Back contact cells, cell assemblies and photovoltaic systems

By designing a dielectric layer with regionalized pore density and size differences on the back side of the back contact battery, combined with p-type and n-type doped layers and an isolation layer, the field passivation and interface passivation effects of the back contact battery are optimized, thereby improving the battery's performance and efficiency.

CN122514079APending Publication Date: 2026-08-04ZHEJIANG AIKO SOLAR ENERGY TECH CO LTD +3
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Patent Information

Application Number
CN202610653490.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-05-12
Publication Date
2026-08-04

AI Technical Summary

Technical Problem

In existing back-contact battery technology, the overall optimization of the tunneling layer has failed to differentiate the design for different functional areas, resulting in poor passivation effect and limiting the improvement of battery efficiency.

Method used

Different pore densities and sizes are designed on the back of the back contact battery. Combined with the distribution of p-type doped layer, n-type doped layer and isolation layer, the p-region and n-region are isolated by the isolation layer to optimize the field passivation and interface passivation effects.

Benefits of technology

It improves carrier collection efficiency, reduces nonradiative recombination loss of photogenerated carriers at the isolation boundary, increases the open-circuit voltage and overall photoelectric conversion efficiency of the battery, and avoids etching damage to the silicon substrate.

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Abstract

The application relates to the technical field of solar cells, and provides a back contact cell, a cell assembly and a photovoltaic system. In the back contact cell, a first medium layer comprises a first part located on a first region, a second part located on a second region and a third part located on an isolation region; a p-type doped layer is arranged on the first part; an n-type doped layer is arranged on the second part; an isolation layer is arranged on the third part; the distribution density of first holes is greater than that of third holes; the distribution density of second holes is greater than that of the third holes; and the size of the third holes is smaller than that of the first holes and / or the size of the third holes is smaller than that of the second holes. In this way, by specifically differentiating the hole density and the hole size on different parts of the corresponding part region of the first medium layer, the combination of relatively optimal performance can be achieved as a whole, and the performance and conversion effect of the back contact cell are improved.
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