Solar cell and solar cell module

Abstract

The utility model is suitable for the technical field of solar cells, and provides a solar cell and a solar cell module, the solar cell comprises two opposite surfaces, and at least one of the two surfaces is provided with a textured structure; the suede structure comprises a plurality of pyramid-like structures, each pyramid-like structure comprises a cone top structure and a cone bottom structure which are integrated, and the bottom surface of each cone top structure and the top surface of each cone bottom structure are coplanar; the cone top structure comprises at least one pyramid structure; the cone bottom structure comprises at least one prismatic table structure, and the cross section of the at least one prismatic table structure is sequentially increased downwards from the top face. According to the solar cell provided by the utility model, the sunlight reflectivity can be reduced, the light absorption can be increased, and the photoelectric conversion efficiency of the solar cell can be improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of solar cells, and in particular relates to a solar cell and a solar cell assembly. Background Art

[0002] Texturing is an essential step in the production of monocrystalline silicon solar cells. Texturing involves texturing the surface of a single silicon wafer. The most common method is alkaline etching, which creates a dense, smooth, velvet pyramid structure on the surface of the monocrystalline silicon wafer. However, smooth velvet pyramid structures have a high reflectivity and cannot fully utilize sunlight, resulting in low solar cell photoelectric conversion efficiency. Utility Model Content

[0003] The utility model provides a solar cell and a solar cell assembly, aiming to solve the problem of high light reflectivity of the existing pyramid velvet structure.

[0004] The utility model provides a solar cell, comprising: two opposite surfaces, at least one of the two surfaces having a velvet structure;

[0005] The velvet structure includes a plurality of pyramid-like structures, each of which includes an integrated cone top structure and a cone bottom structure, wherein the bottom surface of the cone top structure and the top surface of the cone bottom structure are coplanar;

[0006] The cone top structure includes at least one pyramid structure;

[0007] The cone bottom structure includes at least one truncated pyramid structure, and the cross section of the at least one truncated pyramid structure increases sequentially downward from the top surface.

[0008] In some embodiments, the cone top structure includes a pyramid structure, and the cone bottom structure includes at least one truncated pyramid structure; the pyramid structure and the at least one truncated pyramid structure are distributed along the height direction of the velvet structure, and two adjacent truncated pyramid structures are coplanar.

[0009] In some embodiments, the cone top structure includes a plurality of pyramid structures, and the cone bottom structure includes a plurality of truncated pyramid structures;

[0010] The plurality of truncated pyramid structures include at least two truncated pyramid structures distributed along the height direction of the velvet structure, and at least two truncated pyramid structures distributed along the horizontal direction of the velvet structure;

[0011] Projections of the multiple pyramid structures along the height direction of the velvet structure are located within the bottom surface of the cone-bottom structure.

[0012] In some embodiments, the cone top structure includes a plurality of pyramid structures, and the cone bottom structure includes at least one truncated pyramid structure;

[0013] The plurality of pyramid structures are distributed on the top surface of the cone-bottom structure along the horizontal direction of the velvet structure, and the at least one truncated pyramid structure is distributed along the height direction of the velvet structure.

[0014] In some embodiments, when the cone-bottom structure includes a prism structure, the angle between the side edge of the cone-top structure and the horizontal direction is smaller than the angle between the side edge of the prism structure and the horizontal direction.

[0015] In some embodiments, when the cone-bottom structure includes a plurality of prism structures, the angles between the side edges of at least one prism structure and the horizontal direction increase sequentially from the top surface downward.

[0016] In some embodiments, the maximum angle between the side edges of the at least one pyramid structure and the horizontal direction is 90°.

[0017] In some embodiments, the side edges of the pyramid-like structure are arc-shaped, and the side surfaces of the pyramid-like structure are concave.

[0018] In some embodiments, a plurality of hole structures are disposed on at least a portion of the surface of the pyramid-like structure.

[0019] The utility model also provides a solar cell assembly, comprising: the solar cell as described in any one of the above items.

