MWT back contact type efficient photovoltaic battery and production process

Abstract

The invention discloses an MWT back contact type efficient photovoltaic battery. The MWT back contact type efficient photovoltaic battery comprises, orderly from a light facing surface to a backlightsurface, a coated glass layer, an EVA layer, a battery piece layer, an insulating layer, a back passivation layer, an EVA layer and a back plate layer, and the battery piece layer comprises a plurality of battery pieces which are uniformly distributed, wherein the light-facing surface of each battery piece is provided with a front electrode, the front electrode comprises N * N minimum repetitive units which are uniformly distributed, and an electrode point is arranged in the center of each minimum repetitive unit; a plurality of grid lines are arranged in each minimum repetitive unit and are connected with the electrode point, and the included angles between any two adjacent grid lines are equal. The invention further discloses a production process of the MWT back contact type efficient photovoltaic battery. According to the invention, the carrier collection efficiency is high, the battery conversion efficiency can be improved by 2%, the carrier transmission time is short, and the carrier recombination can be avoided.

Description

technical field [0001] The invention relates to the technical field of photovoltaic cells, in particular to a MWT back-contact high-efficiency photovoltaic cell and a production process. Background technique [0002] As a clean and renewable energy source, solar energy has been valued by many countries and regions. Experts predict that in the 21st century, solar photovoltaic green energy will become the main energy used by human beings. The successful development of key technologies for high-efficiency back-contact photovoltaic products will undoubtedly further promote the development of solar power generation. [0003] MWT technology is a metal winding penetration technology, and it is a technology without busbars and back contact electrodes. MWT technology has many advantages. First, the consumption of silver paste is reduced; second, the shading is reduced by 3%-4%, whether it is a monocrystalline or polycrystalline cell, the efficiency is increased by 0.4-0.6%; third, ...

AI Technical Summary

Problems solved by technology

[0004] On the front electrode of the existing MWT photovoltaic cells, multiple main grids are generally arranged on the electrode points, and several uniformly arranged sub-grids are connected to the main grid lines. connected, it takes a long time for the carriers collected on the sub-gate to be transported to the main gate, and the width of the sub-gate is smaller than the width of the main gate, and the influence of carrier recombination on the sub-gate gradually becomes prominent

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