Photovoltaic cell and preparation method thereof

By designing a pyramid suede region with a first curved surface and a conical structure on the front of the silicon substrate of the photovoltaic cell, the problem of insufficient reflectivity of the existing photovoltaic cell is solved, and the light utilization rate and battery efficiency are improved.

CN119730482APending Publication Date: 2025-03-28ZHEJIANG JINKO SOLAR CO LTD
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Patent Information

Application Number
CN202510024620.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-01-07
Publication Date
2025-03-28

AI Technical Summary

Technical Problem

The reflectivity of existing photovoltaic cells still has room for a decrease, resulting in insufficient light absorption and affecting battery efficiency.

Method used

A photovoltaic cell is designed, and the front face of the silicon substrate has a first suede region and a second suede region. The first suede region includes a first pyramid structure, and its sides are a first curved surface with a gradually increasing curvature. The second suede region includes a second pyramid of a conical structure. With this structure, the number of reflections and refractions of light on the first curved surface increases, thereby increasing the utilization rate of light.

Benefits of technology

The utilization rate of photovoltaic cells for light is improved, the short-circuit current and conversion efficiency are enhanced, and the filling factor and efficiency of the battery are further improved by optimizing the design of passivation layer and electrode assembly.

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Abstract

The invention relates to a photovoltaic cell and a preparation method of the photovoltaic cell. The photovoltaic cell comprises a silicon substrate, a passivation contact structure and an electrode assembly, the front face of the silicon substrate is provided with a first textured area and a second textured area, the first textured area comprises a plurality of first pyramid structures, one side face of each first pyramid structure is a first curved surface, and the passivation contact structure is arranged in the direction from the top of the first curved surface to the bottom of the first curved surface. The curvature of the first curved surface is gradually increased, and the second suede area comprises a plurality of conical second pyramid structures; the passivation contact structure is arranged on the back surface of the silicon substrate; the electrode assembly comprises a first electrode and a second electrode, the first electrode is arranged in the second suede area, and the second electrode is electrically connected with the passivation contact structure. Through the arrangement, light rays can be reflected and refracted for multiple times in the direction from the top to the bottom of the first curved surface, and the light ray utilization rate is increased; the first electrode is arranged on the conical second pyramid structure, so that the filling factor is improved, and the conversion efficiency of the photovoltaic cell is improved.
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