[0020] The solar cell and solar cell assembly provided by the utility model use several types of pyramid structures as the velvet structure on at least one surface. Since the several types of pyramid structures have a cone top structure and a cone bottom structure composed of multiple prism structures, the reflectivity of sunlight can be reduced, the light absorption can be increased, and the photoelectric conversion efficiency of the solar cell can be ultimately improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is one of the schematic diagrams of the velvet structure of the solar cell provided by the embodiment of the utility model;

[0022] Figure 2 This is the second schematic diagram of the velvet structure of the solar cell provided by the embodiment of the utility model;

[0023] Figure 3 This is the third schematic diagram of the velvet structure of the solar cell provided by the embodiment of the utility model;

[0024] Figure 4 This is the fourth schematic diagram of the velvet structure of the solar cell provided by the embodiment of the utility model;

[0025] Figure 5 This is the fifth schematic diagram of the velvet structure of the solar cell provided by the embodiment of the utility model;

[0026] Figure 6 This is the sixth schematic diagram of the velvet structure of the solar cell provided by the embodiment of the present utility model;

[0027] Figure 7 This is the seventh schematic diagram of the velvet structure of the solar cell provided by the embodiment of the utility model;

[0028] Figure 8 This is the eighth schematic diagram of the velvet structure of the solar cell provided by the embodiment of the utility model;

[0029] Figure 9 This is the ninth schematic diagram of the velvet structure of the solar cell provided by the embodiment of the present utility model;

[0030] Figure 10 This is the tenth schematic diagram of the velvet structure of the solar cell provided by the embodiment of the utility model;

[0031] Figure 11 This is the eleventh schematic diagram of the velvet structure of the solar cell provided by the embodiment of the utility model;

[0032] Figure 12 This is the twelfth schematic diagram of the velvet structure of the solar cell provided by the embodiment of the utility model;

[0033] Figure 13 This is the thirteenth schematic diagram of the velvet structure of the solar cell provided by the embodiment of the utility model;

[0034] Figure 14 This is the fourteenth schematic diagram of the velvet structure of the solar cell provided by the embodiment of the present utility model;

[0035] Figure 15 This is the fifteenth schematic diagram of the velvet structure of the solar cell provided by the embodiment of the utility model;

[0036] Figure 16 This is the sixteenth schematic diagram of the velvet structure of the solar cell provided by the embodiment of the utility model;

[0037] Figure 17 This is the seventeenth schematic diagram of the velvet structure of the solar cell provided by the embodiment of the present utility model;

[0038] Figure 18 This is the eighteenth schematic diagram of the velvet structure of the solar cell provided by the embodiment of the present utility model;

[0039] Figure 19 It is a structural schematic diagram of a solar cell assembly provided by an embodiment of the utility model. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0041] References to "embodiments" or "implementations" in this disclosure mean that a particular feature, component, or characteristic described in connection with an embodiment or implementation may be included in at least one embodiment of the disclosure. The appearance of such phrases in various places in the specification does not necessarily refer to the same embodiment, nor do they constitute independent or alternative embodiments that are mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0042] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "left", "right", "horizontal", "top", "bottom", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0043] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections, or mutual communication; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0044] The following combination Figures 1 to 19 , the solar cell and solar cell assembly provided by the embodiment of the utility model are described in detail through specific embodiments and their application scenarios.

[0045] Figure 1 This is one of the schematic diagrams of the velvet structure of the solar cell provided by the embodiment of the utility model.

[0046] like Figure 1 As shown, an embodiment of the present invention provides a solar cell, comprising: two opposite surfaces, at least one of the two surfaces having a suede structure;

[0047] The velvet structure includes a plurality of pyramid-like structures, each of which includes an integrated cone top structure 10 and a cone bottom structure 20, wherein the bottom surface of the cone top structure 10 and the top surface of the cone bottom structure 20 are coplanar;

[0048] The cone top structure 10 includes at least one pyramid structure;

[0049] The cone bottom structure 20 includes at least one truncated pyramid structure, and the cross section of the at least one truncated pyramid structure increases sequentially from the top surface downwards.

