Crystalline silicon solar cell positive electrode preparation device

Abstract

The invention discloses a crystalline silicon solar cell positive electrode preparation device, comprising a positive electrode screen printing plate and a printing head with air holes. The positive electrode screen printing plate comprises a screen printing plate basic body formed by a silk screen, and a latex film layer adhered to the basic body. The latex film layer is provided with positive electrode patterns. The positive electrode patterns are formed by M positive electrode main grids and N positive electrode secondary grids. The width of the positive electrode main grid is larger than the width of the positive electrode secondary grid. The latex film layer on the opening of the positive electrode secondary grid is provided with raised convex ribs. When the printing head prints, the air holes of the printing head release airflow, assisting silver paste output by the printing head to smoothly pass through the screen printing plate basic body and enter the positive electrode main grids and positive electrode secondary grids. Compared with the prior art, the device does not increase light shading area of the electrodes while improving conductivity of the electrodes, so as to improve photoelectric conversion efficiency of a cell, and the device is advantaged by effectively reducing broken lines of the positive electrode main grids and the positive electrode secondary grids.

Description

technical field [0001] The invention relates to the technical field of solar cells, in particular to a positive electrode preparation device for crystalline silicon solar cells. Background technique [0002] A solar cell is a device that effectively absorbs solar radiation energy and converts light energy into electrical energy by using the photovoltaic effect. When sunlight shines on a semiconductor P-N junction (P-N Junction), a new hole-electron pair (V-E pair) is formed. ), under the action of the P-N junction electric field, holes flow from the N region to the P region, electrons flow from the P region to the N region, and a current is formed after the circuit is turned on. [0003] The manufacturing process of crystalline silicon solar cells has 6 processes, namely texturing, diffusion, dephosphorous silicon glass and back junction, coating, screen printing, and sintering. Among them, screen printing is used to manufacture solar cell electrodes, which is divided into ...

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Problems solved by technology

The number of main grids is less than the number of auxiliary grids, and the width of the main grid is much larger than that of the auxiliary grids, but the height of the auxiliary grids is low. When the silver paste forms positive electrode auxiliary grid lines in the auxiliary grids, there are positive electrode auxiliary grid lines The disadvantages of small aspect ratio and low photoelectric conversion efficiency of the battery, the method of screen printing will easily cause the problem of disconnection of the main grid line of the positive electrode and the sub-grid line of the positive electrode

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