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Introduction to TOPCon Solar Cells

Release date:2021-04-15 Source:Raytech Pageviews:-

Compared with P-type crystalline silicon cells, N-type crystalline silicon cells have higher life, no LID, good low-light effect, and small temperature coefficient, which is the best option of silicon solar cell towards the highest efficiency of the theory.

TOPCon is a tunnel oxide passivated contact solar cell technology based on the principle of selective carriers, whose structure is N-type silicon substrate cells, prepares an ultra-thin layer of silicon oxide on the back of the cells, and then deposits a thin layer of doped silicon, which together form a passivation contact structure, effectively reduces surface composite and metal contact compounding, and provides more space for N-PERT battery conversion efficiency.

The concept of TOPCon cells was developed in 2013 by the Fraunhofer-ISE Institute for Solar Systems in Germany. TOPCon front and conventional N-type solar cells or N-PERT solar cells are not essentially different, the battery core technology is the back passivation contact, the back of the silicon wafer by a layer of ultra-thin silicon oxide (1 to 2nm) and a layer of phosphorus-doped microcrystalline amorphous mixed Si film. Passivation is activated by the annealing process, in which the Si film becomes crystalline and changes from a microcrystalline amorphous mixing phase to polycrystalline. The current N-type pre-passivation contact solar cell world record (25.8%) is maintained by the Fraunhofer-ISE Institute.

Ningbo Raytech New Energy Materials Co., Ltd. will continue to make contributions to carbon emission reductions across the world. Raytech specializes in “PV Modules Manufacturing and System Integration” and “Smart Panel Materials Manufacturing”. The company has independent product R&D teams, national key laboratory and 1.2GW full-automatic manufacturing line. Raytech Double-glass modules come with 12-year product warranty and 30-year performance warranty (2 years and 5 years longer than industry's standard product / performance warranty respectively).

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