Patent ID: 8647895

Claim:
A process of manufacturing a crystalline silicon solar cell, comprising at least the following steps: Step 1: taking a crystalline silicon wafer, in which a wet-chemical process is used to remove any mechanical damages on a surface of the crystalline silicon wafer, and then the wafer is subject to clean; Step 2: forming a rough surface on the surface of the crystalline silicon wafer by using a plasma device; Step 3: coating an Al 2 O 3 film on a non-rough surface of the crystalline silicon wafer, and then placing the wafer into a high-temperature phosphorus diffusion furnace for phosphorus diffusion; Step 4: forming a single-sided n diffusion layer on the rough surface of the crystalline silicon wafer by using the phosphorus diffusion process; and forming a phosphosilicate glass (PSG) film on a top surface of the single-sided n diffusion layer; Step 5: coating an anti-reflection layer SiNx film directly on a top surface of the PSG film; Step 6: coating an Al metallic film as a back ohmic electrode on one side of the Al 2 O 3 film; Step 7: irradiating a laser beam directly onto the anti-reflection layer SiNx film and the PSG film for the melting and removal of a local area, diffusing phosphorus atoms of the PSG film into the n diffusion layer to form a local area of n+—Si layer, and then directly irradiating the Al 2 O 3 film and the Al metallic film with a laser beam for local area melting and removal so that an Al—Si back ohmic contact electrode is formed between the Al metallic film and the crystalline silicon wafer; Step 8: forming a Ni film on the molten and removed area of the antireflection layer SiNx film and the PSG film by light-induced plating, and then electroplating a front ohmic contact electrode of copper material on the Ni film to form a solar cell component; and Step 9: form spacers, as peripheral electrical isolation, on the anti-reflection layer SiNx film, the PSG film, the n diffusion layer and the crystalline silicon wafer of the solar cell component by irradiating the laser beam.