技术领域Technical Field
本实用新型涉及太阳能电池技术领域，具体涉及一种双面PERC太阳能电池及其背电极结构。The utility model relates to the technical field of solar cells, and in particular to a double-sided PERC solar cell and a back electrode structure thereof.
背景技术Background technique
太阳能电池为一种清洁、绿色及安全的能源，在替代传统化石能源上起着越来越重要的作用。现有技术中，PERC(Passivated Emitter and Rear Contact Cell，发射极钝化和背面接触)太阳能电池片中，单面PERC太阳能电池的背面主要由全铝背场组成，覆盖在硅片的整个背面，全铝背场可提高开路电压和短路电流，使少数载流子远离表面，少数载流子复合率降低，从而整体上提高电池效率。然而，由于全铝背场不透光，因此电池的背面无法吸收光能，其光电转换效率难以大幅度提升。为提高PERC电池的光电转换效率，将不透光的全铝背场改为栅线(如图1所示，双面PERC太阳能电池的背电极结构包括铝副栅1’和铝主栅2’)，实现电池背面透光，形成双面PERC电池。Solar cells are a clean, green and safe energy source, playing an increasingly important role in replacing traditional fossil energy. In the prior art, in PERC (Passivated Emitter and Rear Contact Cell, emitter passivation and rear contact) solar cells, the back of a single-sided PERC solar cell is mainly composed of an all-aluminum back field, covering the entire back of the silicon wafer. The all-aluminum back field can increase the open circuit voltage and short circuit current, keep minority carriers away from the surface, and reduce the minority carrier recombination rate, thereby improving the overall efficiency of the cell. However, since the all-aluminum back field is opaque, the back of the cell cannot absorb light energy, and its photoelectric conversion efficiency is difficult to significantly improve. In order to improve the photoelectric conversion efficiency of the PERC cell, the opaque all-aluminum back field is replaced with a grid line (as shown in Figure 1, the back electrode structure of the double-sided PERC solar cell includes an aluminum sub-grid 1' and an aluminum main grid 2'), so that the back of the cell is transparent to form a double-sided PERC cell.
但是双面PERC太阳能电池的铝主栅在烧结过程中，硅铝合金会逐渐形成，液态铝进入硅层，并由于硅在铝中的溶解度大于铝在硅中的溶解度，从而导致硅向铝中扩散的体积大于铝向硅中扩散的体积，使得硅片内部会出现空隙，硅片上产生缺陷，进一步影响太阳能电池的效率。However, during the sintering process of the aluminum main grid of the double-sided PERC solar cell, a silicon-aluminum alloy will gradually form, and liquid aluminum will enter the silicon layer. Since the solubility of silicon in aluminum is greater than the solubility of aluminum in silicon, the volume of silicon diffused into aluminum is greater than the volume of aluminum diffused into silicon, resulting in gaps inside the silicon wafer and defects on the silicon wafer, further affecting the efficiency of the solar cell.
实用新型内容Utility Model Content
针对现有技术中的问题，本实用新型的目的在于提供一种双面PERC太阳能电池及其背电极结构，以减少铝主栅的烧结面积，减少缺陷的形成，提高太阳能电池的转换效率。In view of the problems in the prior art, the purpose of the present invention is to provide a double-sided PERC solar cell and a back electrode structure thereof, so as to reduce the sintering area of the aluminum main grid, reduce the formation of defects, and improve the conversion efficiency of the solar cell.
本实用新型实施例提供了一种双面PERC太阳能电池的背电极结构，包括栅线电极，所述栅线电极包括多条铝副栅，沿第一方向平行设置；以及至少一条铝主栅，沿第二方向设置；每一所述铝主栅包括间隔设置的两个子主栅，每一所述子主栅设有镂空结构；其中，所述第一方向与所述第二方向垂直。An embodiment of the utility model provides a back electrode structure of a double-sided PERC solar cell, including a grid line electrode, wherein the grid line electrode includes a plurality of aluminum sub-grids arranged in parallel along a first direction; and at least one aluminum main grid arranged along a second direction; each of the aluminum main grids includes two sub-main grids arranged at intervals, and each of the sub-main grids is provided with a hollow structure; wherein the first direction is perpendicular to the second direction.
