Solar cell and solar cell preparation system

Abstract

The utility model discloses a solar cell and a solar cell preparation system. The solar cell is provided with a mark point, and the mark point is a through hole penetrating through the solar cell. The mark point area is directly penetrated, so that more obvious chromatic aberration can be formed between the penetrated area and the surrounding area, the capture capability of the visual identification mechanism on the mark point is improved, and the alignment precision during manufacturing of the solar cell is improved.

Description

Technical Field

[0001] This utility model relates to the field of photovoltaic technology, specifically to solar cells and solar cell fabrication systems. Background Technology

[0002] BC (Browser-Based) cells, as one of the current popular directions in the development of crystalline silicon cells, have their metal electrodes arranged in an interdigitated pattern on the back of the cell, achieving unobstructed front-side coverage, providing a larger light-absorbing area, and improving the overall photoelectric conversion efficiency of the cell. Simultaneously, they have better compatibility with TOPCon and HJT technologies, achieving higher photoelectric conversion efficiency while maximizing the use of existing equipment and saving costs. However, the production process of BC cells is relatively long, especially the fabrication of the back electrode, which requires at least two laser grooving processes, placing a high demand on laser precision. Current mainstream laser processes typically involve the first laser processing using an edge-grabbing method, while the second laser uses the marked points created by the first laser as a reference for processing, followed by wet etching to achieve P / N region isolation. The capture of the marked points is mainly accomplished by a CCD camera by identifying the contrast between the marked area and the surrounding area. If the P / N region cannot form an effective color difference, the second laser will not be able to identify and process it. Utility Model Content

[0003] To enhance the recognizability of marker points, this utility model provides a solar cell and a solar cell fabrication system.

[0004] According to one aspect of the present invention, a solar cell is provided having marking points, which are through holes penetrating the solar cell.

[0005] In some implementations, the inner wall of the through-hole has a passivation film.

[0006] In some embodiments, the passivation film comprises one or more layers of silicon oxide, aluminum oxide, silicon nitride, and silicon oxynitride.

[0007] In some implementations, the width of the marker point is 5-20 μm.

[0008] In some implementations, the number of markers is four.

[0009] In some embodiments, the positive and negative grid lines of the solar cell are disposed on different sides of the solar cell, or both are disposed on the back side of the solar cell.

[0010] A solar cell fabrication system includes, in sequence, the following components: a first laser device suitable for forming marking points on a solar cell, wherein the marking points are through holes penetrating the solar cell; a wet etching device; a deposition device; a diffusion device; and a second laser device.

[0011] A solar cell fabrication system includes, in sequence, the following: a first laser device; a laser drilling device suitable for forming marking points on a solar cell, wherein the marking points are through holes penetrating the solar cell; a wet etching device; a deposition device; a diffusion device; and a second laser device.

[0012] The present invention directly penetrates the marked area, which can make the penetrated area and the surrounding area form a more obvious color difference, increase the ability of the visual recognition mechanism to capture the marked point, and improve the alignment accuracy during the manufacturing of solar cells. Attached Figure Description

[0013] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0014] Figure 1 This is a partial cross-sectional view of a solar cell according to an exemplary embodiment of the present invention.

[0015] Figure 2 The architecture of a solar cell fabrication system is shown in an exemplary embodiment of this utility model.

[0016] Figure 3 The architecture of a solar cell fabrication system is shown in another exemplary embodiment of this utility model.

[0017] In the diagram, 1 is the solar cell, 2 is the marker point, and 3 is the passivation film. Detailed Implementation

[0018] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0019] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0020] In this application, 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 application 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.

[0021] Furthermore, in addition to indicating location 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 application based on the specific circumstances.

[0022] Furthermore, the terms "installation," "setup," "equipped with," "connection," "linking," and "socketing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0023] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0024] Figure 1 This is a partial cross-sectional view of a solar cell according to an exemplary embodiment of the present invention.

