Patent Publication Number: US-2022238356-A1

Title: Semiconductor device and cleaning system

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     The present application is a continuation of International Patent Application No. PCT/CN2021/111844, filed on Aug. 10, 2021, which is submitted based on Chinese Patent Application No. 202110105673.3, filed on 26 Jan. 2021, and claims priority to the Chinese patent application. The disclosures of International Patent Application No. PCT/CN2021/111844 and Chinese Patent Application No. 202110105673.3 are incorporated herein by reference in their entireties. 
    
    
     BACKGROUND 
     A Chemical Vapor Deposition (CVD) process is widely used in semiconductor processing. Presently, the CVD process is typically performed by a CVD machine. Due to design defects of an original CVD machine, clean gas during the processing is introduced from the top of the CVD machine to realize cleaning of the CVD machine. However, it is difficult for the clean gas to clean a bottom gap of the CVD machine, so that after the CVD machine executes the process flow for a long time, a large amount of impurities are prone to accumulation at the bottom of the machine. 
     The impurities accumulated at the bottom of the machine may be raised in the production process along with the introduction of the process gas, falling on a wafer in which the CVD process is being performed, thereby contaminating the wafer product, and directly causing the product to be scrapped. In addition, the impurities attached to the wafer may continue to contaminate other semiconductor chambers along with continued execution of the process. 
     In order to ensure the deposition environment inside the CVD machine, related personnel would generally manually clean the CVD machine during the maintenance of the CVD machine, to clear the deposition impurities inside the machine. After the CVD machine executes the process flow for a long time, a large amount of impurities are accumulated at the bottom of the machine, so that the maintenance period of the CVD machine is shortened, and the maintenance of the CVD machine consumes a large amount of time, thereby reducing the production efficiency of the wafer product. Therefore, how to complete the cleaning of the bottom gap of the CVD machine without reducing the production efficiency of the product is the problem to be solved at present. 
     SUMMARY 
     The present disclosure relates to the field of semiconductor processing, and in particular, to a semiconductor device and a cleaning system. 
     Embodiments of the present disclosure provide a semiconductor device and a cleaning system. 
     In order to solve the technical problem above, the embodiments of the present disclosure provide a semiconductor device, including: a device chamber, and a supporting column and a bearing platform located in the device chamber, the supporting column being configured to support the bearing platform; and an air outlet, a first air inlet assembly, and a second air inlet assembly provided on the device chamber, the first air inlet assembly and the second air inlet assembly being configured to introduce clean gas into the device chamber, and the air outlet being configured to discharge gas in the device chamber. The first air inlet assembly and the second air inlet assembly are separately provided on the device chamber on the upper and lower sides of a bearing surface of the bearing platform; and one of the first air inlet assembly and the second air inlet assembly is configured to clean the device chamber on a side of the bearing surface away from the supporting column, and other assembly is configured to clean a gap between the supporting column and the device chamber. 
     The embodiments of the present disclosure further provide a cleaning system, in addition to the semiconductor device, further including: an air supply device and an air suction pump, the air supply device being configured to supply clean gas. The air supply device is connected to a first air inlet assembly and a second air inlet assembly of the semiconductor device and is configured to introduce the clean gas into a device chamber of the semiconductor device; and the air suction pump is connected to an air outlet of the semiconductor device and is configured to suction out gas in the device chamber. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       One or more embodiments are described by way of examples with reference to the corresponding figures in the accompanying drawings. Unless otherwise particularly stated, the figures in the accompanying drawings are limited to a scale. 
         FIG. 1  is a schematic structural diagram of a semiconductor device provided by one embodiment of the present disclosure. 
         FIG. 2  is a schematic structural diagram of bottom chamber stretching or contraction provided by one embodiment of the present disclosure. 
         FIG. 3  to  FIG. 6  are schematic structural diagrams of a first air inlet assembly implementation mode provided by one embodiment of the present disclosure. 
         FIG. 7  is a cross-sectional view of separate cleaning pipelines provided by one embodiment of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     Presently, the impurities accumulated at the bottom of the machine may be raised in the production process along with the introduction of the process gas, falling on a wafer in which the CVD process is being performed, thereby contaminating the wafer product, and directly causing the product to be scrapped. 
     In addition, the impurities attached to the wafer may continue to contaminate other semiconductor chambers. 
