A back contact cell and a back contact cell assembly

CN122180202APending Publication Date: 2026-06-09HENGDIAN GRP DMEGC MAGNETICS CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HENGDIAN GRP DMEGC MAGNETICS CO LTD
Filing Date
2026-05-12
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

In back-contact batteries, the abrupt change from a polished surface to a uniform textured surface at the side edge of the battery leads to low carrier transport efficiency, poor light absorption in the edge region, and problems such as leakage, carrier accumulation, and blockage.

Method used

A textured surface structure with gradient variations is designed in the edge region of the back contact battery, including transition texture, smooth texture and boundary texture. By setting pyramid structures of different sizes, a smooth transition of charge carriers is achieved and the light absorption effect is optimized.

Benefits of technology

It improves carrier transport efficiency, enhances absorption of short-wavelength light, reduces edge leakage and stress concentration, and improves the photoelectric conversion efficiency and reliability of the battery.

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Abstract

This disclosure relates to the field of solar cell technology, and discloses a back-contact cell and a back-contact cell assembly. The back-contact cell includes: a substrate layer, a first doped semiconductor layer, and a second doped semiconductor layer; the back surface of the substrate layer includes a first region, a second region, and an edge region; the first doped semiconductor layer is located on the surface of the first region, and the second doped semiconductor layer is located on the surface of the second region; along any side of the substrate layer, the edge region sequentially includes a transition textured region, a smooth textured region, and a boundary textured region; wherein, the average feature size of the first textured structure in the transition textured region is larger than the average feature size of the second textured structure in the smooth textured region, and the average feature size of the third textured structure in the boundary textured region is smaller than the average feature size of the second textured structure. This disclosure can avoid leakage at the cell edge, improve carrier transport efficiency, reduce the probability of cell breakage, and improve the electrical performance and reliability of the cell.
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