在一些实施例中，还包括背银电极，所述背银电极设有银触角；所述铝主栅包括沿所述第二方向间隔设置的粗栅部和细栅部，所述背银电极置于所述粗栅部，所述被银电极通过所述银触角与所述主栅电连接。In some embodiments, it also includes a back silver electrode, which is provided with silver antennae; the aluminum main grid includes a coarse grid portion and a fine grid portion spaced apart along the second direction, the back silver electrode is placed in the coarse grid portion, and the silver electrode is electrically connected to the main grid through the silver antennae.
在一些实施例中，每一所述铝副栅的宽度为80μm～120μm。In some embodiments, the width of each of the aluminum sub-grids is 80 μm to 120 μm.
在一些实施例中，每一所述铝主栅的宽度为400μm～600μm。In some embodiments, the width of each of the aluminum main grids is 400 μm to 600 μm.
在一些实施例中，每一所述子主栅的镂空结构的宽度为200μm～300μm。In some embodiments, the width of each hollow structure of the sub-busbar is 200 μm to 300 μm.
在一些实施例中，每一所述子主栅的宽度为50μm～200μm。In some embodiments, the width of each of the sub-busbars is 50 μm to 200 μm.
在一些实施例中，所述铝副栅的高度为20μm～35μm；所述铝主栅的高度为15μm～25μm。In some embodiments, the height of the aluminum sub-grid is 20 μm to 35 μm; the height of the aluminum main grid is 15 μm to 25 μm.
在一些实施例中，所述背银电极的高度为4μm～8μm。In some embodiments, the height of the back silver electrode is 4 μm to 8 μm.
本实用新型实施例还提供了一种双面PERC太阳能电池，包括硅基底，所述硅基底的正面依次叠设有掺杂层、减反射膜及正电极；所述硅基底的背面依次叠设有钝化层、如上所述的双面PERC太阳能电池的背电极结构。An embodiment of the utility model further provides a double-sided PERC solar cell, comprising a silicon substrate, wherein a doping layer, an anti-reflection film and a positive electrode are sequentially stacked on the front side of the silicon substrate; and a passivation layer and the back electrode structure of the double-sided PERC solar cell as described above are sequentially stacked on the back side of the silicon substrate.
在一些实施例中，所述钝化层上开设有第一激光槽和第二激光槽，所述第一激光槽与所述第二激光槽垂直，所述铝主栅设于所述第一激光槽中，所述铝副栅设于所述第二激光槽中，且所述铝主栅与所述铝副栅与所述硅基底相接触。In some embodiments, a first laser groove and a second laser groove are opened on the passivation layer, the first laser groove is perpendicular to the second laser groove, the aluminum main gate is arranged in the first laser groove, the aluminum sub-gate is arranged in the second laser groove, and the aluminum main gate and the aluminum sub-gate are in contact with the silicon substrate.
本实用新型所提供的双面PERC太阳能电池及其背电极结构具有如下优点：The double-sided PERC solar cell and its back electrode structure provided by the utility model have the following advantages:
本实用新型提供的双面PERC太阳能电池的背电极结构包括栅线电极，所述栅线电极包括多条铝副栅，沿第一方向平行设置；以及至少一条铝主栅，沿第二方向设置；每一所述铝主栅包括间隔设置两个子主栅，每一所述子主栅设有镂空结构；其中，所述第一方向与所述第二方向垂直。本实用新型通过将设置铝主栅的子主栅设置为镂空结构，减少铝浆的用量，减少铝主栅的烧结面积，减少缺陷的形成，提高太阳能电池的转换效率，降低太阳能电池的成本。The back electrode structure of the double-sided PERC solar cell provided by the utility model includes a grid line electrode, the grid line electrode includes a plurality of aluminum sub-grids arranged in parallel along a first direction; and at least one aluminum main grid arranged along a second direction; each of the aluminum main grids includes two sub-main grids arranged at intervals, and each of the sub-main grids is provided with a hollow structure; wherein the first direction is perpendicular to the second direction. The utility model reduces the amount of aluminum paste used, reduces the sintering area of the aluminum main grid, reduces the formation of defects, improves the conversion efficiency of the solar cell, and reduces the cost of the solar cell by setting the sub-main grid of the aluminum main grid to a hollow structure.