     In order to ensure the deposition environment inside the CVD machine, related personnel would generally clean the CVD machine during the maintenance of the CVD machine, so as to clear the deposition impurities inside the machine. After the CVD machine executes the process flow for a long time, a large amount of impurities are accumulated at the bottom of the machine, so that the maintenance period of the CVD machine is shortened, and the maintenance of the CVD machine consumes a large amount of time, thereby reducing the production efficiency of the wafer product. 
     In order to solve the problem above, the embodiments of the present disclosure provide a semiconductor device, including: a device chamber, and a supporting column and a bearing platform located in the device chamber, the supporting column being configured to support the bearing platform; and an air outlet, a first air inlet assembly, and a second air inlet assembly provided on the device chamber, the first air inlet assembly and the second air inlet assembly being configured to introduce clean gas into the device chamber, and the air outlet being configured to discharge gas in the device chamber. The first air inlet assembly and the second air inlet assembly are separately provided on the device chamber on the upper and lower sides of a bearing surface of the bearing platform; and one of the first air inlet assembly and the second air inlet assembly is configured to clean the device chamber on a side of the bearing surface away from the supporting column, and other assembly is configured to clean a gap between the supporting column and the device chamber. 
     To describe the purpose, the technical solutions and the advantages of the embodiments of the present disclosure more clearly, the embodiments of the present disclosure are described in details below in conjunction with the accompanying drawings. However, persons skilled in the art would understand that in the embodiments of the present disclosure, a number of technical details are described in the following description for readers to better understand the present disclosure. However, the technical solutions of the present disclosure may also be implemented even if in the absence of the technical details and various changes and modifications based on the following embodiments. A division of the following embodiments is for convenience of description, and should not constitute any limitation to specific implementations of the present disclosure, and various embodiments may be combined and referenced with each other without contradiction. 
       FIG. 1  is a schematic structural diagram of a semiconductor device provided by this embodiment.  FIG. 2  is a schematic structural diagram of bottom chamber stretching or contraction provided by this embodiment.  FIG. 3  to  FIG. 6  are schematic structural diagrams of a first air inlet assembly implementation mode provided by this embodiment.  FIG. 7  is a cross-sectional view of separate cleaning pipelines provided by this embodiment. The semiconductor device provided by this embodiment is descried in details below in conjunction with the accompanying drawings. Specific details are as follows. 
     Referring to  FIG. 1 , the semiconductor device includes: a device chamber  100 , and a supporting column  101  and a bearing platform  102  located in the device chamber  100 . The supporting column  101  is configured to support the bearing platform  102 . 
     In this embodiment, the device chamber  100  includes a top chamber  110  and a bottom chamber  120 , and the width of the top chamber  110  is greater than that of the bottom chamber  120  in a plane parallel to the bearing surface. The bearing platform  102  is located in the top chamber  110 , the supporting column  101  is partially located in the top chamber  110  and partially located in the bottom chamber  120 , and the size of the supporting column  101  is less than that of the bearing platform  102  in a plane parallel to the bearing surface. 
     It is to be noted that the top chamber  110  and the bottom chamber  120  provided by this embodiment are merely illustrative of the device chamber and do not constitute a limitation to the device chamber  100 . In other embodiments, the device chamber may be a single chamber. In addition, the width limitation of the top chamber  110  and the bottom chamber  120  in this embodiment is merely illustrative of the device chamber  100 , and does not constitute a limitation to the top chamber  110  and the bottom chamber  120 . In other embodiments, this embodiment is also applicable to the device chamber having a bottom chamber width greater than or equal to a top chamber width. 
     The bearing platform  102  is provided with a bearing assembly  112  which is configured to bear a wafer placed on the bearing platform  102 , and the semiconductor device is configured to perform related processes on the wafer placed on the bearing platform  102 . 
     The semiconductor device further includes: an air outlet  103 , a first air inlet assembly  113 , and a second air inlet assembly  104  provided on the device chamber  100 . The first air inlet assembly  113  and the second air inlet assembly  104  are configured to introduce clean gas into the device chamber  100 , and the air outlet  103  is configured to discharge gas in the device chamber  100 . 
