Solar cell and assembly and system comprising same

Abstract

The utility model relates to the technical field of solar power generation, and discloses a solar cell, and an assembly and a system comprising the same. The solar cell comprises a silicon substrate layer, a tunneling layer, a first doped polycrystalline silicon layer, a texturing layer, a first electrode and a second electrode, according to the cell, the first groove is formed in the side, away from the silicon substrate layer, of the tunneling layer, and the first groove and the metal contact area are correspondingly arranged in the first direction, so that it is guaranteed that the tunneling layer at the position corresponding to the metal contact area is thin, and therefore it is guaranteed that electrons can tunnel smoothly; the thickness of the tunneling layer at the position corresponding to the non-metal contact area does not need to be the same as that of the tunneling layer at the position corresponding to the metal contact area, so that the tunneling layer at the position corresponding to the non-metal contact area is not easy to damage, and in addition, the texturing layer is beneficial to light transmission of the back surface of the cell, so that light energy absorption is facilitated, and the service life of the cell is prolonged. And the photoelectric conversion efficiency of the cell is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of solar power generation, in particular to a solar cell and a component and a system comprising the solar cell. Background Art

[0002] At present, the tunneling layer of existing solar cells is generally planar in shape, that is, the thickness of each part is uniform. In order to ensure that electrons can smoothly pass through the tunneling layer from the silicon wafer to the electrode, it is usually necessary to limit the thickness of the tunneling layer. Although such a design can make the tunneling layer corresponding to the metal contact area meet the thickness requirements, it also causes the tunneling layer corresponding to the non-metallic contact area to be too thin and easily damaged. Utility Model Content

[0003] The purpose of the utility model is to provide a solar cell and a component and system including the same, which can not only ensure that the tunneling layer at the position corresponding to the metal contact area is thinner, thereby ensuring that electrons can tunnel smoothly, but also make the tunneling layer at the position corresponding to the non-metallic contact area thicker, thereby not being easily damaged.

[0004] In order to achieve the above-mentioned purpose, the utility model provides a solar cell, comprising: a silicon substrate layer, a tunneling layer, a first doped polysilicon layer, a textured layer, a first electrode and a second electrode; the tunneling layer is arranged on one side of the silicon substrate layer in a first direction, the first electrode is arranged on the front side of the battery, and the second electrode is arranged on the back side of the battery; the first doped polysilicon layer is arranged on the side of the tunneling layer away from the silicon substrate layer, and the first doped polysilicon layer has a metal contact area and a non-metallic contact area; the metal contact area in this application refers to the area in the first doped polysilicon layer corresponding to the second electrode in the first direction, and the non-metallic contact area is the area in the first doped polysilicon layer that does not correspond to the second electrode in the first direction; the textured layer is located between the tunneling layer and the silicon substrate layer, and the textured layer is arranged on the silicon substrate layer at the position of the metal contact area corresponding to the first direction; the tunneling layer also has a first groove on the side away from the silicon substrate layer, and the first groove and the metal contact area are arranged correspondingly in the first direction.

[0005] Optionally, the tunneling layer further has a second groove on a side adjacent to the silicon substrate layer, and the second groove and the non-metallic contact area are arranged correspondingly in the first direction.

[0006] Optionally, a side of the first doped polysilicon layer adjacent to the tunneling layer has a protrusion, and the protrusion is located in the first groove.

[0007] Optionally, it further includes a second doped polysilicon layer, wherein the second doped polysilicon layer is arranged on the other side of the silicon substrate layer in the first direction.

[0008] Optionally, it further includes a first anti-reflection layer and a second anti-reflection layer, wherein the first anti-reflection layer is arranged on a side of the first doped polysilicon layer away from the tunneling layer, and the second anti-reflection layer is arranged on a side of the second doped polysilicon layer away from the silicon substrate layer.

[0009] Optionally, it includes a plurality of the first electrodes and a plurality of the second electrodes, wherein the plurality of the first electrodes are arranged at intervals along the second direction on the front side of the battery, and the plurality of the second electrodes are arranged at intervals along the second direction on the back side of the battery, and the plurality of the first electrodes and the plurality of the second electrodes are arranged in one-to-one correspondence.

[0010] In order to achieve the same purpose, the utility model also provides a solar energy component, including the solar cell as described above.

[0011] In order to achieve the same purpose, the utility model also provides a solar energy system, including the solar energy component as mentioned above.

