Solar cell and method of manufacturing the same

Abstract

The present disclosure relates to a solar cell and a preparation method thereof, the solar cell comprising a silicon substrate, a passivation layer and a grid electrode provided on the silicon substrate, the grid electrode comprising a main grid line and a sub grid line, the sub grid line penetrating through the passivation layer and forming an ohmic contact with the silicon substrate, the sub grid line being a silver grid line, and silver-silicon alloy being distributed in a region of the silver grid line close to the silicon substrate. The solar cell provided by the present disclosure has the silver-silicon alloy distributed in the region of the sub grid line close to the silicon substrate, which is dense and stable. First, a continuous and dense conductive channel is formed between the sub grid line and the silicon substrate, thereby forming a good ohmic contact between the sub grid line and the silicon substrate. Second, the interface defects between the sub grid line and the silicon substrate are reduced. Third, the silver-silicon alloy is formed in situ between the sub grid line and the silicon substrate, thereby improving the bonding force between the grid electrode and the silicon substrate, and thus improving the reliability and service life of the solar cell.

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