[0050] It should be noted that a solar cell has two opposing surfaces. The two surfaces can have the same or different textured structures. For example, one surface has a textured structure and the other is polished, or one surface has a textured structure and the second surface also has a textured structure. Either surface can serve as the front or back side of the solar cell, without specific limitation.

[0051] In the related art, texturing is an essential and important step in the production process of solar cells. Texturing of single-crystal silicon is to perform texturing treatment on the surface of a single silicon wafer. The most commonly used method is alkaline etching, which forms a dense pyramid velvet structure on the surface of the single-crystal silicon wafer. The common pyramid velvet structure is a quadrangular pyramid structure. The velvet structure in the embodiment of the present invention is obtained by performing secondary texturing on at least one pyramid velvet structure, modifying the pyramid velvet structure into a pyramid-like structure, thereby reducing the reflectivity of sunlight and improving the photoelectric conversion efficiency of the solar cell.

[0052] like Figures 1 to 18 As shown, the velvet structure in the embodiment of the present invention includes several pyramid-like structures. The pyramid-like structure is composed of a polygonal base with vertices of the polygonal base connected to side edges at one or more points outside the base (i.e., the vertices of the pyramid-like structure). The polygonal base can be a regular polygon such as a quadrilateral, pentagon, or hexagon, or an irregular polygon. The side edges can be a figure composed of several line segments that are not on the same straight line and connected end to end, such as a broken line segment or a curved line segment, which is not specifically limited here.

[0053] Optionally, the pyramid-like structure is an integrated structure, which can be divided into two parts for description. The integrated structure includes a cone top structure 10 and a cone bottom structure 20 distributed along the height direction of the velvet structure. The height direction of the velvet structure refers to the length of the perpendicular segment from the apex of the cone top structure 10 to the bottom of the cone bottom structure 20.

[0054] The common surface of the cone top structure 10 and the cone bottom structure 20 is parallel to the bottom surface of the pyramid-like structure and can have the same shape. Figure 1 , the bottom surface of the pyramid-like structure is a quadrilateral, then the common surface of the cone top structure 10 and the cone bottom structure 20 is also a quadrilateral; Figure 2 , the bottom surface of the pyramid-like structure is a pentagon, then the common surface of the cone-top structure 10 and the cone-bottom structure 20 is a pentagon, and so on. In other embodiments, the common surface of the cone-top structure 10 and the cone-bottom structure 20 may be different from the bottom surface of the pyramid-like structure, which is not specifically limited here.

[0055] Optionally, the top structure 10 includes at least one pyramid structure, and the bottom structure 20 includes at least one truncated pyramid structure. The number of pyramid structures can be one or more, and the number of truncated pyramid structures can be one or more. The height of the top structure 10 and the height of the bottom structure 20 can be the same or different. The heights corresponding to the multiple pyramid structures can be the same or different, and the heights corresponding to the multiple truncated pyramid structures can also be the same or different, without specific limitation herein.

[0056] In the embodiment of the present invention, the plurality of pyramid structures may be distributed along the height direction or the horizontal direction of the velvet structure, and the plurality of pyramid structures may be distributed along the height direction or the horizontal direction of the velvet structure.

[0057] It should be noted that a pyramid structure is formed by connecting straight line segments from each vertex of the polygonal base to a point outside the plane in which it lies. These straight line segments are called the pyramid's lateral edges, and the point where they connect is called the pyramid's vertex. The sides of a pyramid are all triangles formed by connecting the vertex with the vertices of the base. A pyramid structure is formed by cutting a pyramid with a plane parallel to its base, resulting in the geometric shape between the cross section and the base. The cross section is also called the upper base of the pyramid, and the base of the original pyramid structure is called the lower base.

[0058] In some embodiments, the cone top structure 10 includes a pyramid structure, and the cone bottom structure 20 includes at least one truncated pyramid structure; the pyramid structure and at least one truncated pyramid structure are distributed along the height direction of the velvet structure, and two adjacent truncated pyramid structures are coplanar.

