Mask and printing device

Abstract

The utility model relates to the technical field of solar cell manufacturing devices, and discloses a mask and a printing device, which are used for manufacturing graphical solar cells. The silk screen is arranged in the mask frame, the silk screen comprises a silk screen framework and a plurality of hollow grids separated by the silk screen framework, and the silk screen framework is connected with the mask frame; and the silk screen framework is configured to be close to or in contact with the solar cell. The mask can effectively reduce the probability of hidden cracks and fragments of the solar cell, ensure the exposure effect and improve the yield of the solar cell.

Description

Technical Field

[0001] This utility model relates to the technical field of solar cell manufacturing equipment, and in particular to a photomask and printing device. Background Technology

[0002] In the fabrication process of copper interconnect technology, the printing process is a key step in forming electrode areas and non-electrode areas. Specifically, when the printing light source exposes the solar cell through a mask, the patterned area on the mask can prevent the printing light source from shining on the surface of the solar cell. Therefore, the patterned area is used to form the electrode area of ​​the solar cell, and the area through which the light source passes is used to form the non-electrode area of ​​the solar cell.

[0003] However, during the exposure process, the photomask easily attracts foreign objects such as dust and debris from the solar cells, which not only reduces the exposure effect but also increases the risk of microcracks and breakage of the solar cells, resulting in a decrease in the yield of the solar cells. Utility Model Content

[0004] This utility model discloses a photomask and a printing device. The photomask can effectively reduce the probability of microcracks and fragments in solar cells, ensure the exposure effect, and improve the yield of solar cells.

[0005] In a first aspect, embodiments of this application disclose a photomask for fabricating patterned solar cells, the photomask comprising:

[0006] Mask frame;

[0007] A screen, the screen being disposed within the mask frame, the screen including a screen skeleton and a plurality of open grids separated by the screen skeleton, the screen skeleton being connected to the mask frame;

[0008] The wire mesh frame is configured to be close to or in contact with the solar cell.

[0009] Furthermore, the thickness of the wire mesh skeleton is 50μm to 100μm; and / or,

[0010] The wire mesh skeleton is made of metal wire, and the material of the metal wire includes at least one of silver, tungsten steel wire, and brushed black titanium.

[0011] Furthermore, the wire mesh also includes a protective layer that wraps around the outer surface of the wire mesh skeleton.

[0012] Furthermore, the thickness of the protective layer is 5μm to 10μm.

[0013] Furthermore, when the wire mesh frame is configured close to the solar cell, the distance between the wire mesh frame and the solar cell is 40μm to 50μm.

[0014] Further, the wire mesh skeleton includes a plurality of first filamentary structures extending along a first direction and a plurality of second filamentary structures extending along a second direction, the first direction intersecting the second direction, the first filamentary structures and the second filamentary structures serving to separate and form the perforated mesh; and / or,

[0015] The wire mesh skeleton includes several parallel first filament structures, which are used to separate and form the hollowed-out mesh.

[0016] Furthermore, the mask frame includes an outer frame and a connecting plate connected to the outer frame, and the wire mesh skeleton is connected to the connecting plate.

[0017] Secondly, embodiments of this application disclose a printing apparatus, the printing apparatus comprising:

[0018] Printing light source;

[0019] A support platform is disposed below the photomask and is used to place the solar cell.

[0020] The photomask as described in any of the first aspects is disposed between the printing light source and the carrier platform;

[0021] When the solar cell is placed on the support platform, the wire mesh frame is used to block the printing light source from shining on the solar cell, and the hollowed-out mesh is used to allow the printing light source to shine on the solar cell.

[0022] Furthermore, the printing device also includes a fixed bracket and a blowing structure disposed on the fixed bracket. The blowing structure is disposed on the mask or close to the mask, and the blowing structure is disposed away from the printing light source. The blowing structure is used to blow away the screen.

[0023] Furthermore, the mask frame is provided with positioning points, and the printing device further includes a correction structure, the correction structure comprising:

[0024] A position detection device, used to detect the position of the solar cell placed on the support platform and the position of the positioning point on the mask frame;

[0025] A corrector is electrically connected to the position detection element. The corrector is used to correct the position of the solar cell on the support platform so that the electrode area of ​​the corrected solar cell corresponds to the position of the wire mesh skeleton in the photomask.

