Auxiliary gate electrode and solar cell

Abstract

The invention discloses an auxiliary gate electrode and a solar cell and belongs to the field of the solar cell. A plurality of auxiliary grids overlapped with a main grid of the solar cell are adopted, and the auxiliary grids in contact with the corresponding main grid are linearly / nonlinearly reduced continuously / sectionally in the direction far away from the main grids at the height vertical toa plane of the solar cell. Continuous linearity can be realized, e.g., a wedge-shaped structure, the structure can be continuous non-linear, for example, the structure descends in a cambered surface,a third structure can be a discontinuous multi-layer trapezoidal structure, an upper plane and a lower plane of the trapezoid can be arranged horizontally, can be arranged in an inclined plane manner, and can furhter form an inclined plane with an acute angle, as long as it can be guaranteed that the auxiliary grids are lowered, electrical characteristics of the auxiliary grids can be guaranteed,and the use amount of silver paste can be reduced.

Description

technical field [0001] The invention relates to the field of solar cells, and more specifically, to a sub-gate electrode and a solar cell. Background technique [0002] A solar cell is a semiconductor device that produces a photovoltaic effect (photovoltaic effect for short). The shape and basic structure of solar cells are as follows: figure 1 . The basic material is the substrate substrate, mostly P-type single / polycrystalline silicon wafers, with a thickness of about 0.15-0.2mm. The upper surface is an N+ type region, forming a PN+ junction. There are gate-shaped metal electrodes on the surface of the junction area, such as figure 2 , the thick and few vertically arranged grid-like electrodes are the main grid, the thin and dense horizontally arranged grid-like electrodes are the sub-grid, and the other side is the metal bottom electrode. The upper and lower electrodes respectively form ohmic contacts with the N+ region and the P region, and the entire upper surface...

AI Technical Summary

Problems solved by technology

[0009] Aiming at the problems existing in the prior art that the grid electrode requires large paste consumption, high cost, difficulty in connecting the main grid and the sub-grid, and affecting subsequent processes, the present invention provides a sub-gate electrode and a solar cell, which can realize Avoid shading loss, reduce conduction resistance, save single-chip consumption of sub-gate paste, reduce passivation film loss, and reduce subsequent production defect rate

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