[0059] In actual implementation, one pyramid structure and at least one truncated pyramid structure are distributed along the height direction of the velvet structure, and the bottom surface of the pyramid structure is coplanar with the top surface of the adjacent truncated pyramid structure.

[0060] Reference Figure 1 , this type of pyramid structure includes a quadrangular pyramid structure and a quadrangular pyramid structure. Figure 2 , this type of pyramid structure includes a pentagonal pyramid structure and a pentagonal pyramid structure, refer to Figure 3, this type of pyramid structure includes a quadrangular pyramid structure and two quadrangular pyramid structures. Figure 4 , this type of pyramid structure includes a quadrangular pyramid structure and three quadrangular pyramid structures.

[0061] In an embodiment of the present invention, the cross-section of at least one pyramidal structure increases sequentially from the top surface downward. The cross-sections of the pyramidal structure and each pyramidal structure increase linearly. However, the cross-sectional area between a pyramidal structure and an adjacent pyramidal structure, or between two adjacent pyramidal structures, or between multiple pyramidal structures, increases nonlinearly. This is because the cross-sectional area suddenly changes at coplanar locations, which in turn causes the lateral edges of the pyramidal structure to be broken lines or curved segments.

[0062] It should be noted that if Figure 5 and Figure 6 As shown, due to inconsistent etching rates or incomplete coverage of the reaction solution, after the pyramid velvet structure is secondarily velveted, multiple pyramid velvet structures are close together. During the modification process, the base of the pyramid may become wider, that is, multiple pyramid structures are fused together, and finally a pyramid-like structure sharing a base is formed. One end of some side edges may overlap at a certain height from the bottom surface of the cone top structure, and the other end of the side edges extends to the corresponding vertices. The bottom surface of this type of pyramid structure can be a polygon such as a quadrilateral, pentagon, hexagon or heptagon, and the number of sides of the polygon is determined according to the number of fused pyramid velvet structures. At this time, the cone top structure includes multiple pyramid structures, that is, it has multiple vertices, and the lengths of the vertical segments from multiple vertices to the same bottom surface may be the same or different. Multiple pyramid structures are distributed along the horizontal direction of the velvet structure.

[0063] In some embodiments, the cone top structure 10 includes a plurality of pyramid structures, and the cone bottom structure 20 includes at least one truncated pyramid structure;

[0064] A plurality of pyramid structures are distributed on the top surface of the cone-bottom structure 20 along the horizontal direction of the velvet structure, and at least one prism structure is distributed along the height direction of the velvet structure.

[0065] like Figure 5 and Figure 6 As shown, the top structure 10 includes two pyramid structures, and the bottom structure 20 includes two pyramid structures. The two pyramid structures are distributed on the top surface of the bottom structure 20 along the horizontal direction of the velvet structure, that is, the bottom surfaces of the two pyramid structures overlap with the top surfaces of the adjacent pyramid structures, and the two pyramid structures are distributed along the height direction of the velvet structure.

[0066] like Figure 7 and Figure 8As shown, the top structure 10 includes two pyramid structures, and the bottom structure 20 includes one pyramid structure. The two pyramid structures are distributed on the top surface of the pyramid structure along the horizontal direction of the velvet structure, that is, the bottom surfaces of the two pyramid structures overlap with the top surfaces of adjacent pyramid structures, and the two pyramid structures and the one pyramid structure are distributed along the height direction of the velvet structure.

[0067] In some embodiments, the cone top structure 10 includes a plurality of pyramid structures, and the cone bottom structure 20 includes a plurality of truncated pyramid structures;

[0068] The plurality of pyramid structures include at least two pyramid structures distributed along the height direction of the suede structure, and at least two pyramid structures distributed along the horizontal direction of the suede structure;

[0069] The projections of the multiple pyramid structures along the height direction of the velvet structure are located within the bottom surface of the cone bottom structure 20 .