附图说明BRIEF DESCRIPTION OF THE DRAWINGS
通过阅读参照以下附图对非限制性实施例所作的详细描述，本实用新型的其它特征、目的和优点将会变得更明显。Other features, objectives and advantages of the present invention will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings.
图1是现有技术中的双面PERC电池的背电极结构的示意图；FIG1 is a schematic diagram of a back electrode structure of a bifacial PERC cell in the prior art;
图2是本申请一实施例的双面PERC电池的背电极结构的示意图；FIG2 is a schematic diagram of a back electrode structure of a bifacial PERC cell according to an embodiment of the present application;
图3是本申请图2中的铝主栅的放大示意图；FIG3 is an enlarged schematic diagram of the aluminum main grid in FIG2 of the present application;
图4是本申请一实施例的双面PERC太阳能电池的铝主栅与背银电极连接的示意图；4 is a schematic diagram of the connection between the aluminum main grid and the back silver electrode of a double-sided PERC solar cell according to an embodiment of the present application;
图5是图4中铝主栅与背银电极连接的放大示意图。FIG. 5 is an enlarged schematic diagram of the connection between the aluminum main grid and the back silver electrode in FIG. 4 .
附图标记：Reference numerals:
1’ 现有技术中的铝副栅1' Aluminum auxiliary grid in the prior art
2’ 现有技术中的铝主栅2' Aluminum main grid in the prior art
1 铝副栅1 Aluminum auxiliary grid
2 铝主栅2 Aluminum main grid
21 子主栅21 Sub-busbar
211 镂空结构211 Hollow structure
2a 粗栅部2a Rough grid
2b 细栅部2b Fine grid
3 背银电极3 Back silver electrode
31 银触角31 Silver Tentacles
具体实施方式Detailed ways
现在将参考附图更全面地描述示例实施方式。然而，示例实施方式能够以多种形式实施，且不应被理解为限于在此阐述的实施方式；相反，提供这些实施方式使得本实用新型将全面和完整，并将示例实施方式的构思全面地传达给本领域的技术人员。在图中相同的附图标记表示相同或类似的结构，因而将省略对它们的重复描述。说明书中的“或”、“或者”均可能表示“和”或者“或”。Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that the present invention will be comprehensive and complete and fully convey the concepts of the example embodiments to those skilled in the art. In the figures, the same reference numerals represent the same or similar structures, and thus their repeated description will be omitted. "or" and "or" in the specification may both mean "and" or "or".
在本申请的表示中，参考术语“一个实施例”、“一些实施例”、“示例”、“具体示例”、或“一些示例”等的表示意指结合该实施例或示例表示的具体特征、结构、材料或者特点包括于本申请的至少一个实施例或示例中。而且，表示的具体特征、结构、材料或者特点可以在任一个或多个实施例或示例中以合适的方式结合。此外，在不相互矛盾的情况下，本领域的技术人员可以将本申请中表示的不同实施例或示例以及不同实施例或示例的特征进行结合和组合。In the representations of the present application, the representations with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics represented in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. Moreover, the represented specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples represented in the present application and the features of the different embodiments or examples, unless they contradict each other.
此外，术语“第一”、“第二”仅用于表示目的，而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量。由此，限定有“第一”、“第二”的特征可以明示或隐含地包括至少一个该特征。在本申请的表示中，“多个”的含义是两个或两个以上，除非另有明确具体的限定。In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the representation of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.
为解决现有技术中双面PERC电池的背电极结构中铝浆烧结面积大导致的电池缺陷增多，进而影响太阳能电池的光电转换效率的问题，本申请实施例提供了一种双面PERC太阳能电池及其背电极结构。图2示出了本申请一实施例的双面PERC太阳能电池的背电极结构的示意图；图3示出了图2中的铝主栅的放大示意图；图4示出了本申请一实施例的双面PERC太阳能电池的铝主栅与背银电极连接的示意图；图5示出了图4中铝主栅与背银电极连接的放大示意图。In order to solve the problem that the large sintering area of aluminum paste in the back electrode structure of the bifacial PERC cell in the prior art leads to an increase in cell defects, thereby affecting the photoelectric conversion efficiency of the solar cell, the embodiment of the present application provides a bifacial PERC solar cell and its back electrode structure. Figure 2 shows a schematic diagram of the back electrode structure of a bifacial PERC solar cell in an embodiment of the present application; Figure 3 shows an enlarged schematic diagram of the aluminum main grid in Figure 2; Figure 4 shows a schematic diagram of the connection between the aluminum main grid and the back silver electrode of the bifacial PERC solar cell in an embodiment of the present application; Figure 5 shows an enlarged schematic diagram of the connection between the aluminum main grid and the back silver electrode in Figure 4.