     Specifically, the first air inlet assembly  113  and the second air inlet assembly  104  are respectively provided on the device chamber  100  on the upper and lower sides of a bearing surface of the bearing platform  102 . One of the first air inlet assembly  113  and the second air inlet assembly  104  is configured to clean the device chamber  100  on the side of the bearing surface away from the supporting column  101 , and other assembly is configured to clean a gap between the supporting column  101  and the device chamber  100 . The first air inlet assembly  113  or the second air inlet assembly  104  for cleaning the gap between the supporting column  101  and the device chamber  100  is further configured to clean the bottom of the top chamber  110 . 
     In this embodiment, the first air inlet assembly  113  is provided at the bottom of the bottom chamber  120 , and the second air inlet assembly  104  is provided at the top of the top chamber  110 . The first air inlet assembly  113  and the air outlet  103  form a first airflow circulation, the second air inlet assembly  104  and the air outlet  103  form a second airflow circulation, and the first airflow circulation and the second airflow circulation are configured to clean the device chamber  100  on the upper and lower sides of the bearing surface respectively, thereby realizing simultaneous removal of top contamination and bottom contamination of the device chamber  100 . It is to be noted that, in other embodiments, the first air inlet assembly may be provided at the top of the top chamber, and the second air inlet assembly may be provided at the bottom of the bottom chamber. The specific positions of the first air inlet assembly  113  and the second air inlet assembly  104  provided by this embodiment are merely illustrative of the semiconductor device provided by this embodiment and do not constitute a limitation to the semiconductor device. 
     Specifically, the first air inlet assembly  113  includes through holes  123  provided between the supporting column  101  and the device chamber  100 , and the through holes  123  are configured to discharge the clean gas in the first air inlet assembly  113 . 
     Referring to  FIG. 3  and  FIG. 4 , in an example, the first air inlet assembly  113  includes a cleaning pipe  201  nested on the supporting column  101 . The cleaning pipe  201  has a plurality of separate through holes  123 , and the through holes  123  are configured to discharge the clean gas in the cleaning pipe  201 . 
     Specifically, the spacing between the through holes  123  is 10-20 mm, e.g., 12 mm, 15 mm, or 18 mm. In this embodiment, the spacing between the through holes  123  is 15 mm. When the spacing between the through holes  123  is greater than 20 mm, the number of the through holes  123  located on the cleaning pipe  201  is reduced. Since the through holes  123  serve as air outlet holes of the cleaning pipe  201 , the air outlet area of the cleaning pipe  201  is reduced. When the introduction flow rate of the clean gas is constant, the area of the through holes  123  corresponding to the bottom chamber  120  is small, and the overall cleaning effect of the bottom chamber  120  is poor. When the spacing between the through holes  123  is less than 10 mm, the number of the through holes  123  located on the cleaning pipe  201  is increased. Since the through holes  123  serve as air outlet holes of the cleaning pipe  201 , the air outlet area of the cleaning pipe  201  is increased. When the introduction flow rate of the clean gas is constant, the air outlet flow rate of the through holes  123  is small, and the cleaning effect of the chamber wall of the bottom chamber  120  corresponding to the through holes  123  is poor. 
     In addition, the width of each through hole  123  is 3-7 mm, e.g., 3 mm, 4 mm, or 5 mm. In this embodiment, the width of each through hole  123  is 5 mm. When the width of each through hole  123  is greater than 7 mm, and the introduction flow rate of the clean gas is constant, the air outlet flow rate of the through holes  123  is small, and the cleaning effect of the chamber wall of the bottom chamber  120  corresponding to the through holes  123  is poor. When the width of each through hole  123  is less than 3 mm, and the introduction flow rate of the clean gas is constant, the area of the through hole  123  corresponding to the bottom chamber  120  is small, and the overall cleaning effect of the bottom chamber  120  is poor. 
     In addition, in a direction perpendicular to the bearing surface, the height difference between the through hole  123  at the highest position and the bearing surface is 3-10 mm, e.g., 5 mm, 7 mm, or 9 mm. The through hole  123  at the highest position is close to the bearing surface, thereby ensuring the chamber effect of the device chamber  100  below the bearing surface. 