[0070] like Figure 9 and Figure 10 As shown, the top structure 10 includes two pyramid structures, and the bottom structure 20 includes five pyramid structures. The two pyramid structures are distributed horizontally along the velvet structure, and each pyramid structure has two pyramid structures distributed along the height of the velvet structure. A common pyramid structure is also distributed along the height of the velvet structure. Therefore, the projections of the multiple pyramid structures along the height of the velvet structure are located within the bottom surface of the bottom structure 20.

[0071] Here are several different types of pyramid-like structures:

[0072] 1. When there is one pyramid structure and one truncated pyramid structure, the pyramid-like structure includes one vertex, at least four lateral edges, and at least eight side faces. For example, when the base is a quadrilateral, the pyramid-like structure may include one vertex, four lateral edges, and eight side faces. When the base is a pentagon, it may include one vertex, five lateral edges, and ten side faces. When the base is a hexagon, it may include one vertex, six lateral edges, and 12 side faces, and so on. In this case, the number of lateral edges is half the number of side faces.

[0073] 2. When there is one pyramid structure and multiple pyramid structures, the number of lateral edges and side faces of the pyramid-like structure is determined based on the shape of the base and the number of pyramid structures, respectively. For example, when the base is quadrilateral and there are two pyramid structures, the pyramid-like structure may have one vertex, four lateral edges, and 12 side faces. When the base is pentagonal and there are two pyramid structures, the pyramid-like structure may have one vertex, five lateral edges, and 15 side faces. When the base is quadrilateral and there are three pyramid structures, the pyramid-like structure may have one vertex, four lateral edges, and 16 side faces, and so on.

[0074] 3. When there are multiple pyramid structures and one truncated pyramid structure, the pyramid-like structure includes at least two vertices, at least eight lateral edges, and at least ten side faces. For example, when the base is quadrilateral and there are two pyramid structures, the pyramid-like structure may include two vertices, eight lateral edges, and ten side faces. When the base is pentagonal and there are two pyramid structures, the pyramid-like structure may include two vertices, nine lateral edges, and twelve side faces. When the base is hexagonal, the pyramid-like structure may include two vertices, ten lateral edges, and fourteen side faces, and so on.

[0075] In other embodiments, when there are multiple pyramid structures and multiple pyramid structures, the number of vertices, side edges, and side faces included in the pyramid-like structures are determined based on the actual structure and will not be repeated here.

[0076] It can be understood that the side edge refers to the side edge of the pyramid-like structure, and each side edge is composed of the side edge of the pyramid structure and the side edge of the frustum structure.

[0077] The solar cell provided by the embodiment of the present utility model uses several types of pyramid structures as the velvet structure on at least one surface. Since the several types of pyramid structures have a cone-top structure and a cone-bottom structure composed of multiple prism structures, the reflectivity of sunlight can be reduced, the light absorption can be increased, and the photoelectric conversion efficiency of the solar cell can be ultimately improved.

[0078] In some embodiments, when the cone-bottom structure 20 includes a truncated pyramid structure, the angle between the side edge of the cone-top structure 10 and the horizontal direction is smaller than the angle between the side edge of the truncated pyramid structure and the horizontal direction.

[0079] like Figure 1 and Figure 11 As shown, when the cone bottom structure 20 includes a prism structure, the angle α1 between the side edge of the cone top structure 10 and the horizontal direction is smaller than the angle α2 between the side edge of the prism structure and the horizontal direction, thereby increasing the surface area of ​​the velvet structure and improving the probability of light contacting the silicon material.

[0080] Compared with the pyramid velvet structure in the related art, the pyramid-like structure in the embodiment of the present invention has a structure with more faces. Light will be reflected and refracted between different faces of the velvet structure, increasing the propagation path of light in the velvet structure, making it difficult for light to be directly reflected out. The escaped light will be greatly reduced, thereby improving light absorption and thereby improving the photoelectric conversion efficiency of solar cells.

[0081] In some embodiments, when the cone-bottom structure includes a plurality of truncated pyramid structures, the angle between the side edges of at least one truncated pyramid structure and the horizontal direction increases sequentially from the top surface downwards.

