Solar cell using carbon nanotubes and process for producing the same

A method for producing a solar cell, the method comprising:

• feeding a solution including a plurality of carbon nanotubes each having a functional group bonded thereto, to a surface of a layer including an n-type semiconductor substance;
• and
• crosslinking the carbon nanotubes to each other through chemical bonds with the plurality of functional groups to form a carbon nanotube structure having a network structure including the plurality of carbon nanotubes crosslinked to each other.

A method for producing a solar cell, the method comprising:

• dropping a mixed liquid including carbon nanotubes onto a liquid surface of a film forming liquid to spread the carbon nanotubes on the liquid surface of the film forming liquid, so as to form a carbon nanotube thin film, and
• drawing up a layer including a p-type semiconductor substance, a part or whole of which has been immersed in advance in the film forming liquid, from the liquid surface of the film forming liquid to make a surface of the layer including the p-type semiconductor substance in contact with the carbon nanotube thin film spread on the liquid surface of the film forming liquid, so as to form the carbon nanotube thin film on the surface of the layer including the p-type semiconductor substrate.