[0026] Furthermore, the printing apparatus also includes a storage box for storing the photomask; and / or,

[0027] The support platform is provided with vacuum suction holes, which are distributed on the surface of the support platform. These vacuum suction holes are used to fix the position of the solar cell on the support platform; and / or...

[0028] The printing apparatus further includes a lifting assembly connected to the support platform, the lifting assembly being used to drive the support platform to move up and down relative to the photomask; and / or,

[0029] The printing device further includes a mounting bracket for placing the photomask, and a positioning element is provided on the mounting bracket for fixing the photomask in the position of the mounting bracket.

[0030] Compared with the prior art, the beneficial effects of this application include:

[0031] This application provides a photomask and printing apparatus for patterning solar cells. The photomask can effectively reduce the probability of microcracks and fragments in solar cells, ensure the exposure effect, and improve the yield of solar cells.

[0032] Unlike existing technologies that use glass plates as substrates for solar cell grid lines, this application's photomask does not use a glass plate. Instead, it employs a photomask frame and a screen mesh structure. The photomask frame houses the screen mesh, providing structural support and protection. The screen mesh includes a mesh skeleton and several perforated grids separated by the skeleton. This not only allows the mesh skeleton to block light from passing through while the perforated grids allow light to pass through, enabling patterned fabrication of the solar cell, but more importantly, by eliminating the flat glass plate, only the mesh skeleton easily contacts the solar cell when it is near or in contact with it. The perforated grids further reduce the contact area between the mesh and the solar cell. This reduces the likelihood of dust, debris, and other foreign matter adhering to the mesh and also avoids microcracks and fragments, thus improving the yield rate of the solar cell. Furthermore, by eliminating the influence of the glass plate on the propagation direction of the printing light source, the printing light source can directly pass through the perforated grid and illuminate the solar cell. Therefore, this mask structure can also effectively improve the effect of the printing light source illuminating the solar cell, resulting in a higher exposure effect in this area and ensuring the fabrication effect of subsequent electrodes. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 This is a schematic diagram of the structure of the mask provided in this application;

[0035] Figure 2 This is a schematic diagram of the structure of a photomask provided in an embodiment of this application;

[0036] Figure 3 This is provided by the embodiments of this application. Figure 2 Top view of the central mask;

[0037] Figure 4 This is provided by the embodiments of this application. Figure 3 Enlarged view of A in the middle;

[0038] Figure 5 This is a top view of another mask provided in the embodiments of this application;

[0039] Figure 6 This is provided by the embodiments of this application. Figure 5 Enlarged view of B in the middle;

[0040] Figure 7 This is a side view of a single wire mesh skeleton and protective layer provided in an embodiment of this application;

[0041] Figure 8 This is a schematic diagram of the printing apparatus provided in the embodiments of this application;

[0042] Figure 9 This is a schematic diagram of the photomask, solar cell, and support platform provided in the embodiments of this application;

[0043] Figure 10 This is a schematic diagram of the printing device (including the blowing structure) provided in the embodiments of this application.

[0044] Icons: 100, Mask; 1a, Glass plate; 1b, Texture; 11, Mask frame; 111, Outer frame; 112, Connecting plate; 113, Positioning point; 12, Silk screen; 121, Silk screen skeleton; 1211, First filamentary structure; 1212, Second filamentary structure; 122, Hollowed-out mesh; 13, Protective layer; 200, Printing light source; 300, Support platform; 400, Solar cell; 500, Fixing bracket; 600, Blowing structure; 700, Lifting assembly. Detailed Implementation

[0045] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0046] In this invention, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this invention and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0047] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this utility model according to the specific circumstances.

[0048] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, elements, or components (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.

[0049] The technical solution provided by this utility model will be further described below with reference to the embodiments and accompanying drawings.

