Patent ID: 8466004

Claim:
An organic photosensitive optoelectronic device comprising: an anode; a cathode; and a first organic layer and a second organic layer disposed between the anode and the cathode, wherein a bulk heterojunction with an interpenetrating donor-acceptor network is formed between the first and second organic layers, said device prepared by the steps of: (a) depositing a first organic layer over the anode; (b) depositing a second organic layer over the first organic layer; (c) depositing a confining layer over the second organic layer to form a stack; (d) annealing the stack; and (e) depositing a cathode over the second organic layer, wherein the device is capable of generating a voltage when exposed to light, wherein said confining layer prevents the formation of a rough surface morphology while allowing formation of said bulk heterojunction between the first and second organic layers during said annealing step.