[0025] like Figure 1 As shown, according to one aspect of the present invention, a solar cell 1 is provided, having a marking point 2, the marking point 2 being a through hole penetrating the solar cell 1.

[0026] The solar cell 1 of this utility model has a marker 2 penetrating through the solar cell 1. Since the marker 2 penetrates through the solar cell 1, it can create a more obvious color difference between the penetrating area and the surrounding area, increasing the ability of visual recognition devices such as CCD cameras to capture the marker 2 and improving the alignment accuracy during the manufacturing of the solar cell 1.

[0027] According to an exemplary embodiment of the present invention, the inner wall of the through-hole has a passivation film 3. The passivation film 3 can passivate the inner wall of the through-hole, reducing carrier recombination at the marked point 2. For example, the passivation film comprises one or more layers of silicon oxide, aluminum oxide, silicon nitride, and silicon oxynitride.

[0028] According to an exemplary embodiment of the present invention, the width of the marker point 2 is 5-20 μm.

[0029] According to an exemplary embodiment of the present invention, the number of marker points 2 is 4.

[0030] According to an exemplary embodiment of the present invention, both the positive and negative grid lines of the solar cell 1 are disposed on the back side of the solar cell 1. The solar cell 1 in this embodiment is a back-contact solar cell.

[0031] Figure 2 This is a schematic diagram of a solar energy generation system according to an exemplary embodiment of the present invention.

[0032] like Figure 2 As shown, according to another aspect of the present invention, a solar cell fabrication system is provided. This system includes a first laser device, a wet etching apparatus, a deposition apparatus, a diffusion apparatus, and a second laser device arranged sequentially in a process order. The solar cell fabrication system of this embodiment is suitable for fabricating back-contact solar cells. The first laser device is suitable for patterning and ablation of a first mask on the surface of a silicon wafer. The first laser device is also suitable for forming marking points 2 on the solar cell 1, the marking points 2 being through-holes penetrating the solar cell 1. The wet etching apparatus is suitable for patterning and etching a first doped layer on the surface of the silicon wafer. The deposition apparatus is suitable for depositing an amorphous silicon layer on the back side of the silicon wafer. The diffusion apparatus is suitable for fabricating a second doped layer. The second laser device is suitable for patterning and ablation of a second mask layer on the surface of the second doped layer.

[0033] Figure 3 This is a schematic diagram of a solar energy generation system according to another exemplary embodiment of the present invention.

[0034] like Figure 3As shown, according to another aspect of the present invention, a solar cell fabrication system is provided. This system includes a first laser device, a laser drilling device, a wet etching device, a deposition device, a diffusion device, and a second laser device arranged sequentially in a process order. The laser drilling device is suitable for forming marking points 2 on a solar cell 1, where the marking points 2 are through holes penetrating the solar cell 1.

[0035] Finally, it should be noted that the above are merely preferred embodiments of this application and are not intended to limit this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A solar cell, characterized in that, It has marking points, which are through holes penetrating the solar cell; The inner wall of the through hole has a passivation film; The passivation film comprises one or more layers of silicon oxide, aluminum oxide, silicon nitride, and silicon oxynitride. The width of the marker point is 5-20 μm; The number of marker points is 4; The positive and negative grid lines of the solar cell are both located on the back side of the solar cell.

2. A solar cell fabrication system, characterized in that, Including those set up sequentially according to the process steps: A first laser device is adapted to form marking points on the solar cell, wherein the marking points are through holes penetrating the solar cell; Wet etching equipment; Deposition equipment; Diffusion equipment; And a second laser device.

3. A solar cell fabrication system, characterized in that, Including those set up sequentially according to the process steps: First laser device; A laser drilling device is suitable for forming marking points on the solar cell, wherein the marking points are through holes penetrating the solar cell; Wet etching equipment; Deposition equipment; Diffusion equipment; And a second laser device.

Images