[0050] The fabrication process of copper interconnect technology includes steps such as coating, printing, developing, edge banding, and electroplating. The printing step involves exposing the coated solar cell with a photosensitive emulsion film to light, altering the properties of the photosensitive emulsion. A patterned mask is then used to block the light source, causing the properties of the photosensitive emulsion in the unshielded areas to change upon exposure to light, while the shape of the photosensitive emulsion in the shaded areas remains unchanged. Therefore, the subsequent developing step washes away the photosensitive emulsion that has not undergone this alteration, exposing the seed layer and creating grooves for electrode fabrication, thus achieving the patterned fabrication of the solar cell.

[0051] However, in the actual process, some foreign particles, including debris and dust particles, will be attached to the surface of the solar cell. During the exposure process, the dust particles on the surface of the solar cell can easily stick to the photomask, interfering with the illumination of the printing light source, resulting in subsequent batch printing contamination, and may also cause microcracks and fragments in the solar cell.

[0052] Among them, see Figure 1 As shown, Figure 1 This is a schematic diagram of an existing photomask. The existing photomask 100 includes a glass plate 1a and textures 1b drawn on the glass plate 1a using an opaque material such as cadmium. The textures 1b correspond to the electrode areas of the solar cell. Therefore, during solar cell exposure, due to the large contact area between the solar cell and the photomask 100, foreign particles on the solar cell surface tend to adhere to the textures 1b and the glass plate 1a to a high degree, resulting in a large number of foreign particles on the photomask 100 and affecting the exposure effect. Furthermore, when foreign particles are adsorbed on the photomask 100, these particles come into contact with the solar cell, causing greater stress at the contact points, which can lead to cracks in the solar cell and increase the risk of microcracks. Moreover, as the printing light source passes through the glass plate 1a to irradiate the non-electrode areas of the solar cell, the glass plate 1a affects the propagation direction of the printing light source, thus adversely affecting the exposure effect and the quality of the resulting electrodes.

[0053] Based on the above problems, this application provides a photomask that can effectively reduce the probability of microcracks and fragments in solar cells, ensure the exposure effect, and improve the yield of solar cells.

[0054] The first aspect, such as Figures 2 to 3 As shown, this application discloses a photomask 100 for fabricating patterned solar cells. The photomask 100 includes:

[0055] Mask frame 11;

[0056] The screen 12 is disposed inside the mask frame 11. The screen 12 includes a screen skeleton 121 and a plurality of open grids 122 separated by the screen skeleton 121. The screen skeleton 121 is connected to the mask frame 11.

[0057] The wire mesh frame 121 is configured to be close to or in contact with the solar cell.

[0058] In this application, the screen 12 in the mask 100 is disposed within the mask frame 11. Therefore, the mask frame 11 can provide support for the screen 12, enabling the screen 12 to stably maintain a specific position and shape, ensuring that the screen 12 will not deform, thereby guaranteeing the accuracy of exposure. In addition, compared with the mask 100 in the prior art, the mask frame 11 in this application has a smaller impact on the screen 12. Specifically, when the glass plate 1a in the prior art is broken by external force, it may directly damage the structure of the texture 1b, causing the printing light source to directly irradiate the electrode area of ​​the solar cell, thereby seriously affecting the use effect of the mask 100. However, the mask frame 11 in this application only serves as a carrier for the screen 12. Therefore, when the mask frame 11 is broken by external force, it will not directly cause damage to the screen 12, and the impact on the screen 12 is smaller.

[0059] Furthermore, the screen 12 includes a screen skeleton 121 and a plurality of perforated grids 122 separated by the screen skeleton 121. In this application, the screen skeleton 121 corresponds to the grid pattern of the electrode area of ​​the solar cell, and the perforated grids 122 correspond to the non-electrode areas of the solar cell. Therefore, the screen skeleton 121 blocks the printing light source, ensuring that the material shape of the electrode area remains unchanged. The perforated grids 122 are arranged to be continuous in the direction of the printing light source, allowing the printing light source to directly irradiate the solar cell, avoiding changes in the propagation path of the printing light source, and ensuring that the material shape of the non-electrode areas does not change. Thus, the cooperation between the screen skeleton 121 and the perforated grids 122 helps to ensure the electrode fabrication effect.

