A new method for grooving front grid line electrode of crystalline silicon solar cell and manufacturing method of the solar cell

Abstract

The invention discloses a novel method for slotting a front grid line electrode of a crystalline silicon solar battery and a manufacturing method of the solar battery. The crystalline silicon solar battery comprises a crystalline silicon P-N knot substrate, a back electrode, a front grid electrode and a reflection reduction layer, wherein the front grid electrode is in ohmic contact with the N zone of the crystalline silicon P-N knot substrate; the reflection reduction layer is positioned on the surface of the N zone of the crystalline silicon P-N knot substrate. The manufacturing method comprises the following steps: washing and texturing, diffusing, manufacturing knots, washing phosphorus, etching, preparing the back electrode, performing silk-screen printing on a front grid line electrode model, preparing the reflection reduction layer, oxidizing and sintering, and electroplating the front grid line electrode. With the combination of a conventional silk-screen printing technique, an emitter electrode can be slotted, the front grid electrode can be electroplated, oxidized and sintered in a photoinduction manner, and the novel method is convenient to combine with industrial production and has the characteristics of simple production process, high efficiency and high photoelectric conversion efficiency.

Description

technical field [0001] The invention relates to a new method for slotting the front grid electrode of a crystalline silicon solar cell and a manufacturing method of the solar cell, in particular to a crystalline silicon solar cell with high conversion efficiency and a manufacturing method thereof. The field of solar technology. Background technique [0002] In 1839, the French scientist Becquerel discovered that light could generate a potential difference between different parts of a semiconductor material. That is "photovoltaic effect". In 1954, American scientists Chapin and Pearson made a practical monocrystalline silicon solar cell for the first time at Bell Laboratories in the United States, giving birth to a practical photovoltaic power generation technology that converts sunlight energy into electrical energy. After more than half a century of technological improvement, crystalline silicon solar cells still account for 80-90% of the solar power generation market. H...

AI Technical Summary

Problems solved by technology

However, the screen printing technology has the following defects: 1. There is a layer of non-conductive glass between the sintered silver grid electrode and silicon, and the contact resistance is very large; 2. The organic matter in the silver paste evaporates during the sintering process, making the silver electrode It is loose and porous, and the volume resistance of silver electrodes is large; 3. The grid lines of screen printing are generally larger than 80 μm, and it is difficult to reduce the line width, and one printing can only produce a line height of less than 25 μm. It will cause the grid line to be further widened, so the aspect ratio is small, and the wider line width reduces the effective working area of ​​the solar cell, so the shadow loss is large; 4. The silver material itself is expensive

Using lithographic slotting requires photolithography, chemical directional etching or mechanical etching slotting to provide a mask for electroplating, chemical plating or light-induced electroplating, although it solves the problem of large contact resistance and bulk in screen printing. The shortcomings of large resistance and large shadow loss, but the process is too complicated, the production cost is too high, and the equipment production efficiency is low, so it has not been widely used in the industry.

[0005]In short, the existing solar cell production technology is difficult to overcome the shortcomings of large contact resistance, large volume resistance, large shadow loss, high cost, and complicated production process. The substrate only relies on high-temperature sintering to form an insulating glass body to maintain contact. Under vibration or long-term exposure to sunlight, due to lattice mismatch, it is easy to cause metal grid lines to delaminate and cause poor contact, which affects the capture of photogenerated electrons and affects the conversion efficiency of solar cells.

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