| 摘要 |
[Problem] To significantly reduce the processing time of a step in which a coloring matter is adsorbed onto a porous semiconductor layer formed on the surface to be treated of a substrate. [Solution] A dye adsorption unit (20) includes a processing tank (30) of which the upper surface is opened, in order to perform a batch dye adsorption process for a predetermined number of substrates (G). The dye adsorption unit (20) further includes, as a moving system around the processing tank (30), a boat (32) capable of going in and out of the processing tank (30) from the upper opening, a boat transport unit (34) that serves for the boat (32) to go in and out of the processing tank (30), and a top cover (36) for detachably closing the upper opening. Further, the dye adsorption unit (20) includes a dye solution supply unit for supplying the dye solution into the processing tank (30), and a flow control unit for controlling the flow of the dye solution in the processing tank during the dye adsorption processing.
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