| 摘要 |
PROBLEM TO BE SOLVED: To improve photoelectric conversion efficiency under the light irradiation with the same intensity by mutually overlapping a plurality of photoelectric conversion units each constructed of a metal oxide semiconductor electrode, an electrolyte having an oxidation-reduction pair with a pigment absorbed on the electrode surface, and an opposing electrode. SOLUTION: Two cell structures are overlapped mutually with the upper and lower cells electrically connected to each other, and a single lamination cell using transparent conductive films 2a, 2c as electrodes for taking out a current is formed. A photoelectromotive force provided by this element structure is about the double of that of an existing one. The incident light is not absorbed by a sensitizing pigment 4a and the transmitted light is absorbed by a sensitizing pigment 4b in the lower part, so that generated current is increased. Particularly, if pigments with different absorption wavelength areas respectively are used, the light which cannot be absorbed by the sensitizing pigment 4a in the upper part can be absorbed by the sensitizing pigment 4b in the lower part, so that the incident light can be used effectively. |