如图2至图5所示，双面PERC太阳能电池的背电极结构包括栅线电极，栅线电极包括多条铝副栅1，沿第一方向平行设置；以及至少一条铝主栅2，沿第二方向设置；每一铝主栅2包括间隔设置的两个子主栅21，每一子主栅21设有镂空结构211；其中，第一方向与第二方向垂直。此处第一方向为从纸面看上去的左右方向，第二方向为从纸面看上去的上下方向。As shown in Figures 2 to 5, the back electrode structure of the bifacial PERC solar cell includes a grid electrode, which includes a plurality of aluminum sub-grids 1 arranged in parallel along a first direction; and at least one aluminum main grid 2 arranged along a second direction; each aluminum main grid 2 includes two sub-main grids 21 arranged at intervals, and each sub-main grid 21 is provided with a hollow structure 211; wherein the first direction is perpendicular to the second direction. Here, the first direction is the left-right direction viewed from the paper surface, and the second direction is the up-down direction viewed from the paper surface.
通过将形成铝主栅的子主栅设置为镂空结构，铝主栅的面积减小，进而可以减少铝主栅的烧结面积，减少太阳能电池缺陷形成，减少太阳能电池的复合，提高太阳能电池的转换效率，还可以降低背面铝浆的用量，降低太阳能电池的成本。By setting the sub-main grid that forms the aluminum main grid as a hollow structure, the area of the aluminum main grid is reduced, which in turn can reduce the sintering area of the aluminum main grid, reduce the formation of solar cell defects, reduce the recombination of solar cells, improve the conversion efficiency of solar cells, and reduce the amount of aluminum paste used on the back, thereby reducing the cost of solar cells.
具体地，在一些实施例中，每一铝副栅1的宽度为80μm～120μm。示例性地可以为80μm、85μm、90μm、95μm、100μm、105μm、110μm、115μm或120μm，但不限于此。铝副栅的高度为20μm～35μm，例如可以为20μm、23μm、26μm、29μm、32μm或35μm，但不限于此。Specifically, in some embodiments, the width of each aluminum sub-grid 1 is 80 μm to 120 μm. For example, it can be 80 μm, 85 μm, 90 μm, 95 μm, 100 μm, 105 μm, 110 μm, 115 μm or 120 μm, but not limited thereto. The height of the aluminum sub-grid is 20 μm to 35 μm, for example, it can be 20 μm, 23 μm, 26 μm, 29 μm, 32 μm or 35 μm, but not limited thereto.
在一些实施例中，每一铝主栅2的宽度为400μm～600μm。示例性地可以为400μm、450μm、500μm、550μm或600μm，但不限于此。铝主栅的高度为15μm～25μm，示例性地可以为15μm、17μm、19μm、21μm、23μm或25μm，但不限于此。In some embodiments, the width of each aluminum main grid 2 is 400 μm to 600 μm, and may be 400 μm, 450 μm, 500 μm, 550 μm or 600 μm, but not limited thereto. The height of the aluminum main grid is 15 μm to 25 μm, and may be 15 μm, 17 μm, 19 μm, 21 μm, 23 μm or 25 μm, but not limited thereto.
