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EP-4572568-B1 - SOLAR CELL, METHOD FOR MANUFACTURING THE SAME, AND PHOTOVOLTAIC MODULE

EP4572568B1EP 4572568 B1EP4572568 B1EP 4572568B1EP-4572568-B1

Inventors

  • ZHENG, LIHUA
  • XU, MENGLEI
  • FENG, Xiu
  • YANG, JIE
  • Zhang, Xinyu

Dates

Publication Date
20260513
Application Date
20241213

Claims (14)

  1. A solar cell (300), comprising: a substrate (100) having a front side (101) and a back side (102) opposite to each other; a first doped layer (110) and a second doped layer (120) alternately arranged along a first direction (X) on the back side (101); wherein the first doped layer (110) and the second doped layer (120) adjacent to the first doped layer are separated by an isolation region (103); a doping type of the first doped layer (110) is different from a doping type of the second doped layer (120); a portion of the back side (102) located at the isolation region (103) is exposed; the first doped layer (110) has a first slope sidewall (111) facing the isolation region (103), and the second doped layer (120) has a second slope sidewall (121) facing the isolation region (103); and a first electrode (130) and a second electrode (140), the first electrode (130) being in electrical contact with the first doped layer (110), and the second electrode (140) being in electrical contact with the second doped layer (120); characterized in that , in a direction away from the back side (102) of the substrate (100), the first slope sidewall (111) comprises a first sub-slope sidewall (1111), a platform surface (1112), and a second sub-slope sidewall (1113) connected in sequence.
  2. The solar cell according to claim 1, wherein an angle between the first sub-slope sidewall (1111) and a surface of the first doped layer (110) facing the back side (102) is the same as an angle between the second sub-slope sidewall (1113) and the surface of the first doped layer (110) facing the back side (102) and is a first angle ( a ), and the first angle is an acute angle; and an angle between the second sloped sidewall (121) and a surface of the second doped layer (120) facing the back side (102) is a second angle ( b ), and the second angle is an acute angle.
  3. The solar cell according to claim 2, wherein the first angle ( a ) is less than or equal to the second angle (b) .
  4. The solar cell according to claim 2 or 3, wherein the first angle ( a ) in a range from 25° to 60°, and the second angle ( b ) is in a range from 30° to 65°.
  5. The solar cell according to claim 1, wherein the portion of the back side (102) uncovered by the isolation region (103) has a textured structure (104), and the textured structure (104) comprises a plurality of pyramid-shaped structures.
  6. The solar cell according to claim 5, wherein, a width of a bottom surface of each pyramid-shaped structure in a direction parallel to the back side (102) is in a range from 2µm to 4µm.
  7. The solar cell according to claim 1, wherein in a direction perpendicular to the back side (102) of the substrate (100), a distance between a surface of the first doped layer (110) away from the substrate (100) and the front side (101) of the substrate (100) is greater than a distance between a surface of the second doped layer (120) away from the substrate (100) and the front side (101) of the substrate (100), and the platform surface is closer to the back side (102) than the surface of the second doped layer (120) away from the substrate (100) is.
  8. The solar cell according to claim 1 or 7, wherein in a direction perpendicular to the back side (102) of the substrate (100), a thickness of the second sub-slope sidewall is less than a thickness of the first sub-slope sidewall.
  9. The solar cell according to claim 1 or 7, wherein a slope of the second sub-slope sidewall relative to the back side (102) is greater than a slope of the first sub-slope sidewall relative to the back side (102).
  10. The solar cell according to claim 1, wherein in a direction perpendicular to the back side (102) of the substrate (100), a distance between a surface of the first doped layer (110) away from the substrate (100) and the front side (101) of the substrate (100) is less than or equal to a distance between a surface of the second doped layer (120) away from the substrate (100) and the front side (101) of the substrate (100).
  11. The solar cell according to claim 1, wherein the first sloped sidewall (111) is a continuous slope.
  12. The solar cell according to claim 1, wherein the second sloped sidewall (121) is a continuous slope.
  13. The solar cell according to claim 1, wherein a doping ion in the first doped layer (110) comprises a boron ion, and a doping ion in the second doped layer (120) comprises a phosphorus ion.
  14. A photovoltaic module, characterized by comprising: a cell string formed by electrically connecting a plurality of solar cells (300) of any one of claims 1 to 13; a packaging film (310) configured to cover a surface of the cell string; and a cover plate (320) configured to cover a surface of the packaging film (310) away from the cell string.

