Preparation method of double-side power generation heterojunction solar cell

Abstract

The invention discloses a preparation method of a double-side power generation heterojunction solar cell. The method comprises that a) two sides of an N type silicon chip are textured to form pyramid suede; b) a first intrinsic amorphous silicon thin film layer and an N type amorphous silicon thin film layer are deposited at one side of the textured N type silicon chip, and a second intrinsic amorphous silicon thin film layer and a P type amorphous silicon thin film layer are deposited at the other side; c) transparent conductive thin film layers are deposited on the N type amorphous silicon thin film layer and the P type amorphous silicon thin film layer respectively; d) metal layers are deposited on the transparent conductive thin film layers at the two sides of the N type silicon chip; e) metal grid-line electrodes are formed on the metal layers at the two sides of the N type silicon chip; and f) metal layers beyond a metal-grid line electrode area are removed. According to the method, low-temperature metal makes good contact with transparent conductive films, high-molecular shielding layers in the edges of metal grid lines can be removed, the serial connection resistance of the cell can be reduced, effective absorption light of the solar cell is increased, and further, the conversion efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of solar cells, in particular to a method for preparing a double-sided power generation heterojunction solar cell. Background technique [0002] A solar cell is a semiconductor device that can convert solar energy into electrical energy. Under the condition of light, a photogenerated current will be generated inside the solar cell, and the electrical energy will be output through the electrodes. In recent years, the production technology of solar cells has been continuously improved, the production cost has been continuously reduced, and the conversion efficiency has been continuously improved. The application of photovoltaic power generation has become increasingly widespread and has become an important energy source for power supply. [0003] Crystalline silicon solar cells have the advantages of high photoelectric conversion efficiency and mature production technology, and have always occupied the vast ma...

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Problems solved by technology

[0006] From the above preparation process, the preparation process of heterojunction solar cells is carried out at 220 degrees, and the silver paste electrodes of traditional monocrystalline silicon or polycrystalline silicon cells are sintered at a high temperature above 600 degrees, and the silver paste electrodes and silicon wafers are easy to form ohmic contacts. However, the low-temperature silver paste screen printing process used for heterojunction solar cells cannot be sintered and solidified at a high temperature of 600 degrees, resulting in the inability to form a good ohmic contact between the silver paste electrode and the transparent conductive film, and the silver paste after low temperature curing The paste grid line will form a layer of polymer shielding layer on the edge of the grid line, thereby increasing the series resistance of the cell and reducing the effective absorption of light by the solar cell, thus limiting the increase in fill factor and short-circuit current, and reducing the conversion of the solar cell efficiency

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