Method for fabricating solar cell

A method of fabricating a solar cell on a conveyer belt, comprising:

• coating a first surface of an aluminum foil with a phosphorous (P) layer mixed with a plurality of graphite powders;
• putting the aluminum foil with the phosphorous layer and graphite powders on the conveyer belt;
• performing a first thermal treatment to activate a portion of the aluminum foil and the P layer on the first surface to form an aluminum phosphide (AlP) layer, wherein a portion of the aluminum foil is remained on the conveyer belt;
• spray-coating a molten silicon material on a second surface of the remaining aluminum foil, wherein the second surface is opposite to the first surface, and a portion of the molten silicon material meeting AlP to form an n-type AlP layer, wherein the molten silicon material comprises boron (B);
• performing a second thermal treatment to distribute the molten silicon material as a p-type polySi layer on the n-type AlP layer, wherein the remaining aluminum foil is utilized as an additional p-dopant of a silicon matrix, and the boron is utilized as a p-dopant such that a solar cell including the p-type polySi layer and the n-type AlP layer is formed on the conveyer belt;
• annealing the solar cell in hydrogen by entering the solar cell into an annealing column 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.