Abstract: Some embodiments of the present disclosure provide an N-type TOPCon cell with double-sided aluminum paste electrodes, and a preparation method therefor. The front side of the cell is provided with a front-side silver main grid and a front-side aluminum fine grid, and the back side is provided with a back-side silver main grid and a back-side aluminum fine grid. The method for preparing the cell includes: texturing?B diffusion?BSG removal?alkali polishing?depositing a tunnel oxide layer and a polysilicon layer on a back side of a substrate by means of LPCVD?P diffusion on the back side?PSG removal?plating removal?deposition of an AlOx preparatory layer and a first SiNxHy preparatory layer on the front side?deposition of a second preparatory layer SiNxHy on the back side?UV laser ablation on the front side of the substrate and the back side of the substrate?screen printing.

Abstract: Some embodiments of the present invention relate to a technical field of N-type TOPCon solar cells, and disclosed a back-side metal electrode of an N-type TOPCon solar cell. The back-side metal electrode includes a substrate, a plurality of first silver fine grids disposed on a passivation film which is on a back side of the substrate, a plurality of second aluminum fine grids overlaid on the plurality of first silver fine grids, and a plurality of first silver main grids disposed perpendicular to the plurality of first silver fine grids. Each of the plurality of first silver main grids is a segmented structure. The back-side metal electrode further includes a plurality of second aluminum main grids, which are formed, in a printing manner, between any two adjacent grid segments of a plurality of grid segments and around each of the plurality of grid segments.

Abstract: Disclosed is a positive electrode of a crystalline silicon solar cell with a break-proof grid function, comprising a positive electrode busbar (1), a positive electrode grid (2), and a break-proof grid structure (3). The break-proof grid structure (3) and the positive electrode grid (2) are integrally printed and formed. The break-proof grid structure (3) is an octagon with a hollow-out groove (4) provided on its rear side. The break-proof grid structure (3) includes a rectangular grid segment (31) located in the middle, and two isosceles trapezoidal grid segments (32) that are located at both sides of the rectangular grid segment (31) and are provided symmetrically with the rectangular grid segment (31) as a center. The rectangular grid segment (31) spans the positive electrode busbar (1), and the left and right ends of the rectangular grid segment (31) extend out of the positive electrode busbar (1). The extended grid segment is a rectangular extensional break-proof grid segment (311).

Abstract: Disclosed is a positive electrode of a crystalline silicon solar cell with a break-proof grid function, comprising a positive electrode busbar (1), a positive electrode grid (2), and a break-proof grid structure (3). The break-proof grid structure (3) and the positive electrode grid (2) are integrally printed and formed. The break-proof grid structure (3) is an octagon with a hollow-out groove (4) provided on its rear side. The break-proof grid structure (3) includes a rectangular grid segment (31) located in the middle, and two isosceles trapezoidal grid segments (32) that are located at both sides of the rectangular grid segment (31) and are provided symmetrically with the rectangular grid segment (31) as a center. The rectangular grid segment (31) spans the positive electrode busbar (1), and the left and right ends of the rectangular grid segment (31) extend out of the positive electrode busbar (1). The extended grid segment is a rectangular extensional break-proof grid segment (311).

Abstract: Disclosed is a screen printing plate (5) for manufacturing a crystalline silicon solar cell, a positive electrode of the crystalline silicon solar cell comprising a positive electrode busbar (1), a positive electrode grid (2) and a break-proof grid structure (3), wherein the screen printing plate (5) is used at least for integrally printing and forming the positive electrode grid (2) and the break-proof grid structure (3). The screen printing plate (5) is provided with a blocking portion for blocking the passage of a paste, the blocking portion is a photosensitive emulsion (6) or a non-photosensitive emulsion, and the blocking portion corresponds to the break-proof grid structure (3) of the positive electrode and is used for forming a hollow-out groove (4) in the break-proof grid structure (3) when the positive electrode is printed.