本实施例中，每一子主栅21的镂空结构211的宽度为200μm～300μm。示例性地可以为200μm、220μm、240μm、260μm、280μm或300μm，但不限于此。本实施例中将子主栅设置为镂空结构，可减少约40％的铝浆用量。铝主栅2的镂空结构不限于本申请中提供的镂空结构，在其他一些实施例中，也可以为其他结构的镂空图案，例如相连接的圆形镂空图案、相连接的方形镂空图案、相连接的菱形镂空结构等。In this embodiment, the width of the hollow structure 211 of each sub-busbar 21 is 200μm to 300μm. Exemplarily, it can be 200μm, 220μm, 240μm, 260μm, 280μm or 300μm, but it is not limited thereto. In this embodiment, the sub-busbar is set as a hollow structure, which can reduce the amount of aluminum paste by about 40%. The hollow structure of the aluminum busbar 2 is not limited to the hollow structure provided in this application. In some other embodiments, it can also be a hollow pattern of other structures, such as connected circular hollow patterns, connected square hollow patterns, connected diamond hollow structures, etc.
在一些实施例中，每一子主栅21的宽度为50μm～200μm，示例性地可以为50μm、100μm、150μm或200μm，但不限于此。In some embodiments, the width of each sub-busbar 21 is 50 μm to 200 μm, and may be 50 μm, 100 μm, 150 μm or 200 μm, but is not limited thereto.
请继续参阅图2和图3，铝主栅2包括沿第二方向间隔设置的粗栅部2a和细栅部2b；如图4和图5所示，背电极结构还包括背银电极3，背银电极3设有银触角31，背银电极3位于粗栅部2a，背银电极3置于粗栅部2a，背银电极3通过银触角31与铝主栅2电连接。铝主栅可实现电流的有效收集，同时增大后期与焊带的接触面积，提升焊接拉力；背银电极设置主要是提供后期与焊带的连接点。通过铝主栅和背银电极，可实现载流子汇流、电流导出以及与焊带稳固焊接的效果。Please continue to refer to Figures 2 and 3. The aluminum main grid 2 includes a coarse grid portion 2a and a fine grid portion 2b arranged at intervals along the second direction; as shown in Figures 4 and 5, the back electrode structure also includes a back silver electrode 3, and the back silver electrode 3 is provided with a silver antenna 31. The back silver electrode 3 is located in the coarse grid portion 2a, and the back silver electrode 3 is placed in the coarse grid portion 2a. The back silver electrode 3 is electrically connected to the aluminum main grid 2 through the silver antenna 31. The aluminum main grid can realize effective current collection, while increasing the contact area with the welding strip in the later stage and improving the welding tension; the back silver electrode is mainly provided to provide a connection point with the welding strip in the later stage. Through the aluminum main grid and the back silver electrode, the effects of carrier convergence, current extraction and stable welding with the welding strip can be achieved.
在一些实施例中，背银电极3的高度为4μm～8μm，示例性地可以为4μm、5μm、6μm、7μm或8μm，但不限于此。In some embodiments, the height of the back silver electrode 3 is 4 μm to 8 μm, and illustratively may be 4 μm, 5 μm, 6 μm, 7 μm or 8 μm, but is not limited thereto.
本申请实施例还提供了一种双面PERC太阳能电池，包括硅基底，硅基底的正面依次叠设有掺杂层、减反射膜及正电极；硅基底的背面依次叠设有钝化层和如上的双面PERC太阳能电池的背电极结构。此处的正面与背面为相对与朝向太阳光照射的方向来说，将朝向太阳光的一面称为正面，将背离太阳光的一面称为背面。双面PERC太阳能电池可使得电池的前后表面均可吸收光线，实现双面发电，提高太阳能电池的转换效率，扩大太阳能电池的应用范围。The embodiment of the present application also provides a double-sided PERC solar cell, including a silicon substrate, the front side of the silicon substrate is sequentially stacked with a doping layer, an anti-reflection film and a positive electrode; the back side of the silicon substrate is sequentially stacked with a passivation layer and the back electrode structure of the double-sided PERC solar cell as above. The front side and the back side here are relative to the direction of sunlight. The side facing the sunlight is called the front side, and the side away from the sunlight is called the back side. The double-sided PERC solar cell allows the front and back surfaces of the cell to absorb light, realizes double-sided power generation, improves the conversion efficiency of the solar cell, and expands the application range of the solar cell.