[0060] Furthermore, since the perforated mesh 122 is arranged through the direction of the printing light source, foreign particles will not be adsorbed on the perforated mesh 122. Therefore, the presence of the perforated mesh 122 helps to reduce the contact area between the screen 12 and the solar cell, thereby reducing the probability of foreign particles such as dust and debris on the solar cell adsorbing onto the screen 12, avoiding the obstruction of the light source in the non-electrode area by foreign particles, reducing the chance of the solar cell coming into contact with foreign particles, and thus helping to improve the yield and exposure effect of the solar cell.

[0061] In summary, the photomask 100 provided in this application can effectively reduce the probability of microcracks and fragments in solar cells, ensure the exposure effect, and improve the yield of solar cells.

[0062] The design structure of the wire mesh frame 121 corresponds to the grid pattern of the solar cell electrodes, and the shape and size of the perforated mesh 122 are related to the specific arrangement of the wire mesh frame 121. In an optional embodiment, such as... Figure 3 and Figure 4As shown, the wire mesh frame includes a plurality of first filamentary structures 1211 extending along a first direction and a plurality of second filamentary structures 1212 extending along a second direction, and the first direction intersects the second direction, that is, the first filamentary structures 1211 and the second filamentary structures 1212 intersect, indicating that the grid lines of the solar cell include a main grid and a sub-grid connected to the main grid. At this time, the first filamentary structure 1211 corresponds to the sub-grid and the second filamentary structure 1212 corresponds to the main grid. Furthermore, the first filamentary structure 1211 and the second filamentary structure 1212 connected to the first filamentary structure 1211 divide the wire mesh 12 into a plurality of open grids 122.

[0063] The intersection of the first and second directions means that the first and second directions have a point of intersection in space. For example, the angle between the intersection of the first and second directions is a right angle, or the angle between the intersection of the first and second directions is an acute angle.

[0064] In another alternative implementation, such as Figure 5 and Figure 6 As shown, when the wire mesh frame 121 includes several parallel first filament structures 1211, it indicates that the grid lines of the solar cell only include sub-grids. At this time, the first filament structure 1211 corresponds to the sub-grid of the solar cell, and the first filament structure 1211 divides the wire mesh 12 into several open grids 122.

[0065] Furthermore, the thickness of the screen mesh skeleton 121 is 50μm to 100μm. Compared to the existing mask 100 structure (i.e., including the glass plate and the texture on the glass plate), the existing technology uses the glass plate 1a to improve the structural strength of the mask 100, but this affects the exposure effect and reduces the yield of solar cells. Therefore, this application designs the thickness of the screen mesh skeleton 121 and utilizes the structural support of the mask frame 11 to effectively improve the structural strength of the mask 100, avoid deformation and other problems, and improve the service life of the mask 100.

[0066] The thickness of the screen frame 121 refers to the thickness along the height direction of the mask frame 11 (see [reference]). Figure 2 The maximum spacing of the mesh skeleton 121 is (in the Z direction). For example, when the mesh skeleton 121 is a cylindrical structure, the cross-section of the mesh skeleton 121 along the height direction of the mask frame 11 is a circular structure, and the thickness of the mesh skeleton 121 refers to the diameter of the circular structure.

[0067] Furthermore, the wire mesh frame 121 is made of metal wire, and the material of the metal wire includes at least one of silver, tungsten steel wire, and brushed black titanium. The metal wire made of the above materials has high ductility, which helps to further reduce the problem of microcracks in solar cells, and has high light-shielding properties, which helps to ensure the effect of light shading.

[0068] Furthermore, such as Figure 7 As shown, the wire mesh 12 also includes a protective layer 13, which wraps around the outer surface of the wire mesh frame 121. By providing a protective layer 13 on the outside of the wire mesh frame 121, the protective layer 13 serves two purposes: firstly, it acts as an isolation layer, reducing the chance of the wire mesh frame 121 coming into contact with corrosive media and preventing the risk of corrosion; secondly, the protective layer 13 acts as a buffer layer, reducing the force generated by external collisions and friction on the wire mesh frame 121, ensuring the structural integrity of the wire mesh frame 121, and improving its service life. Furthermore, when the wire mesh frame 121 itself has cracks or pores, the protective layer 13 can fill these cracks and pores, thereby forming a continuous light-blocking barrier and increasing the exposure effect. For example, the protective layer 13 can be black paint.

