Solar cell and solar cell module

Abstract

A solar cell includes a semiconductor substrate, a back electrode layer and a front electrode layer including a first bus bar, a second bus bar, first finger bar units, second finger bar units, first interconnecting bars, and second interconnecting bars. The first finger bar units are spaced apart from the second finger bar units. Each of the first finger bar units has first finger bars and a first auxiliary bar connected to the first finger bars. Each of the second finger bar units has second finger bars and a second auxiliary bar connected to the second finger bars. Each first interconnecting bar interconnects two adjacent first finger bar units. Each second interconnecting bar interconnects two adjacent second finger bar units.

Description

technical field [0001] The invention relates to a solar cell and its module, in particular to a silicon crystal solar cell and its module. Background technique [0002] refer to figure 1 , the known silicon solar cell mainly includes: a photoelectric conversion substrate 91 for converting light energy into electrical energy, and a front electrode 92 and a back electrode (not shown) for conducting current. The front electrode 92 includes a plurality of bus bar electrodes 921 and a plurality of elongated finger bar electrodes 922 transversely connected to the bus electrodes 921 . In the manufacture of the front electrode 92 , the conductive paste can be coated by screen printing, and the conductive paste is solidified and formed through a sintering process, thereby forming the bus electrode 921 and the plurality of finger electrodes 922 . [0003] It is generally desired that the printed finger electrodes 922 have a higher aspect ratio (Aspect Ratio) to reduce the area of ​​...

AI Technical Summary

Problems solved by technology

However, due to the long extension length of known finger electrodes 922, it is difficult to print thin and long finger electrodes 922, and disconnection may occur from time to time during the printing process. Once the finger electrodes 922 Disconnection will affect the current collection effect, and it will also cause poor appearance of the battery. When performing electrical measurement of electroluminescence (EL), it will be observed that the brightness of the battery is uneven at the disconnection.

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