Study of the Twelve Busbar Technology and the Stress-Induced Degradation within the Solar Modules

Abstract

To achieve cost reduction and efficiency increase of module products, the multi-busbar technology has recently been applied in photovoltaic crystalline silicon modules. Compared with the current five busbar modules, the multi-busbar modules use round ribbons to reduce the resistance loss and increase the secondary utilization of the light on the surface of the ribbon, thereby increasing the power output of modules. However, the use of multi-busbar technology requires redesign of the cell pattern, and thicker solder ribbons may probably lead to more degradation due to inner stress. This stress-induced degradation of the twelve busbar modules was investigated by thermal cycling test and electroluminescence test. The test results demonstrate that by increasing the thickness of EVA, the cracking of the cells caused by the stress during the thermal cycle can be effectively reduced. Our twelve busbar modules exhibited good reliability in the damp heat and UV sequence tests.

Study on the effect of finger fracture characteristics on the performance of crystalline silicon solar cell

“…8 For this reason, scientists and technicians have designed a variety of solar cells with different finger structures. 9,10 The application of the double screenprinting technique, 11,12 stencil printing technique, 13 parallel dispensing technique, 14,15 and knotless screens 16 not only reduces the amount of Ag paste required but also increases the solar cell robustness. In particular, research on knotless screen technology can effectively improve the printed finger geometry and reduce the consumption of silver paste.…”