Front grid line passivation contact-based PERC solar cell and preparation method thereof

Abstract

The invention belongs to the technical field of crystalline silicon solar cells, and relates to a front grid line passivation contact-basedPERC solar cell and a preparation method thereof. The solar cell comprises a P type monocrystalline silicon substrate; a back aluminum oxide passivation layer and a back silicon nitride passivation layer are sequentially arranged on the back surface of the P type monocrystalline silicon substrate from inside to outside. A front silicon oxide passivation layer and a front silicon nitride passivation layer are sequentially arranged on the front face of the Ptype monocrystalline silicon substrate from inside to outside; a front metal silver grid line penetrating through the front silicon oxide passivation layer and the front silicon nitride passivation layer is arranged on the front face of the P type monocrystalline silicon substrate. An ultrathin tunneling silicon oxide layer and a phosphorus-doped polycrystalline silicon layer are sequentially arranged on the front face of the P type monocrystalline silicon substrate and located below the front face metal silver grid line from inside to outside. According to the solar cell and preparation method thereof of the invention, the open-circuit voltage of the cell can be improved, the carrier recombination of a metal contact region can be reduced, the parasitic absorption of the doped polycrystalline silicon layer to light can be reduced, the current loss can be reduced, and the efficiency of the PERC cell can be improved.

Description

technical field [0001] The invention belongs to the technical field of crystalline silicon solar cells, and relates to a PERC solar cell and a preparation method thereof. Background technique [0002] In crystalline silicon solar cells, surface passivation is an important factor restricting efficiency. PERC (Passivated Emitter and Rear Cell), that is, passivated emitter and rear cell technology, was first proposed by Australian scientist Martin Green in 1983, and has now become a new generation of conventional technology for solar cells. PERC technology adds a fully covered passivation layer on the back of the cell to reduce back surface recombination and improve conversion efficiency, and then opens the passivation layer in the contact area through laser grooving to achieve metal contact. [0003] The advantages of PERC technology are also reflected in the fact that it can be superimposed with technologies such as multi-busbar, selective emitter and passivation contact to ...

AI Technical Summary

Problems solved by technology

However, due to the serious parasitic absorption of light by polysilicon, it will cause the short-circuit current loss of the battery.

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