本申请中的双面PERC太阳能电池的背电极结构铝主栅上设有镂空结构，因此铝浆烧结面积少，硅向铝中扩散的面积减小，减少硅基底表面缺陷，可减少电池缺陷，减少复合，进而提高太阳能电池的转换效率；铝主栅设置为镂空结构，还可以减少铝浆的使用量，降低太阳能电池的成本。The back electrode structure of the double-sided PERC solar cell in the present application is provided with a hollow structure on the aluminum main grid, so that the sintering area of the aluminum paste is small, the area of silicon diffusion into the aluminum is reduced, the surface defects of the silicon substrate are reduced, the cell defects can be reduced, the recombination is reduced, and the conversion efficiency of the solar cell is improved; the aluminum main grid is set as a hollow structure, which can also reduce the use of aluminum paste and reduce the cost of solar cells.
双面PERC太阳能电池的钝化层可以为氧化铝或氮化硅的至少一种。钝化层为绝缘层，为使栅线电极与硅基底形成电接触，钝化层上开设有第一激光槽和第二激光槽，第一激光槽与第二激光槽垂直，通过丝网印刷技术将铝主栅设于第一激光槽中，铝副栅设于第二激光槽中，且铝主栅与铝副栅与硅基底相接触。铝主栅与所述铝副栅通与硅基底相接触，形成欧姆接触，从而实现导电功能。The passivation layer of the bifacial PERC solar cell can be at least one of aluminum oxide or silicon nitride. The passivation layer is an insulating layer. In order to make the gate electrode form electrical contact with the silicon substrate, the passivation layer is provided with a first laser groove and a second laser groove. The first laser groove is perpendicular to the second laser groove. The aluminum main grid is arranged in the first laser groove by screen printing technology, and the aluminum sub-grid is arranged in the second laser groove, and the aluminum main grid and the aluminum sub-grid are in contact with the silicon substrate. The aluminum main grid and the aluminum sub-grid are in contact with the silicon substrate to form an ohmic contact, thereby realizing the conductive function.
本实用新型所提供的双面PERC太阳能电池及其背电极结构具有如下优点：The double-sided PERC solar cell and its back electrode structure provided by the utility model have the following advantages:
本实用新型提供的双面PERC太阳能电池的背电极结构包括栅线电极，所述栅线电极包括多条铝副栅，沿第一方向平行设置；以及至少一条铝主栅，沿第二方向设置；每一所述铝主栅包括间隔设置两个子主栅，每一所述子主栅设有镂空结构；其中，所述第一方向与所述第二方向垂直。本实用新型通过将设置铝主栅的子主栅设置为镂空结构，减少铝浆的用量，减少铝主栅的烧结面积，减少缺陷的形成，提高太阳能电池的转换效率，降低太阳能电池的成本。The back electrode structure of the double-sided PERC solar cell provided by the utility model includes a grid line electrode, the grid line electrode includes a plurality of aluminum sub-grids arranged in parallel along a first direction; and at least one aluminum main grid arranged along a second direction; each of the aluminum main grids includes two sub-main grids arranged at intervals, and each of the sub-main grids is provided with a hollow structure; wherein the first direction is perpendicular to the second direction. The utility model reduces the amount of aluminum paste used, reduces the sintering area of the aluminum main grid, reduces the formation of defects, improves the conversion efficiency of the solar cell, and reduces the cost of the solar cell by setting the sub-main grid of the aluminum main grid to a hollow structure.
以上内容是结合具体的优选实施方式对本实用新型所作的进一步详细说明，不能认定本实用新型的具体实施只局限于这些说明。对于本实用新型所属技术领域的普通技术人员来说，在不脱离本实用新型构思的前提下，还可以做出若干简单推演或替换，都应当视为属于本实用新型的保护范围。The above contents are further detailed descriptions of the present invention in combination with specific preferred implementations, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322883272.8UCN221125956U (en) | 2023-10-25 | 2023-10-25 | Double-sided PERC solar cell and back electrode structure thereof |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322883272.8UCN221125956U (en) | 2023-10-25 | 2023-10-25 | Double-sided PERC solar cell and back electrode structure thereof |
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| CN221125956Utrue CN221125956U (en) | 2024-06-11 |
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| CN202322883272.8UActiveCN221125956U (en) | 2023-10-25 | 2023-10-25 | Double-sided PERC solar cell and back electrode structure thereof |
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