     In this embodiment, the density of the through holes  123  on the cleaning pipe  201  close to the bearing platform  102  is greater than that of the through holes  123  on the cleaning pipe  201  away from the bearing platform  102 . That is, the number of the through holes  123  on the cleaning pipe  201  at the bottom of the bottom chamber  120  is small, and the number of the through holes  123  on the cleaning pipe  201  at the top of the bottom chamber  120  is large. Such arrangement of the through holes  123  improves the cleaning efficiency of the clean gas on the bottom of the bottom chamber  120 . In addition, a larger number of through holes  123  on the cleaning pipe  201  at the top of the bottom chamber  120  improve the cleaning efficiency of impurities accumulated at the connection surface of the bottom chamber  120  and the top chamber  110 . 
     In other embodiments, the density of the through holes on the cleaning pipe close to the bearing platform is greater than that of the through holes in the middle of the cleaning pipe, and the density of the through holes on the cleaning pipe away from the bearing platform is greater than that of the through holes in the middle of the cleaning pipe. That is, the density of the through holes in both ends of the cleaning pipe is greater than that of the through holes in the middle of the cleaning pipe. Such arrangement of the through holes improves the cleaning efficiency of the clean gas on the bottom of the top chamber and the bottom of the bottom chamber. 
     Referring to  FIG. 3 , in one specific implementation, the cleaning pipe  201  includes an outer pipe wall  211  and an inner pipe wall  221 . The width of the outer pipe wall  211  is greater than that of the inner pipe wall  221  in a plane parallel to the bearing surface. The inner pipe wall  221  is provided on the outer wall of the supporting column  101 , and the outer pipe wall  211  and the supporting column  101  are provided in a nested mode. The through holes  123  are located on the outer pipe wall. The space enclosed by the outer pipe wall  211  and the inner pipe wall  221  is a cleaning pipeline of the cleaning pipe  201 , the clean gas is introduced from an end of the cleaning pipe  201  away from the bearing surface, and the clean gas is leaded out from the through holes  123  for cleaning the chamber wall of the bottom chamber  120 . 
     More specifically, in this implementation, the height of the through hole  123  at the highest position is greater than that of the contact surface of the top chamber  110  and the bottom chamber  120 , that is, in the direction perpendicular to the bearing surface, the height difference between the through hole  123  at the highest position and the bearing surface is 3-10 mm. In practical application, the height difference between the through hole  123  and the bearing surface is specifically set according to the height difference between the bearing surface and the contact surface of the top chamber  110  and the bottom chamber  120 , thereby ensuring that the through hole  123  at the highest position has a good cleaning effect on impurities accumulated at the bottom of the top chamber  110 . 
     Referring to  FIG. 4 , in another specific implementation, in a plane parallel to the bearing surface, the width of the cleaning pipe  201  is greater than that of the supporting column  101 , the cleaning pipe  201  and the supporting column  101  enclose a cleaning pipeline of the cleaning pipe  201 , and the through holes  123  are located on the cleaning pipe  201 . The clean gas is introduced from an end of the cleaning pipe  201  away from the bearing surface, and the clean gas is leaded out from the through holes  123  for cleaning the chamber wall of the bottom chamber  120 . 
     More specifically, in this implementation, the density of the through holes  123  on the cleaning pipe  201  close to the bearing platform  102  is greater than that of the through holes  123  on the cleaning pipe  201  away from the bearing platform  102 . That is, the number of the through holes  123  on the cleaning pipe  201  at the bottom of the bottom chamber  120  is small, and the number of the through holes  123  on the cleaning pipe  201  at the top of the bottom chamber  120  is large. Such arrangement of the through holes  123  improves the cleaning efficiency of the clean gas on the top of the bottom chamber  120 . 
     Referring to  FIG. 5 , in another example, the first air inlet assembly  113  includes a cleaning pipeline  401  spirally provided around the supporting column  101 . The cleaning pipeline  401  has a plurality of separate through holes  123 , and the through holes  123  are located on one side of the cleaning pipeline  401  close to the device chamber  100  and configured to discharge the clean gas in the cleaning pipeline  401 . 
     In this implementation, the width of each through hole  123  and the spacing between the through holes  123  may be the same as those of the foregoing implementation, and will not be further described in this implementation. In addition, the spiral manner shown in  FIG. 5  does not constitute a limitation to this embodiment, and in other embodiments, the cleaning pipe may be spirally arranged at a certain distance around the supporting column. Persons skilled in the art understand that, if there is no special effect, the cleaning pipeline  401  spirally provided around the supporting column  101  shall fall within the scope of protection of this implementation. 