[0082] like Figure 12As shown, when the cone bottom structure 20 is N prism structures, the angle between the side edge of at least one prism structure and the horizontal direction from the top surface downward changes in the following trend: α1<α2<α3<……<α N . Wherein, N is a positive integer.

[0083] It can be understood that the more prism structures there are, the larger the angle between the side edges of at least one prism structure and the horizontal direction. The pyramid-like structure absorbs sunlight more strongly than the traditional pyramid velvet structure, has a lower light reflectivity, and achieves higher photoelectric conversion efficiency.

[0084] In some embodiments, the maximum angle between the side edges of at least one pyramid structure and the horizontal direction is 90°.

[0085] It is understood that when the cross section of at least one truncated pyramid structure increases from the top to the bottom, the size of the cross section can remain unchanged after reaching the maximum value. In this case, the top and bottom surfaces of the truncated pyramid structure corresponding to the maximum cross section are the same size as the bottom surface of the pyramid-like structure, and the maximum angle α between the side edges of the truncated pyramid structure and the horizontal direction is max is 90°.

[0086] During the secondary texturing process, the reaction liquid concentration and reaction time can be controlled to control the angle between the side edges of the pyramid structure corresponding to the maximum cross-section and the horizontal direction to 90°, thereby ensuring relatively low light reflectivity and higher photoelectric conversion efficiency.

[0087] In some embodiments, the side edges of the pyramid-like structure are arc-shaped, and the side surfaces of the pyramid-like structure are concave.

[0088] like Figure 13 As shown, the side edges of the cone top structure 10 can be arc-shaped, the side surfaces of the cone top structure 10 can also be arc-shaped, the side edges of one or more prism structures in the cone bottom structure 20 can be arc-shaped, and the side surfaces of one or more prism structures can also be arc-shaped, which are not specifically limited here.

[0089] like Figure 14 As shown, taking the corrosion process of the cone top structure 10 in the pyramid-like structure as an example, it can be seen that the side of the pyramid velvet structure is modified into a concave surface, and the side edge is modified into an arc-shaped cross-sectional change process.

[0090] In some embodiments, the side edges of the pyramid-like structure are wavy, and the side surfaces of the pyramid-like structure are wavy curved surfaces.

[0091] In actual implementation, the side edges of the cone top structure 10 can be wavy, and the side surfaces of the cone top structure 10 can also be wavy curved surfaces. It is understandable that the side edges of one or more truncated pyramid structures in the cone bottom structure 20 can be wavy, and the side surfaces of one or more truncated pyramid structures can also be wavy surfaces, which are not specifically limited here. Figure 15 As shown, taking the corrosion process of the cone top structure 10 in the pyramid-like structure as an example, it can be seen that the side of the pyramid velvet structure is modified into a wavy curved surface, and the side edge is modified into a wavy cross-sectional change process.

[0092] In some embodiments, the side edges of the pyramid-like structure are sawtooth-shaped, and the side surfaces of the pyramid-like structure are sawtooth-shaped side surfaces.

[0093] like Figure 16 As shown, taking the top structure 10 of the pyramid-like structure as an example, the side edges of the top structure 10 can be serrated, and the side surfaces of the top structure 10 can also be serrated curved surfaces. It is understood that the side edges of one or more truncated pyramid structures in the base structure 20 can also be serrated, and the side surfaces of one or more truncated pyramid structures can also be serrated surfaces, without specific limitation herein.

[0094] like Figure 16 As shown, taking the corrosion process of the pyramid-like top structure 10 as an example, it can be seen that the side of the pyramid velvet structure is modified into a sawtooth curved surface, and the side edge is modified into a sawtooth cross-sectional change process.

[0095] In some embodiments, a plurality of hole structures are disposed on at least a portion of the surface of the pyramid-like structure.

[0096] like Figure 17 As shown, taking the top structure 10 of the pyramid-like structure as an example, multiple hole structures can be provided on the side surface of the top structure 10, and multiple hole structures can be provided on the side surface of one or more truncated pyramid structures in the bottom structure 20. The hole structures can be spherical, circular, elliptical, elongated, or square, etc., and are not specifically limited here.

