Patent ID: 7365024

Claim:
The chemical solution coating method comprising: a first step of disposing a semiconductor substrate on a substrate supporting unit with a first face to be coated with a chemical solution facing upward; a second step of moving a chemical solution spraying member for spraying the chemical solution to an initial position which is positioned in the vicinity of the first face of the semiconductor substrate and where the chemical solution is to be applied; and a third step of moving the chemical solution spraying member from the initial position in accordance with a predetermined travel pattern and, simultaneously, spraying the chemical solution from the chemical solution spraying member toward the first face of the semiconductor substrate to complete said coating method while continuously spraying the chemical solution, wherein the chemical solution is a material for forming a diffusion preventing film, the semiconductor substrate is a substrate for a solar battery having a polygonal shape, the first face of the semiconductor substrate is not a light-reception face, the initial position of the chemical solution spraying member is in a region in the vicinity of the periphery of the first face of the semiconductor substrate, the travel pattern is a pattern of moving the chemical solution spraying member along the whole periphery of the semiconductor substrate the chemical solution spraying member has a spraying mechanism for outputting the housed chemical solution in an atomized state while sucking the chemical solution by negative pressure, and the third step includes a process of jetting a gas at a flow rate such that the sprayed chemical solution does not spread to a second face on the side opposite to the first face, from below toward the semiconductor substrate in a space between a wraparound spreading preventing plate, which is disposed below the position of the semiconductor substrate mounted on the substrate supporting unit so as to surround the substrate supporting part, and the substrate supporting unit.