Patent ID: 8344244

Claim:
A solar cell comprising: a layer containing an n-type semiconductor substance; a first electrode provided on an end portion of a surface of the layer containing the n-type semiconductor substance; a carbon nanotube structure film provided on the layer containing the n-type semiconductor substance without being in contact with the first electrode and having plural carbon nanotubes; and a second electrode provided on the carbon nanotube structure film, wherein the plural carbon nanotubes each have a functional group bonded thereto, the carbon nanotube structure film has a network structure formed by crosslinking between the plural carbon nanotubes through chemical bond with functional groups had by the plural carbon nanotubes, respectively, and p-type semiconductor characteristics attributed to the network structure of the plural carbon nanotubes, and a pn junction or a pin junction between the n-type semiconductor substance of the layer containing the n-type semiconductor substance and the carbon nanotube structure film is formed.