Efficient solar cell and processing technology thereof

Abstract

The invention discloses an efficient solar cell and a processing technology thereof. The solar battery piece is a polycrystalline N-type battery piece, a silicon oxide layer is arranged on the back face of the polycrystalline N-type battery piece, a polycrystalline silicon layer is arranged on the silicon oxide layer, an aluminum oxide layer is arranged on the front face of the polycrystalline N-type battery piece, and a silicon nitride layer is arranged on the aluminum oxide layer. According to the invention, the light attenuation is reduced through the polycrystalline N-type battery piece, and the silicon oxide layer in the back passivation structure enables electrons to tunnel into the polycrystalline silicon layer and simultaneously blocks minority carrier hole recombination, so that high open-circuit voltage and a fill factor are obtained, and short-circuit current is improved; and the aluminum oxide layer in the front passivation structure has good field passivation capability, the battery piece has higher short-circuit current, silicon nitride antireflection does not hinder carrier transmission but hinders minority carriers from reaching an interface, surface recombination is reduced, open-circuit voltage is improved, the conversion efficiency of the battery piece is improved, and the solar cell is suitable for wide popularization and application.

Description

technical field [0001] The invention relates to the technical field of solar energy, in particular to a high-efficiency solar cell and its processing technology. Background technique [0002] With the rapid growth of global energy demand, solar cells will develop in the direction of higher efficiency and lower cost. Crystalline silicon high-efficiency solar cells are the focus and focus of research and development of new solar cells in the world. The existing cells are introduced on the back The aluminum oxide / silicon nitride dielectric layer is passivated, and local metal contacts are used to effectively reduce the electronic recombination on the back surface and improve the conversion efficiency of the battery. However, the contact range of the battery on the back is limited to the opening area, and the high recombination rate at the opening remains. However, the TOPCon battery has good passivation properties of doped polysilicon layer and a back metal full contact structu...

AI Technical Summary

Problems solved by technology

[0002] With the rapid growth of global energy demand, solar cells will develop in the direction of higher efficiency and lower cost. Crystalline silicon high-efficiency solar cells are the focus and focus of research and development of new solar cells in the world. The existing cells are introduced on the back The aluminum oxide / silicon nitride dielectric layer is passivated, and local metal contacts are used to effectively reduce the electronic recombination on the back surface and improve the conversion efficiency of the battery. However, the contact range of the battery on the back is limited to the opening area, and the high recombination rate at the opening remains. However, the TOPCon battery has good passivation properties of doped polysilicon layer and full contact structure of metal on the back, and there is still room for improvement in its conversion efficiency.