Patent ID: 7928318

Claim:
A method for producing a solar cell, the method comprising: forming a first electrode on an end portion of a surface of a layer containing an n-type semiconductor substance; forming a carbon nanotube structure film, which does not contact the first electrode, on or above the surface of the layer containing the n-type semiconductor substance on which the first electrode was formed, but other than the end portion, the carbon nonotube structure film having a network structure of carbon nanotubes and p-type semiconductor characteristics attributed to the network structure of carbon nanotubes that forms a pn junction or a pin junction between the n-type semiconductor substance and the carbon nanotube structure film; and forming a second electrode on the carbon nanotube structure film, wherein the forming of the carbon nanotube structure film comprises: feeding a solution including a plurality of carbon nanotubes, each having a functional group bonded thereto, and crosslinking the carbon nanotubes to each other through chemical bonds with the plurality of functional groups to form the network structure, after feeding the solution.