Chinese language researchers have developed a brand new passivation method for shingled photo voltaic panels primarily based on tunnel oxide passivated contacts (TOPCon) or heterojunction (HJT) tech. This reduces recombination loss within the cell-to-module course of and reportedly will increase open-circuit voltage, fill issue, and effectivity.
Researchers led by Hebei College in China have developed a low-temperature, non-vacuum, large-area spray passivation method to compensate for the lack of effectivity attributable to the slicing and separation course of within the manufacturing of shingled photo voltaic panels. panel primarily based on TOPCon and HJT know-how.
The teachers defined that the losses are attributable to combining the strips of the shingled panels within the cell-to-module (CTM) course of, for the reason that photo voltaic cells have to be minimize into a number of subcells by a single course of. in laser writing that leaves unmodified interior edges, which in flip leads to diminished effectivity because of recombination.
“To compensate for this recombination loss through the CTM course of, we used an natural polymer ink combined with ethanol, water and Nafion to kind the passivation layer,” mentioned the scientists. “We present that the natural passivation coating can cut back the newly shaped loss edge from laser writing.”
Mentioned technique of spraying can produce a uniform movie on the passive aspect in comparison with the one with out.
“Photo voltaic cells with a passivation layer are brighter than these with out. This reveals that the natural passivation layer has a wonderful edge passivation impact for TOPCon and SHJ photo voltaic cells and the sting recombination losses are largely diminished, “they mentioned, including that the passivation layer considerably will increase the open-circuit voltage and fill issue of the cells. .
They discovered that the method can enhance the fill issue of a 24.4%-efficient HJT gadget from 77.9% to 82.5%, with the effectivity itself rising by 1% to 2%.
“The gadget can obtain long-term stability by cautious humidity management and easy packaging know-how,” additionally they mentioned.
The scientists launched a brand new method in “Compensating Chopping Losses by Passivation Answer for Business Upgradation of TOPCon and SHJ Photo voltaic Cells,” which was lately revealed in Superior Power & Sustainability Analysis. The analysis workforce additionally contains scientists from the Chinese language module maker Yingli Inexperienced Power Holding Co., Ltd. and the Quzhou Inexperienced Business Clustering Zone.
“This easy and non-vacuum technique is suitable with present manufacturing strains and could be straight utilized to industrial silicon photo voltaic cells sooner or later,” they concluded.
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