To prevent a photoelectric conversion element from being deteriorated due to water.
An absorbent 302 is provided between a photoelectric conversion element 301 and an external container 303, and a sensor 304 is provided in a part of the absorbent 302. A sensor 305 is provided on an outer side face of the external container 303. A shutter 306 is provided on a side face of the external container 303. The dryer is configured so that airtightness within the external container 303 is kept while the shutter 306 is closed. On the other hand outer, air comes into the external container 303 when the shutter 306 is opened. When difference of humidity between the sensor 304 and the sensor 305 exceeds a prescribed threshold, the shutter 306 is opened to introduce the outer air so that the absorbent 302 is reproduced. This invention is applicable to a dye-sensitized photoelectric conversion element.
FUKUSHIMA KAZUAKI
TAKAGI HIROTAKA
Takashi Nishikawa