Patent ID: 8502068

Claim:
A photo-active layer within a solar cell, the photo-active layer comprising: a tree-like nanostructure array, each said tree-like nanostructure comprises a trunk part and a branch part used as an electron acceptor, wherein said trunk part is used to provide a long straight transport pathway to transport electrons, a diameter of said trunk part is more than or equal to 30 nm and less than or equal to 10 nm, a length of said trunk part is larger than or equal to 50 nm, a diameter of said branch part is less than or equal to 10 nm, a length of said branch part is less than or equal to 40 nm; and a conjugate polymer filler, said conjugate polymer filler is as an electron donor, wherein the large contact area between said branch part of said tree-like nanostructure array and said conjugate polymer filler provides electron-hole separation.