Method for producing back contact cell, cell string and cell assembly

Abstract

The invention is suitable for the technical field of solar cells, and provides a method for manufacturing a back contact cell, a cell string and a cell assembly, metal film layers directly welded with a welding piece are prepared on a first doping layer and a second doping layer, and a main grid does not need to be arranged for convergence, so that the cost is reduced, and the production efficiency is improved. And a metalized fine grid and an electroplating process do not need to be arranged on the doping layer, so that the cost is reduced. Meanwhile, the barrier layer is arranged below the metal thin film layer, so that metal atoms can be blocked when the metal thin film layer is deposited under the condition of realizing electric conduction, the probability that the metal atoms diffuse into a doping layer and a silicon wafer below is reduced, and the electrical performance of the back contact battery is ensured.

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