[0097] In some embodiments, the plurality of cell structures are honeycomb-shaped.

[0098] In actual implementation, Figure 18 As shown, the hole structure can also be honeycomb-shaped, which can further increase the surface area of ​​the pyramid-like structure and reduce the reflectivity.

[0099] It is understandable that the hole structure can be similar to a pyramid structure with a micron-level concave-convex texture. The deeper the hole, the less reflection on the surface of the suede structure, the better the light trapping effect, and the lower the light reflectivity.

[0100] The solar cell provided by the utility model can reduce light reflectivity to 5% to 6%, and can increase photoelectric conversion efficiency by 0.16%.

[0101] like Figure 19 As shown, the present invention further provides a solar cell assembly 100, comprising: a solar cell 101 as described in any one of the above items.

[0102] The solar cell 101 has been described in detail in the above embodiment and will not be described again here.

[0103] The solar cell assembly provided by the embodiment of the present utility model uses several types of pyramid structures as the velvet structure on at least one surface. Since the several types of pyramid structures have a cone-top structure and a cone-bottom structure composed of multiple prism structures, the reflectivity of sunlight can be reduced, the light absorption can be increased, and the photoelectric conversion efficiency of the solar cell can be ultimately improved.

[0104] It is understandable that those skilled in the art can, under the guidance of the above embodiments, combine various implementation methods in the above embodiments to obtain technical solutions of multiple implementation methods.

[0105] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A solar cell, characterized in that: include: Two opposing surfaces, at least one of the two surfaces having a suede structure; The velvet structure includes a plurality of pyramid-like structures, each of which includes an integrated cone top structure and a cone bottom structure, wherein the bottom surface of the cone top structure and the top surface of the cone bottom structure are coplanar; The cone top structure includes at least one pyramid structure; The cone bottom structure includes at least one truncated pyramid structure, and the cross section of the at least one truncated pyramid structure increases sequentially downward from the top surface.

2. The solar cell according to claim 1, wherein The cone top structure includes a pyramid structure, and the cone bottom structure includes at least one truncated pyramid structure; the pyramid structure and the at least one truncated pyramid structure are distributed along the height direction of the velvet structure, and two adjacent truncated pyramid structures are coplanar.

3. The solar cell according to claim 1, wherein The cone top structure includes a plurality of pyramid structures, and the cone bottom structure includes a plurality of truncated pyramid structures; The plurality of truncated pyramid structures include at least two truncated pyramid structures distributed along the height direction of the velvet structure, and at least two truncated pyramid structures distributed along the horizontal direction of the velvet structure; Projections of the multiple pyramid structures along the height direction of the velvet structure are located within the bottom surface of the cone-bottom structure.

4. The solar cell according to claim 1, wherein The cone top structure includes a plurality of pyramid structures, and the cone bottom structure includes at least one prism structure; The plurality of pyramid structures are distributed on the top surface of the cone-bottom structure along the horizontal direction of the velvet structure, and the at least one truncated pyramid structure is distributed along the height direction of the velvet structure.

5. The solar cell according to claim 1, wherein In the case where the cone bottom structure includes a truncated pyramid structure, the angle between the side edge of the cone top structure and the horizontal direction is smaller than the angle between the side edge of the truncated pyramid structure and the horizontal direction.

6. The solar cell according to claim 1, wherein In the case where the cone bottom structure includes a plurality of truncated pyramid structures, the angles between the side edges of at least one truncated pyramid structure and the horizontal direction increase sequentially from the top surface downwards.

7. The solar cell according to claim 6, characterized in that The maximum value of the angle between the side edge of the at least one prism structure and the horizontal direction is 90°.

8. The solar cell according to claim 1, wherein The side edges of the pyramid-like structure are arc-shaped, and the side surfaces of the pyramid-like structure are concave.

9. The solar cell according to any one of claims 1 to 8, characterized in that: A plurality of hole structures are provided on at least a portion of the surface of the pyramid-like structure.

10. A solar cell module, characterized in that: The solar cell comprises the solar cell according to any one of claims 1 to 9.

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