Sintering method for improving rear-passivated solar cell filling performance
A technology of filling performance and sintering method, which is applied in the direction of circuits, electrical components, climate sustainability, etc., can solve the problems of filling performance and battery efficiency reduction, increasing battery series resistance Rs, poor passivation performance, etc., to achieve filling Effects of factor increase, void reduction, and efficiency improvement
Active Publication Date: 2014-11-12
TRINA SOLAR CO LTD
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Problems solved by technology
The cavity not only has narrow BSF and poor passivation performance, but also increases the series resistance Rs of the battery, resulting in a decrease in filling performance and battery efficiency
Method used
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[0014] The present invention will be further described now in conjunction with accompanying drawing. These drawings are simplified schematic diagrams only to illustrate the basic structure of the present invention in a schematic way, so they only show the components relevant to the present invention.
[0015] Such as figure 2 As shown, a sintering method for improving the filling performance of back passivated solar cells, the specific sintering steps are as follows:
[0016] (1) Slurry drying: The solar cells printed with Al paste and Ag paste are placed into the sintering furnace with the Ag paste on the front facing up, and the paste is dried in the first temperature zone. The drying temperature is 200-400°C , the time is 30-50s;
[0017] (2) Turning over and Al sintering: The solar cell passes through the heating zone, and the heating time is 15-25s. When the temperature rises to 500-550°C, the solar cell is turned over, so that the Al paste on the back of the solar cel...
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The invention relates to a sintering method for improving rear-passivated solar cell filling performance. The sintering method specifically includes the steps of (1), slurry drying by means of placing a solar cell with front Ag slurry upward into a sintering furnace for slurry drying; (2), overturning and Al sintering by means of overturning the solar cell when the temperature rises to 500-550 DEG C to enable rear Al slurry of the solar cell to be placed upward so as to enter the sintering furnace for Al sintering; (3), secondary overturning and Ag sintering by means of overturning the solar cell again when the temperature of the sintering furnace rises to 750-780 DEG C to enable the front Ag slurry to be placed upward for Ag sintering; and (4), rapid cooling by means of cooling within the time of 0.5-1 minute. By the sintering method for improving the rear-passivated solar cell filling performance, the filling performance of the rear Al slurry can be improved while front emitters are guaranteed to be unpolluted, cavities are reduced, filling factors of the solar cell can be increased by 0.5%-1%, and efficiency is improved by 0.1-0.3%.
Description
technical field [0001] The invention relates to a sintering method for improving the filling performance of a back passivated solar cell. Background technique [0002] The metallization process of crystalline silicon solar cells includes printing Al (aluminum) paste and Ag (silver) paste on the back and front of the cell, and then undergoing low-temperature drying and high-temperature sintering in a rapid sintering furnace to form a good metal-semiconductor contact. [0003] At present, the sintering of solar cells generally adopts chain-type sintering furnaces. After the printing is completed, the Ag paste of the front electrode of the battery is placed upwards and enters the sintering furnace. At a certain belt speed, the battery is sequentially dried, heated and sintered, and cooled. During the whole sintering process, the battery is always placed with the Ag paste on the front electrode facing up and the Al paste on the back facing down, such as figure 1 shown. In thi...
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IPC IPC(8): H01L31/18
CPCY02P70/50
Inventor 李中兰许庭静
Owner TRINA SOLAR CO LTD