Solar cell substrate, manufacturing method of solar cell and crucible used for same

Abstract

The invention relates to a method used for preparing a silicon substrate with a majority of crystal orientation being (100) and a crucible with multiple pockets at the bottom of with the crucible. A silicon seed crystals with (100) crystal orientation is placed in each pocket of the crucible, a silicon material is filled in the crucible for casting, the crucible is placed in a casting unit, and the pockets are positioned below a heating and fusion zone; and heating and melting begin from the top of the crucible. Once the silicon material is melted to the bottom, the silicon fluid flows in the pockets and contacts with the child crystal; and then, the crucible is slowly lowered, a lower molten part begins to solidify and grows along the (100) direction of the seed crystals.

Description

technical field [0001] The present invention relates to methods of manufacturing low-cost base materials for devices, such as solar photovoltaic cells, LEDs, etc., and more particularly, the present invention relates to methods of manufacturing low-cost silicon wafers. Background technique [0002] According to the current process, there are three main stages in the production of polysilicon-based solar cells. First, large quantities of silicon wafers are produced as substrates, typically millions of wafers per month for a 25 MW capacity factory. Second, these wafers are processed into solar cells by forming p-n junctions and metal printing. Third, these silicon chips are then "packaged" into a module for installation into the user's device. [0003] Silicon materials for solar cells are manufactured by thermally decomposing harmful gases containing Si-H-CL, such as dichlorosilane and trichlorosilane, to produce ultra-high-purity polysilicon, generally known as Nine nines...

AI Technical Summary

Problems solved by technology

Specifically, it is difficult to match the appropriate etchant to etch all the crystal lattice directions on the surface of the silicon wafer into an ideal texture

Images