Solar cell and its preparation method, photovoltaic module

Abstract

The present application provides a solar cell, a method for preparing the same, and a photovoltaic module. The solar cell includes: a passivation-treated semiconductor substrate, at least one surface of the passivation-treated semiconductor substrate is provided with a grid line electrode; At least one layer of electrode film on the non-connected area, the non-connected area is the area that does not overlap with the area where the gate line electrode is used to connect the conductive strip; the electrode film includes an amorphous silicon thin film layer, a zirconia thin film layer or a titanium oxide thin film layer At least one of; when the electrode film is an amorphous silicon thin film layer, the refractive index of the electrode film is greater than or equal to 4, and when the electrode film is a zirconia thin film layer or a titanium oxide thin film layer, the refractive index of the electrode film is greater than or equal to 2. The solar cell and the preparation method thereof provided by the present application can restrain the grid line electrode of the solar cell from being corroded by alkali metal ions, prevent the potential decay of the cell, and improve the photoelectric conversion efficiency.

Description

technical field [0001] The present application relates to the technical field of photovoltaic cells, in particular, to solar cells, their preparation methods, and photovoltaic components. Background technique [0002] The schematic diagram of the structure of the existing solar cell is as follows: figure 1 As shown, the surface is coated with a layer of silicon nitride, which can reduce reflection and passivation; then screen-print silver paste on the silicon nitride layer to prepare silver grid lines; through sintering, the silver paste ablates the silicon nitride layer and the silicon nitride layer. The semiconductor substrate forms an ohmic contact and becomes the electrode output carrier of the solar cell. [0003] However, after the solar cell is made into a solar cell, water vapor is likely to enter the edge part, and the solar cell packaging film is prone to hydrolysis to generate acetic acid, which will react with the alkali metal in the glass cover to generate a la...

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Problems solved by technology

[0003] However, after the solar cell is made into a solar cell, water vapor is likely to enter the edge part, and the solar cell packaging film is prone to hydrolysis to generate acetic acid, which will react with the alkali metal in the glass cover to generate a large amount of free-moving alkali metal Ions (Na + ), will react with the silver grid lines on the surface of the cell, thereby corroding the battery grid lines, resulting in an increase in series resistance, resulting in attenuation of solar cell performance, and the potential attenuation cannot be recovered

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