It is an object of the present invention to provide a dye-sensitized solar cell, etc. The volatilizer for phytoncide air includes: a reservoir having a charging space which is filled with a Hinoki cypress diluted essential oil; slope plates disposed in the charging space of the reservoir; an air inlet and an air outlet respectively formed at an upper portion of the reservoir; and an exchange sensor disposed at a lower portion of the reservoir and connected with a warning light. A sub-assembly is adapted to cooperate with and fit into the hollow base. The signal source is used to both modulate the pilot tone and control the digital filter for recovering the pilot tone.