Method for making polymer solar cell

A method for making a polymer solar cell, comprising:

• placing a carbon nanotube array into a polymer solution, wherein the carbon nanotube array comprises a plurality of carbon nanotubes, each of the plurality of carbon nanotubes has a first end and a second end opposite to the first end, the first end of each of the plurality of carbon nanotubes is exposed from the polymer solution, and the second end of each of the plurality of carbon nanotubes is immersed in the polymer solution;
• curing the polymer solution to form a polymer layer, so that a photoactive layer consisting of the polymer layer and the plurality of carbon nanotubes is formed, wherein a material of the polymer layer is polymer, the polymer layer comprises a first polymer surface and a second polymer surface opposite to the first polymer surface, the first end of each of the plurality of carbon nanotubes is exposed from the polymer layer, and the second end of each of the plurality of carbon nanotubes is embedded in the polymer layer;
• forming an insulating layer on the first polymer surface, wherein the first end of each of the plurality of carbon nanotubes passes through the insulating layer and exposed from the insulating layer;
• forming a cathode electrode on a surface of the insulating layer away from the polymer layer, wherein the first end of each of the carbon nanotubes is in direct contact with the cathode electrode, the plurality of carbon nanotubes are electron acceptors, electrons are generated at a contact surface of the polymer layer and the plurality of carbon nanotubes, and an electrical path is defined from the plurality of carbon nanotubes to the cathode electrode;
• and
• forming an anode electrode on the second polymer surface.