TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Method: The putting step comprises using an entry tray (132) to support the aluminum foil on the conveyer belt, where the solar cell is formed in the entry tray. The entry tray is coated with many graphite powders, and the first surface coated with the phosphorus layer mixed with the graphite powders is faced to the entry tray. The first thermal treatment comprises heating the aluminum foil and the phosphorus layer at 300 degrees C. The n-type AlP layer is formed by using the silicon as an n-dopant. In the method: a silicon material is heated to 1500 degrees C as the molten silicon material, where the molten silicon material is spray-coated on the second surface of the aluminum layer before entering the second thermal treatment, and the second thermal treatment comprises melting the remaining aluminum foil at 660 degrees C to merge into the silicon matrix as an additional p-dopant, and heating the spray-coated silicon material at 900 degrees C to anneal the p-type polysilicon layer; a material of the AlP layer comprises red phosphorus powders; after the step of transferring the solar cell from the annealing column into the second vertical stack further comprises attaching many digital electrodes to a exposed surface of the n-type AlP layer, and sealing the digital electrodes and the n-type AlP layer with a bonding glass; a material of the digital electrodes comprises nickel; and after the step of sealing the digital electrodes and the n-type AlP layer further comprises adding a reflective metal back layer to an exposed surface of the p-type polysilicon layer. The step of annealing the solar cell: is performed at 900-1000 degrees C. The digital electrodes are imprinted on a separable waxy surface, and formed by a conductive ink in an ink-jet printing material which is printed on the separable waxy surface. The solar cell is sealed in a stainless steel or an aluminum alloy well covered by a flat bonding glass. Preferred Components: The reflective metal back layer comprises an aluminum layer. EXAMPLE - No suitable example given.