     Referring to  FIG. 6  and  FIG. 7 , in another yet example, the first air inlet assembly  113  includes a plurality of spirally provided separate cleaning pipelines  501  at a gap between the supporting column  101  and the device chamber  100 . The position distribution of the cleaning pipelines  501  and the supporting column  101  is shown in  FIG. 7 . Referring to  FIG. 6 , each cleaning pipeline  501  has a plurality of separate through holes  123 , and the through holes are located on one side of the cleaning pipelines  501  close to the device chamber  100  and configured to discharge the clean gas in the cleaning pipelines  501 . 
     In this implementation, the width of each through hole  123  and the spacing between the through holes  123  may be the same as those of the foregoing implementation, and will not be further described in this implementation. In addition, the position distribution of the cleaning pipelines  501  and the supporting column  101  shown in  FIG. 7  is merely illustrative of this implementation, and in other embodiments, the cleaning pipelines may be arranged between the device chamber and the supporting column more densely or more loosely. 
     Referring to  FIG. 1 , in this embodiment, the chamber wall of the bottom chamber  120  is a first telescopic structure. The first telescopic structure is connected to a control motor, and the control motor is configured to control the first telescopic structure to be elongated or shortened. Referring to  FIG. 2 , specifically, the control motor stretches or extrudes the first telescopic structure in a direction perpendicular to the bearing surface, so that the first telescopic structure is elongated or shortened in the direction perpendicular to the bearing surface. More specifically, the control motor stretches the first telescopic structure in the direction perpendicular to the bearing surface, and the first telescopic structure is elongated in the direction perpendicular to the bearing surface; and the control motor extrudes the first telescopic structure in the direction perpendicular to the bearing surface, and the first telescopic structure is shortened in the direction perpendicular to the bearing surface. 
     Also with reference to  FIG. 1 , the bottom chamber  120  is the first telescopic structure. By controlling the stretching or shortening of the first telescopic structure to change the positions of the supporting column  101  and the bearing platform  102  relative to the device chamber  100 , originally hidden corners in the device chamber  100  are exposed, and the clean gas dynamically cleans the device chamber  100 , thereby improving the cleaning effect on the device chamber  100 . 
     Specifically, in the process of introducing the clean gas into the device chamber  100  by the first air inlet assembly  113  and the second air inlet assembly  104 , by controlling the stretching or shortening of the first telescopic structure to change the positions of the supporting column  101  and the bearing platform  102  relative to the device chamber  100 , all positions of the device chamber  100  are exposed in the clean gas, and the clean gas dynamically cleans the device chamber  100 , thereby improving the cleaning effect on the device chamber  100 . 
     In an example, the first telescopic structure is a corrugated pipe. It is to be noted that the corrugated pipe serves as the chamber wall of the bottom chamber  120  to realize expansion/contraction of the bottom chamber, which does not constitute a limitation to this embodiment. In other embodiments, the chamber wall of the bottom chamber may be made of an elastic material, thereby achieving expansion/contraction of the bottom chamber. 
     In this embodiment, an air inlet pipeline of the first air inlet assembly  113  is further included, and the air inlet pipeline is configured to convey the clean gas into the first air inlet assembly  113 . 
     Referring to  FIG. 1 , the air inlet pipeline is provided with a second telescopic structure  133 , and the first telescopic structure is elongated or shortened to drive the second telescopic structure  133  to be elongated or shortened. Specifically, the second telescopic structure  133  is also connected to the control motor, and the control motor is configured to control the second telescopic structure  133  to be elongated or shortened. Specifically, the control motor stretches or extrudes the second telescopic structure  133  in the direction perpendicular to the bearing surface to enable the second telescopic structure  133  to be elongated or shortened in the direction perpendicular to the bearing surface. More specifically, when the first telescopic structure is elongated, the control motor stretches the second telescopic structure  133  in the direction perpendicular to the bearing surface, and the second telescopic structure is elongated in the direction perpendicular to the bearing surface; and when the first telescopic structure is shortened, the control motor extrudes the second telescopic structure  133  in the direction perpendicular to the bearing surface, and the second telescopic structure  133  is shortened in the direction perpendicular to the bearing surface. Through the second telescopic structure  133 , the air inlet pipeline may be stretched along with stretching of the bottom chamber  120 , and extruded along with extrusion of the bottom chamber  120 , so that the stability of the first air inlet assembly  113  and the air inlet pipeline is ensured. 
