Solar cell Al grid line structure and preparation method thereof
A solar cell and grid line technology, applied in circuits, electrical components, photovoltaic power generation, etc., can solve the problems of reducing the light-receiving area of the battery, large contact metal composite, and high resistivity
Inactive Publication Date: 2019-07-23
SPIC XIAN SOLAR POWER CO LTD +3
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Problems solved by technology
[0005] The problem with the above structure is that the conductivity of the Al grid line is much worse than that of the silver paste. In order to reduce the resistance of the auxiliary grid line, the width of the Al grid line is wider. The wide Al grid line located on the light-receiving surface of the solar cell will reduce the light-receiving area of the battery.
[0006] In addition, in the area of the silver paste welding point, due to the large contact metal complex and high resistivity formed by the silver paste and the P-type semiconductor, the existence of this area will reduce the photoelectric conversion efficiency of the battery.
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[0035] Such as figure 1 As shown, the solar cell Al grid line structure of the present invention includes a sub-grid line, and the sub-grid line includes a contact hole formed on the passivation layer / anti-reflection layer 102 of the P-type doped region 101 of the solar cell, Print non-burn-through aluminum paste on the contact hole as the sub-grid bottom layer 103 and the aluminum paste completely covers the contact hole below, and overprint a layer of linear silver paste on the sub-grid bottom layer 103 as the sub-grid top layer 104 ; The auxiliary gate line is connected to the main gate line 105 .
[0036] In this embodiment, the silicon substrate 100 can be either N-type or P-type; the P-type doped region 101 is located on the front side of the battery or on the backside of the battery, and the P-type doped region 101 completely or partially covers the silicon wafer substrate 100. On the surface, the P-type doped region 101 can be P-type doped crystalline silicon, P-type ...
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Abstract
The invention aims to disclose a solar cell Al grid line structure and a preparation method thereof; compared with the prior art, the auxiliary grid line of a P-type doped area adopts a laminated auxiliary grid line with aluminum paste on the bottom layer and with silver paste on the top layer to replace a silver paste or silver aluminum paste auxiliary grid line, so that the contact resistance and the contact combination of a gold half-ohmic contact area are obviously reduced, and the battery efficiency is improved; meanwhile, the cost consumption of the auxiliary grid line paste silver pasteor silver aluminum paste is reduced, and the battery cost is lowered; and the problem that the electric conductivity is low and the light shielding surface is large due to the fact that the single-layer Al is used as an auxiliary grid line is solved, the problem that the contact metal recombination of a silver paste welding point area is large and the resistivity is high due to the fact that thealuminum paste is used as the main grid line is solved, and the purpose of the invention is achieved.
Description
technical field [0001] The invention relates to a grid line structure and a preparation method thereof, in particular to an Al grid line structure of a solar cell and a preparation method thereof. Background technique [0002] Photovoltaic power generation is one of the main ways to use solar energy at present. Because of its cleanness, safety, convenience, and high efficiency, solar photovoltaic power generation has become an emerging industry that is generally concerned and focused on development by countries all over the world. Therefore, in-depth research and utilization of solar energy resources is of great significance to alleviate the resource crisis and improve the ecological environment. [0003] The P-type doped region of solar cells usually uses silver paste or silver-aluminum paste as the sub-grid metal electrode to complete the collection of photo-generated current from the cell substrate, and the sub-grid electrode is connected to the main grid line formed by t...
Claims
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Login to View More IPC IPC(8): H01L31/0224
CPCH01L31/022425Y02E10/50
Inventor 屈小勇吴翔高嘉庆
Owner SPIC XIAN SOLAR POWER CO LTD