[0012] Compared with the prior art, the solar cell and the components and systems including the same provided by the utility model have the following beneficial effects: the cell sets a first groove on the side of the tunneling layer away from the silicon substrate layer, and sets the first groove and the metal contact area corresponding to each other in the first direction, so as to ensure that the tunneling layer at the position corresponding to the metal contact area is thinner, thereby ensuring that electrons can tunnel smoothly, and the tunneling layer at the position corresponding to the non-metallic contact area does not need to be the same thickness as the tunneling layer at the position corresponding to the metal contact area, thereby making the tunneling layer at the position corresponding to the non-metallic contact area not easily damaged. In addition, the velvet layer is conducive to light transmission on the back side of the cell, thereby facilitating the absorption of light energy, thereby improving the photoelectric conversion efficiency of the cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a schematic structural diagram of the solar cell according to an embodiment of the utility model;

[0014] Figure 2 is a schematic structural diagram of the first doped polysilicon layer according to an embodiment of the utility model;

[0015] Figure 3 It is a schematic structural diagram of the tunneling layer in an embodiment of the utility model.

[0016] In the figure, 1, silicon substrate layer; 2, tunneling layer; 21, first groove; 22, second groove; 3, first doped polysilicon layer; 31, metal contact area; 32, non-metal contact area; 33, protrusion; 4, velvet layer; 5, first electrode; 6, second electrode; 7, second doped polysilicon layer; 8, first anti-reflection layer; 9, second anti-reflection layer; X, first direction; Y, second direction. DETAILED DESCRIPTION

[0017] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0018] In the description of the present invention, it should be understood that the terms "top", "bottom", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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.

[0019] 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 the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0020] like Figure 1-Figure 3 As shown, a solar cell according to an embodiment of the utility model comprises: a silicon substrate layer 1, a tunneling layer 2, a first doped polysilicon layer 3, a velvet layer 4, a first electrode 5 and a second electrode 6; the tunneling layer 2 is arranged on one side of the silicon substrate layer 1 in a first direction X, the first electrode 5 is arranged on the front side of the battery, and the second electrode 6 is arranged on the back side of the battery; the first doped polysilicon layer 3 is arranged on the side of the tunneling layer 2 away from the silicon substrate layer 1, and the first doped polysilicon layer 3 has a metal contact area 31 and a non-metal contact area 32; the metal contact area 31 in this application refers to is an area in the first doped polysilicon layer 3 corresponding to the second electrode 6 in the first direction X, and the non-metallic contact area 32 is an area in the first doped polysilicon layer 3 that is not corresponding to the second electrode 6 in the first direction X; the textured layer 4 is located between the tunneling layer 2 and the silicon substrate layer 1, and the textured layer 4 is arranged on the silicon substrate layer 1 at a position corresponding to the metal contact area 31 in the first direction X; the tunneling layer 2 also has a first groove 21 on the side away from the silicon substrate layer 1, and the first groove 21 and the metal contact area 31 are arranged correspondingly in the first direction X.

[0021] Based on the above scheme, the battery sets a first groove 21 on the side of the tunneling layer 2 away from the silicon substrate layer 1, and the first groove 21 is set corresponding to the metal contact area 31 in the first direction X to ensure that the tunneling layer 2 at the position corresponding to the metal contact area 31 is thinner, thereby ensuring that electrons can tunnel smoothly, and the tunneling layer 2 at the position corresponding to the non-metallic contact area 32 does not need to be the same thickness as the tunneling layer 2 at the position corresponding to the metal contact area 31, thereby making the tunneling layer 2 at the position corresponding to the non-metallic contact area 32 not easily damaged. In addition, the velvet layer 4 is beneficial to the light transmission of the back of the battery, thereby facilitating the absorption of light energy, thereby improving the photoelectric conversion efficiency of the battery.

[0022] It is particularly noted that when electrons tunnel, they will choose to pass through the thinner tunnel layer 2.

[0023] In some embodiments, the silicon substrate layer 1 is an N-type silicon wafer. In this embodiment, the front side of the battery refers to the side of the battery away from the tunneling layer 2 , and the back side of the battery refers to the side of the battery adjacent to the tunneling layer 2 .

[0024] like Figure 1 and Figure 3 As shown, the tunnel layer 2 further has a second groove 22 on one side adjacent to the silicon substrate layer 1 , and the second groove 22 and the non-metallic contact area 32 are arranged in the first direction X correspondingly.

[0025] In some embodiments, the textured layer 4 is a textured structure extending from the silicon substrate layer 1 .

[0026] like Figure 1 and Figure 3 As shown, in order to improve the conversion efficiency of the battery, the first doped polysilicon layer 3 has a protrusion 33 on one side adjacent to the tunneling layer 2 , and the protrusion 33 is located in the first groove 21 .