[0069] Therefore, when the wire mesh skeleton 121 is made of metal wire, since metal wire is easily oxidized by reacting with oxygen and water in the air, a protective layer 13 is applied to the outer surface of the metal wire to achieve an isolation effect, reduce the chance of the metal wire coming into contact with water or oxygen, prevent the metal wire from being oxidized, and thus help to improve the service life of the wire mesh 12.

[0070] Furthermore, the thickness of the protective layer 13 is 5μm to 10μm. At this thickness, the protective layer 13 exhibits high uniformity, provides good protection, and does not affect the exposure effect.

[0071] Furthermore, when the screen mesh frame 121 is configured close to the solar cell, the distance between the screen mesh frame 121 and the solar cell is 40μm to 50μm. Since the mask 100 of this application has a perforated mesh 122, the presence of this perforated mesh 122 significantly reduces the probability of foreign particles from the solar cell adsorbing onto the mask 100. In addition, the distance between the mask 100 and the solar cell in the prior art is 70μm. Therefore, compared with the prior art, the distance between the mask 100 and the solar cell in this application is closer. The smaller distance allows the printing light source to effectively act on the non-electrode areas of the solar cell, ensuring the accuracy of exposure.

[0072] Further, see the return Figure 2 The mask frame 11 includes an outer frame 111 and a connecting plate 112 connected to the outer frame 111. The wire mesh skeleton 121 is connected to the connecting plate 112. Since the outer frame 111 and the wire mesh skeleton 121 are connected by the connecting plate 112, the connecting plate 112 has a certain buffering effect, which can effectively avoid the risk of deformation of the wire mesh skeleton 121 caused by the deformation of the outer frame 111; and the area of ​​the wire mesh skeleton 121 can be set to adapt to the size of the solar cell, thereby helping to reduce production costs.

[0073] Secondly, embodiments of this application disclose a printing apparatus, such as... Figure 8 and Figure 9 As shown, the printing device includes:

[0074] Printing light source 200;

[0075] The support platform 300 is located below the photomask 100 and is used to place the solar cell 400.

[0076] As in any of the first aspects, the mask 100 is disposed between the printing light source 200 and the support platform 300;

[0077] When a solar cell 400 is placed on the support platform 300, the screen frame 121 is used to block the printing light source 200 from shining on the solar cell 400, and the hollowed-out mesh 122 is used to allow the printing light source 200 to shine on the solar cell 400.

[0078] Furthermore, such as Figure 9 As shown, the printing device also includes a fixed bracket 500 and a blowing structure 600 disposed on the fixed bracket 500. The blowing structure 600 is disposed on or close to the mask 100, and is positioned to avoid the printing light source 200. The blowing structure 600 is used to blow away the screen 12. By setting the blowing structure 600, debris, dust, and other foreign objects on the screen frame 121 can be effectively removed, thereby improving the exposure effect and increasing the yield of the solar cell 400. For example, the blowing structure 600 can be a hair dryer.

[0079] In addition, see the return Figure 2 The mask frame 11 is provided with positioning points 113, and the printing device also includes a correction structure, which includes:

[0080] The position detection component is used to detect the position of the solar cell 400 placed on the support platform 300 and the position of the positioning point 113 on the mask frame 11;

[0081] The corrector is electrically connected to the position detection component. The corrector is used to correct the position of the solar cell 400 on the support platform 300 so that the electrode area of ​​the corrected solar cell 400 corresponds to the position of the wire mesh skeleton 121 in the mask 100.

[0082] By combining the position detection component and the correction component, the accuracy of the correspondence between the position of the wire mesh frame 121 and the electrode area of ​​the solar cell 400 can be effectively ensured, further ensuring the shading effect of the wire mesh frame 121 and guaranteeing the quality of the prepared solar cell 400 electrode structure. For example, the position detection component can be a visual detection component; the correction component can be a rotating structure, thus achieving the correspondence between the position of the solar cell 400 electrode area and the wire mesh frame 121 by rotating the support platform 300.