     In an example, the second telescopic structure  133  is a corrugated pipe. It is to be noted that the corrugated pipe serves as the second telescopic structure to realize the stability of the air inlet pipeline and the first air inlet assembly  113 , which does not constitute a limitation to this embodiment. In other embodiments, the second telescopic structure may be made of an elastic material, thereby achieving expansion/contraction of the second telescopic structure. 
     In addition, in this embodiment, the second telescopic structure  133  is made of aluminum. Since aluminum is a common metal and is easy to obtain, and aluminum has low density, thereby reducing the weight of the air inlet pipeline and avoiding the falling of the air inlet pipeline and the first air inlet assembly  113 . In other embodiments, the second telescopic structure may also be made of gallium alloy. 
     In addition, in this embodiment, the second telescopic structure  133  is connected to the air inlet pipeline through a vacuum connection radial sealing joint. Through connection of the vacuum connection radial sealing structure, the clean gas is prevented from leakage during conveying to the first air inlet assembly  113 , thereby saving the cleaning costs. 
     Compared with the related art, the device chamber on the upper and lower sides of the bearing surface is respectively provided with the first air inlet assembly and the second air inlet assembly. The first air inlet assembly and the air outlet form a first airflow circulation, the second air inlet assembly and the air outlet form a second airflow circulation, and the first airflow circulation and the second airflow circulation are configured to clean the device chamber on the upper and lower sides of the bearing surface respectively, thereby realizing simultaneous removal of top contamination and bottom contamination of the device chamber, i.e., completing the cleaning of the bottom gap of the machine without stopping the machine, so that the production efficiency of the product is not reduced. 
     Another embodiment of the present disclosure relates to a cleaning system, in addition to the semiconductor device, further including: an air supply device and an air suction pump, the air supply device being configured to supply clean gas. The air supply device is connected to a first air inlet assembly and a second air inlet assembly of the semiconductor device and is configured to introduce the clean gas into the device chamber of the semiconductor device; and an air suction pump is connected to an air outlet of the semiconductor device and is configured to suction out gas in the device chamber. 
       FIG. 1  is a schematic structural diagram of the semiconductor device. The cleaning system provided by this embodiment is described in details in conjunction with the accompanying drawings. Parts which are the same as the forgoing embodiments are not described in detail in this embodiment. 
     The cleaning system includes: the semiconductor device provided by the forgoing embodiments (referring to FIG,  1 ), the air supply device, and the air suction pump, the air supply device being configured to supply clean gas. The air supply device is connected to the first air inlet assembly  113  and the second air inlet assembly  104  of the semiconductor device and configured to introduce clean gas into the device chamber  100  of the semiconductor device. The air suction pump is connected to the air outlet  103  of the semiconductor device and configured to suction out the gas in the device chamber  100 . The air supply device is connected to the first air inlet assembly  113  and the second air inlet assembly  104 , and the air suction pump is connected to the air outlet  103 , so that the clean gas supplied by the air supply device forms a first airflow circulation between the first air inlet assembly  113  and the air outlet  103 , and forms a second airflow circulation between the second air inlet assembly  104  and the air outlet  103 . The first airflow circulation and the second airflow circulation are configured to clean the device chamber  100  on the upper and lower sides of the bearing surface respectively, thereby realizing simultaneous removal of top contamination and bottom contamination of the device chamber  100 . 
     In this embodiment, the clean gas includes Ar plasma and NF 3  plasma. Specifically, the contaminant impurities accumulated in the device chamber  100  are mainly SiO 2  or Si x N y . The Ar plasma introduced into the device chamber  100  bombards the impurities, causing the impurities attached to the device chamber  100  to fall off. The NF 3  plasma introduced into the device chamber  100  reacts with the impurities. The reaction equations are as follows: 
       F − +SiO 2 →SiF 4  (gas)+gas by-product   (1)
 
       F − +Si x N y →SiF 4  (gas)+gas by-product   (2)
 
     The NF 3  plasma introduced into the device chamber  100  and the falling solid impurities may undergo a chemical reaction, the solid impurities are converted into gaseous impurities, and the gaseous impurities are suctioned from the air outlet  103  of the device chamber  100 , thereby completing the cleaning of the contaminant impurities accumulated in the device chamber  100 . 
