NOVELTY - Fabricating a solar cell (160) on a conveyer belt comprises: coating a first surface of an aluminum foil with a phosphorus layer mixed with many graphite powders; putting the aluminum foil with the phosphorus layer and the powders on the belt; performing a first thermal treatment to activate a portion of the aluminum foil and the phosphorus layer on the first surface; spray-coating a molten silicon material on a second surface of the remaining aluminum foil; performing a second thermal treatment to distribute the material; annealing the solar cell in hydrogen; and transferring the cell.    USE - The method is useful for fabricating a solar cell on a conveyer belt.    ADVANTAGE - The method: is continuous, and thus the solar cell is formed layer-by-layer in the entry tray; and applies the first and second thermal treatments rather than cutting, polishing and implanting dopant materials to form the semiconductor layers (n-type AlP layer and p-type polysilicon layer), and thus economical.    DETAILED DESCRIPTION - Fabricating a solar cell (160) on a conveyer belt comprises: coating a first surface of an aluminum foil with a phosphorus layer mixed with many graphite powders; putting the aluminum foil with the phosphorus layer and the powders on the belt; performing a first thermal treatment to activate a portion of the foil and the phosphorus layer on the first surface to form an aluminum phosphide (AlP) layer (140), where a portion of the foil is remained on the belt; spray-coating a molten silicon material on a second surface of the remaining aluminum foil, where the second surface is opposite to the first surface, a portion of the molten silicon material meets AlP to form an n-type AlP layer, and the molten silicon material comprises boron; performing a second thermal treatment to distribute the molten silicon material as a p-type polysilicon layer (152) on the n-type AlP layer, where the remaining aluminum foil is utilized as an additional p-dopant of a silicon matrix, and the boron is utilized as a p-dopant so that a solar cell including the p-type polysilicon layer and the n-type AlP layer is formed on the belt; annealing the solar cell in hydrogen by entering the solar cell into an annealing column (170) and ascending the solar cell in a first vertical stack in the annealing column; and transferring the solar cell from the annealing column into a second vertical stack to descend from top to bottom.    DESCRIPTION OF DRAWING(S) - The figure shows an illustrative view of fabricating the solar cell.    Entry trays (132)    Aluminum phosphide layer (140)    p-Type polysilicon layer (152)    Solar cell (160)    Annealing column (170)