[0027] like Figure 1 As shown, in order to improve the conversion efficiency of the battery, a second doped polysilicon layer 7 is further included. The second doped polysilicon layer 7 is arranged on the other side of the silicon substrate layer 1 in the first direction X.

[0028] like Figure 1 As shown, in order to reduce the reflection of sunlight so that the solar cell can better absorb the light from the sun, thereby improving the power generation efficiency, it also includes a first anti-reflection layer 8 and a second anti-reflection layer 9. The first anti-reflection layer 8 is arranged on the side of the first doped polysilicon layer 3 away from the tunneling layer 2, and the second anti-reflection layer 9 is arranged on the side of the second doped polysilicon layer 7 away from the silicon substrate layer 1.

[0029] like Figure 1As shown, for ease of use, it includes a plurality of first electrodes 5 and a plurality of second electrodes 6, wherein the plurality of first electrodes 5 are arranged at intervals along the second direction Y on the front side of the battery, and the plurality of second electrodes 6 are arranged at intervals along the second direction Y on the back side of the battery, and the plurality of first electrodes 5 and the plurality of second electrodes 6 are arranged in one-to-one correspondence.

[0030] The embodiment of the utility model further provides a solar energy component, comprising the solar cell as described above.

[0031] The embodiment of the utility model further provides a solar energy system, comprising the solar energy component as described above.

[0032] In summary, the embodiments of the utility model provide a solar cell and a component and system including the same, which sets a first groove 21 on the side of the tunneling layer 2 away from the silicon substrate layer 1, and sets the first groove 21 and the metal contact area 31 corresponding to each other in the first direction X to ensure that the tunneling layer 2 at the position corresponding to the metal contact area 31 is thinner, thereby ensuring that electrons can tunnel smoothly, and also enables the tunneling layer 2 at the position corresponding to the non-metallic contact area 32 to not have to be the same thickness as the tunneling layer 2 at the position corresponding to the metal contact area 31, thereby making the tunneling layer 2 at the position corresponding to the non-metallic contact area 32 not easily damaged. In addition, the velvet layer 4 is conducive to light transmission on the back of the battery, thereby facilitating the absorption of light energy, thereby improving the photoelectric conversion efficiency of the battery.

[0033] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principle of the present invention. These improvements and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. A solar cell, characterized in that: include: A silicon substrate layer, a tunneling layer, a first doped polysilicon layer, a textured layer, a first electrode and a second electrode; The tunneling layer is arranged on one side of the silicon substrate layer in a first direction, the first electrode is arranged on the front side of the battery, and the second electrode is arranged on the back side of the battery; The first doped polysilicon layer is disposed on a side of the tunnel layer away from the silicon substrate layer, and the first doped polysilicon layer has a metal contact area and a non-metal contact area; The textured layer is located between the tunneling layer and the silicon substrate layer, and the textured layer is arranged on the silicon substrate layer at a position corresponding to the metal contact region in the first direction; The tunnel layer further has a first groove on a side facing away from the silicon substrate layer, and the first groove and the metal contact area are arranged correspondingly in the first direction.

2. The solar cell according to claim 1, characterized in that The tunnel layer further has a second groove on one side adjacent to the silicon substrate layer, and the second groove and the non-metallic contact area are arranged correspondingly in the first direction.

3. The solar cell according to claim 1, characterized in that A side of the first doped polysilicon layer adjacent to the tunneling layer has a protrusion, and the protrusion is located in the first groove.

4. The solar cell according to claim 1, characterized in that It also includes a second doped polysilicon layer, which is arranged on the other side of the silicon substrate layer in the first direction.

5. The solar cell according to claim 4, characterized in that: It also includes a first anti-reflection layer and a second anti-reflection layer. The first anti-reflection layer is arranged on a side of the first doped polysilicon layer away from the tunneling layer, and the second anti-reflection layer is arranged on a side of the second doped polysilicon layer away from the silicon substrate layer.

6. The solar cell according to claim 1, characterized in that It comprises a plurality of the first electrodes and a plurality of the second electrodes, wherein the plurality of the first electrodes are arranged at intervals along a second direction on the front side of the battery, and the plurality of the second electrodes are arranged at intervals along the second direction on the back side of the battery, and the plurality of the first electrodes and the plurality of the second electrodes are arranged in one-to-one correspondence.

7. A solar panel, characterized in that: The invention comprises a solar cell as claimed in any one of claims 1 to 6.

8. A solar energy system, characterized in that: Comprising the solar module as claimed in claim 7.

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