| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a dye-sensitized solar cell in which visibility at night can be secured without depending on other means such as a luminous body, and to provide a road sign using it. <P>SOLUTION: By making light L1 incident on a transparent substrate 41 from the light incident side α, and by making the light transmitted through a light electrode layer 3 as light L2 retroreflected to the side of the light electrode layer 3 using a reflecting means 1 installed on a counter substrate 2, retroreflectivity is provided to the dye-sensitized solar cell 10, and the visibility at the night can be secured by reflecting the light irradiated from a headlight of a vehicle or the like even at the night without depending on the other means such as the luminous body. Moreover, power generation efficiency can be enhanced by the retroreflected light L2. <P>COPYRIGHT: (C)2008,JPO&INPIT |