[0083] In addition, the printing device also includes a storage box for storing the mask 100; storing the mask 100 when it is not in use reduces the chance of the mask 100 being damaged by the outside world, provides a high degree of protection, and extends the service life of the mask 100.

[0084] Furthermore, the support platform 300 is provided with vacuum suction holes, which are distributed on the surface of the support platform 300. The vacuum suction holes are used to fix the solar cell 400 in the position of the support platform 300. The fixation of the solar cell 400 is achieved by the vacuum suction holes without damaging the surface of the solar cell 400, thereby improving the yield of the solar cell 400 to a greater extent.

[0085] Further, see the return Figure 10 The printing device also includes a lifting assembly 700, which is connected to the support platform 300. The lifting assembly 700 is used to drive the lifting movement of the support platform 300 relative to the mask 100. By controlling the distance between the support platform 300 and the screen frame 121 through the lifting assembly 700, the printing light source 200 can more effectively act on the solar cell 400. For example, the lifting assembly 700 can be a cylinder-type lifting structure, a scissor-type lifting structure, a lead screw lifting structure, etc.

[0086] In addition, the printing device includes a mounting bracket for placing the mask 100. The mounting bracket is equipped with a positioning element for fixing the mask 100 in its position. The fixing effect of the positioning element significantly improves the positioning effect of the mask 100, thereby ensuring high light-blocking performance. The positioning element can be, for example, a cylinder assembly.

[0087] The above provides a detailed description of a photomask and printing apparatus disclosed in the embodiments of this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand a photomask and printing apparatus. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of ​​this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A mask for making a patterned solar cell, characterized in that, The mask plate comprises: a mask frame; a screen, which is arranged in the mask frame, and comprises a screen skeleton and a plurality of hollow grids separated by the screen skeleton, the screen skeleton being connected to the mask frame; wherein the screen skeleton is configured to be arranged close to or in contact with the solar cell.

2. The mask according to claim 1, wherein, The thickness of the screen skeleton is 50-100 μm; and / or, the screen skeleton is a metal wire, and the material of the metal wire comprises at least one of silver, tungsten steel wire, and black titanium gold wire.

3. The mask according to claim 1, wherein, The screen further comprises a protective layer, which is wrapped on the outer surface of the screen skeleton.

4. The mask according to claim 3, wherein, The thickness of the protective layer is 5-10 μm.

5. The mask of claim 1, wherein, When the screen skeleton is configured to be arranged close to the solar cell, the distance between the screen skeleton and the solar cell is 40-50 μm.

6. The mask of claim 1, wherein, The screen skeleton comprises a plurality of first wire-like structures extending along a first direction and a plurality of second wire-like structures extending along a second direction, the first direction intersecting the second direction, the first wire-like structures and the second wire-like structures being used to separate the hollow grids; and / or, The screen skeleton comprises a plurality of parallel first wire-like structures, which are used to separate the hollow grids.

7. The mask according to any one of claims 1 to 6, wherein, The mask frame comprises an outer frame and a connecting plate connected to the outer frame, and the screen skeleton is connected to the connecting plate.

8. A printing device, characterized by The printing device comprises: a printing light source; a bearing platform, which is arranged below the mask plate and is used to place the solar cell; the mask plate according to any one of claims 1-7, which is arranged between the printing light source and the bearing platform; wherein, when the bearing platform is placed with the solar cell, the screen skeleton is used to block the printing light source from irradiating onto the solar cell, and the hollow grids are used to allow the printing light source to irradiate onto the solar cell.

9. The printing device of claim 8, wherein, The printing device further comprises a fixing support and a blowing structure arranged on the fixing support, the blowing structure being arranged on the mask plate or close to the mask plate, and the blowing structure being arranged to avoid the printing light source, and the blowing structure being used to blow the screen.

10. The printing device of claim 8, wherein, The mask frame is provided with a positioning point, and the printing device further comprises a correcting structure, which comprises: a position detection member, which is used to detect the position of the solar cell placed on the bearing platform and the position of the positioning point on the mask frame; a correcting member, which is electrically connected to the position detection member, and is used to correct the position of the solar cell on the bearing platform, so that the electrode area of the corrected solar cell corresponds to the position of the screen skeleton in the mask plate.

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