Two-dimensional electrode of crystalline silicon solar cell and preparation method of two-dimensional electrode

Abstract

The invention discloses a two-dimensional electrode of a crystalline silicon solar cell and a preparation method of the two-dimensional electrode. The two-dimensional electrode is arranged on the front surface and / or the back surface of the crystalline silicon cell and comprises local contact metal electrodes, a transparent conductive film and metal electrodes, wherein the local contact metal electrodes are arranged on an antireflection film / passivating film in a regular pattern manner; the metal electrodes penetrate through the antireflection film / passivating film; the metal electrodes and a crystalline silicon wafer form local ohmic contact; the transparent conductive film is arranged on the antireflection film / passivating film and the local contact metal electrodes; the metal electrodes are arranged on the transparent conductive film; and the metal electrodes at the upper part and the lower part of the transparent conductive film are connected into a conductive assembly of the electrode of the crystalline silicon solar cell by the transparent conductive film. By the electrode, the light shading area of the metal electrodes and the usage amount of slurry are significantly reduced; meanwhile, good conductivity of the electrode is ensured; the dilemma between the light shielding property and the conductivity of the crystalline silicon electrode is well balanced; the conversion efficiency of the cell is improved; and the production cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of solar cells, in particular to a two-dimensional electrode of a crystalline silicon solar cell and a preparation method thereof. Background technique [0002] Since the first solar cell was born in Bell Laboratories in 1954, crystalline silicon solar cells have been widely used, the conversion efficiency has been continuously improved, and the production cost has continued to decline. At present, crystalline silicon solar cells account for more than 80% of the total global solar cell market, and the conversion efficiency of crystalline silicon cell production lines has exceeded 20%. The cost of electricity continues to shrink and is expected to be flat in the next few years. As a clean energy source, crystalline silicon solar cells play an increasingly important role in changing the energy structure and alleviating environmental pressure. [0003] If crystalline silicon solar cells want to continue to ma...

AI Technical Summary

Problems solved by technology

Some people propose to use a transparent conductive film to replace the metal fine grid, but because this method still retains the main grid, the reduction of the light-shielding area of ​​the electrode is limited, and the cancellation of the thin grid will cause poor conductivity and affect the conversion efficiency.

Some people use transparent conductive films with different conductivity to completely replace the metal electrodes and anti-reflection films on the light-receiving surface, but this method has not been mass-produced for more than ten years since it was proposed.

Some people apply transparent conductive film to MWT technology, but the implementation process is complicated, and it is not easy to control and reduce costs

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