Positive electrode of solar cell

Abstract

The invention discloses a positive electrode of a solar cell, which comprises main grid lines (1) arranged in parallel and fine grid lines (2) arranged in a honeycomb hexagonal shape, wherein the hexagonal sides of the fine grid lines (2) contract or extend according to grid line density requirements in order to meet conductivity requirements of square resistance, and the main grid lines (1) and the fine grid lines (2) have an overlapping part therebetween. Therefore, a non-knotless screen printing plate can be used on the one hand, so that the production cost is greatly reduced; and on the other hand, better conductivity is provided, the loss of grid lines on a positive plate is greatly reduced, the conversion efficiency of current is improved, and thus the service life is ensured.

Description

technical field [0001] The invention relates to the technical field of solar cells, in particular to a solar cell positive electrode. Background technique [0002] Solar cells, also known as "solar chips" or "photovoltaic cells", are photoelectric semiconductor sheets that use sunlight to generate electricity directly. The electrode located under the solar cell is generally called the positive electrode of the solar cell. It consists of a main grid line and a thin grid line perpendicular to the main grid line. The thin grid line is used to collect current and transmit it to the main grid line, and then welded to the main grid line The ribbon on the wire draws the current out. The distribution of grid lines on the positive electrode of traditional solar cells is usually single, that is, several main grid lines arranged side by side, and multiple parallel thin grid lines perpendicular to the main grid lines, which is equivalent to forming a grid. picture of. The disadvantag...

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Problems solved by technology

[0003] 1) Under normal circumstances, the main grid lines and thin grid lines occupy a certain area of ​​the cell, which tends to cause a large shading loss and reduce the conversion efficiency of the solar cell. Therefore, in order to reduce the shading loss and properly improve the solar cell The general design is to increase the number of thin grid lines and the number of main grid lines to adjust the conductivity of the sheet, but the increase in the number of grid lines will inevitably require the width of the grid lines to be reduced, so that the grid lines will become thinner and thinner , however, the finer and thinner the grid lines, the higher the square resistance of the silicon surface will be, resulting in larger surface resistance and surface line loss;

[0004] 2) The finer and thinner grid lines are easy to cause problems such as disconnection, which will cause poor EL, and long-term use of this solar cell will inevitably lead to serious power attenuation and voltage instability.

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