     It is to be noted that the clean gas is Ar plasma and NF 3  plasma, which does not constitute a limitation to this embodiment, except for the purpose of illustrating the clean gas being a component of the plasma, and how to implement a cleaning process for impurities accumulated in the device chamber  100 . In other embodiments, the specific components of the plasma may be selected according to the components of the contaminant impurities in the device chamber. 
     In addition, in this embodiment, the cleaning system further includes a control motor, connected to the first telescopic structure and configured to stretch or extrude the first telescopic structure in a direction perpendicular to the bearing surface, so that the first telescopic structure is elongated or shortened in the direction perpendicular to the bearing surface. 
     Specifically, the control motor stretches or extrudes the first telescopic structure in the direction perpendicular to the bearing surface, so that the first telescopic structure is elongated or shortened in the direction perpendicular to the bearing surface. More specifically, the control motor stretches the first telescopic structure in the direction perpendicular to the bearing surface, and the first telescopic structure is elongated in the direction perpendicular to the bearing surface; and the control motor extrudes the first telescopic structure in the direction perpendicular to the bearing surface, and the first telescopic structure is shortened in the direction perpendicular to the bearing surface. The control motor controls the stretching or shortening of the first telescopic structure to change the positions of the supporting column  101  and the bearing platform  102  relative to the device chamber  100 , so that originally hidden corners in the device chamber  100  are exposed, and the clean gas dynamically cleans the device chamber  100 , thereby improving the cleaning effect on the device chamber  100 . 
     Compared with the related art, the air supply device is connected to the first air inlet assembly and the second air inlet assembly, and the air suction pump is connected to the air outlet, so that the clean gas supplied by the air supply device forms a first airflow circulation between the first air inlet assembly and the air outlet, and forms a second airflow circulation between the second air inlet assembly and the air outlet; and the first airflow circulation and the second airflow circulation are configured to clean the device chamber on the upper and lower sides of the bearing surface respectively, thereby realizing simultaneous removal of top contamination and bottom contamination of the device chamber, i.e., completing the cleaning of the bottom gap of the machine without stopping the machine, so that the production efficiency of the product is not reduced. 
     Compared with the related art, the device chamber on the upper and lower sides of the bearing surface is respectively provided with the first air inlet assembly and the second air inlet assembly. The first air inlet assembly and the air outlet form a first airflow circulation, the second air inlet assembly and the air outlet form a second airflow circulation, and the first airflow circulation and the second airflow circulation are configured to clean the device chamber on the upper and lower sides of the bearing surface respectively, thereby realizing simultaneous removal of top contamination and bottom contamination of the device chamber, i.e., completing the cleaning of the bottom gap of the machine without stopping the machine, so that the production efficiency of the product is not reduced. 
     Compared with the related art, the air supply device is connected to the first air inlet assembly and the second air inlet assembly, and the air suction pump is connected to the air outlet, so that the clean gas supplied by the air supply device forms a first airflow circulation between the first air inlet assembly and the air outlet, and forms a second airflow circulation between the second air inlet assembly and the air outlet; and the first airflow circulation and the second airflow circulation are configured to clean the device chamber on the upper and lower sides of the bearing surface respectively, thereby realizing simultaneous removal of top contamination and bottom contamination of the device chamber, i.e., completing the cleaning of the bottom gap of the machine without stopping the machine, so that the production efficiency of the product is not reduced. 
     Since the forgoing embodiments correspond to this embodiment, this embodiment may be implemented in conjunction with the forgoing embodiments. The relevant technical details mentioned in the forgoing embodiments are still valid in this embodiment. The technical effects that can be achieved in the forgoing embodiments may also be implemented as well in this embodiment. In order to reduce repetition, the description is not repeated here. Accordingly, the relevant technical details mentioned in this embodiment can also be applied to the forgoing embodiments. 
     Those skilled in the art can understand that the forgoing embodiments are specific embodiments for implementing the present disclosure. However, in practical application, various changes may be made in form and detail without departing from the spirit and scope of the present disclosure.