capacity of the heat radiation heating type linear evaporation source device is increased, it is possible to compensate that the temperature of the edge portion is lower than that of the center portion of the crucible. That is, as shown in FIG. 7B, by reducing the density of the central portion of the resistance wire 90, it is possible to maintain an even temperature throughout the apparatus.

8 is a partially exploded perspective view showing a heat radiation heating type linear evaporation source device according to an embodiment of the present invention in three dimensions.

The heat radiation heating type linear evaporation source device according to the present embodiment may be implemented as shown in FIG. 8. Each component of the linear evaporation source device of this embodiment may correspond to the linear evaporation source device shown in FIG. 1 except for the second crucible.

In this embodiment, the lower support 8 may be provided with a bottom plate 13 having a relatively large area to form the bottom surface. By employing the bottom plate 13 made of a metal or alloy material having excellent heat dissipation, the cooling effect of the lower support 8 can be further improved.

Further, the first crucible 5, the upper second crucible 6a, and the lower second crucible 6b are arranged linearly, for example, when the inner space thereof has a line shape when viewed from the upper side to the lower side. In order to correspond to the linear structure, the heat generating unit 9 is also arranged along the outer surface of the upper second crucible 6 in the longitudinal direction of the upper second crucible 6. In addition, the cover 2 disposed on the upper portion of the first crucible 5 has a discharge portion in which the organic source material is discharged is linearly arranged.

In addition, a plate-shaped reflector 10 is arranged along the outer circumferential surfaces of the upper and lower second crucibles 6a and 6b and the heat generating unit 9, and along the upper side of the cover 2 and the upper edge of the reflector 10. Dual thermal cut-offs 4 and 3 are arranged, respectively.

According to the above-described configuration, in the linear evaporation source, the organic material source having low thermal conductivity in the crucible can evaporate from the top of the crucible, thereby minimizing the phenomena of the organic material source and increasing the evaporation rate.

In the above, the configuration of the present invention with reference to the preferred embodiment of the present invention, but the present invention is not limited to the above embodiment, of course, it is within the scope of the present invention as grasped by the appended claims and drawings Various modifications, modifications, and improvements are possible in the art to those skilled in the art.

2 ... cover
3, 4 ...
5.1st crucible
6 ... the second crucible
8.Lower support
9.heating part
10.Reflection board
11 source material
12 ... control part

Claims (12)

A first crucible having a source material stored therein and having an opening at one side;
A second crucible installed outside the first crucible to surround the first crucible;
A heat generating unit for heating the source material by supplying heat to the second crucible; And
A cover partially covering the opening of the first crucible,
The first crucible is a heat radiation heating type linear evaporation source device which is heated by the heat conduction of the second crucible. The method of claim 1,
The second crucible is a heat radiation heating type linear evaporation source device comprising an upper second crucible and a lower second crucible which are detachably coupled to each other. The method of claim 2,
The heat generating unit is a heat radiation heating linear evaporation source device disposed along the outer circumferential surface of the upper second crucible. The method of claim 3,
And a wall thickness of the lower second crucible is thinner than a portion adjacent to the upper second crucible. The method of claim 3,
The heating unit includes a meandering resistance wire, and the density of the resistance wire located on the outer circumferential surface of the second crucible in a direction orthogonal to the direction in which the source material is evaporated and discharged is at an edge of the second crucible at an edge thereof. Larger heat radiation heated linear evaporation source device. The method of claim 3,
And a lower supporter supporting a lower side of the lower second crucible facing the lid and having a higher thermal conductivity than the lid. The method of claim 6,
The cover is a heat radiation heating linear evaporation source device comprising a graphite plate is heated by the heat conduction of the second crucible. The method of claim 7, wherein
And a reflection plate surrounding the first crucible and the second crucible, the heat generating part, the lower supporter, and the cover. The method of claim 8,
And a first heat shield configured to face the cover with the reflector therebetween and block heat dissipation to the cover portion. 10. The method of claim 9,
And a second heat shield arranged on the side facing the heating part with the cover interposed therebetween to block heat emitted to the outside through the cover. The method of claim 1,
The cover has a discharge portion for discharging the source material to the outside of the first crucible, the discharge portion heat radiation heating type linear evaporation source penetrating through the inside of the body of the cover in a zigzag form. The method of claim 1,
And a control unit arranged at an edge of the outlet of the cover through which the source material is evaporated and adjusting the size and direction of the outlet.

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