Description

TECHNICAL FIELD The embodiments of the present invention relate to the photovoltaic field, and in particular to a solar cell, a method for manufacturing the same, and a photovoltaic module. BACKGROUND At present, with a gradual depletion of fossil energy, solar cells, as a new alternative energy, are becoming more and more widely used. The solar cells are devices that convert sunlight into electrical energy. The solar cells generate carriers based on the photovoltaic principle, and then use electrodes to lead the carriers out, thereby making use of electrical energy effectively. The existing solar cells mainly include single-layer cells, such as Interdigitated Back Contact (IBC) cells, Tunnel Oxide Passivated Contact (TOPCON) cells, Passivated emitter and rear cells (PERCs), Heterojunction with Intrinsic Thin-layer/Heterojunction Technology (HIT/HJT) cells, and perovskite cells. Arrangements of different film layers and functional limitations are adopted to reduce optical losses and reduce the recombination of photogenerated carriers on a surface of and in the inner part of a silicon substrate to improve the photoelectric conversion efficiency of the solar cell. Document CN105609571A discloses an IBC solar cell and a method for manufacturing the same. However, the light utilization rate of the IBC cell still needs to be improved. SUMMARY Embodiments of the present invention provide a solar cell, a method for manufacturing the same, and a photovoltaic module, which at least have beneficial effects of improving the light utilization rate of the solar cell. According to some embodiments of the present invention, on one hand, an embodiment of the present invention provides a solar cell, including: a substrate having a front side and a back side opposite to each other, a first doped layer and a second doped layer alternately arranged along a first direction on the back side, and a first electrode and a second electrode. The first doped layer and the second doped layer adjacent to the first doped layer are separated by an isolation region. A doping type of the first doped layer is different from a doping type of the second doped layer. A portion of the back side located at the isolation region is exposed. The first doped layer has a first slope sidewall facing the isolation region, and the second doped layer has a second slope sidewall facing the isolation region. The first electrode is in electrical contact with the first doped layer, and the second electrode is in electrical contact with the second doped layer. In a direction away from the back side of the substrate, the first slope sidewall includes a first sub-slope sidewall, a platform surface, and a second sub-slope sidewall connected in sequence. In some embodiments, an angle between the first sloped sidewall and a surface of the first doped layer facing the back side is a first angle, and the first angle is an acute angle; and an angle between the second sloped sidewall and a surface of the second doped layer facing the back side is a second angle, and the second angle is an acute angle. In some embodiments, the first angle is less than or equal to the second angle. In some embodiments, the first angle in a range from 25° to 60°, and the second angle is in a range from 30° to 65°. In some embodiments, the portion of the back side exposed uncovered by the isolation region has a textured structure, and the textured structure includes a plurality of pyramid-shaped structures. In some embodiments, a width of a bottom surface of each pyramid-shaped structure in a direction parallel to the back side is in a range from 2µm to 4µm. In some embodiments, in a direction perpendicular to the back side of the substrate, a distance between a surface of the first doped layer away from the substrate and the front side of the substrate is greater than a distance between a surface of the second doped layer away from the substrate and the front side of the substrate, and the platform surface is closer to the back side than the surface of the second doped layer away from the substrate is. In some embodiments, in a direction perpendicular to the back side of the substrate, a thickness of the second sub-slope sidewall is less than a thickness of the first sub-slope sidewall. In some embodiments, a slope of the second sub-slope sidewall relative to the back side is greater than a slope of the first sub-slope sidewall relative to the back side. In some embodiments, in a direction perpendicular to the back side of the substrate, a distance between a surface of the first doped layer away from the substrate and the front side of the substrate is less than or equal to a distance between a surface of the second doped layer away from the substrate and the front side of the substrate. In some embodiments, the first sloped sidewall is a continuous slope. In some embodiments, the second sloped sidewall is a continuous slope. In some embodiments, a doping ion in the first doped layer incl