Patent ID: 7955889

Claim:
A method of fabricating an optoelectronic device, comprising: providing a first electrode disposed on a substrate, an exposed surface of the first electrode having a root mean square roughness of at least 30 nm and a height variation of at least 200 nm, the first electrode being transparent; depositing a conformal layer of a first organic semiconductor material onto said first electrode, the first organic semiconductor material being a small molecule material; depositing nanometer scale protrusions of the first organic semiconductor material directly onto said conformal layer; depositing a layer of a second organic semiconductor material over the conformal layer, at least some of the layer of the second organic semiconductor material directly contacting the conformal layer; and depositing a second electrode over the layer of the second organic semiconductor material, wherein the first organic semiconductor material is of a donor-type or an acceptor-type relative to the second organic semiconductor material, which is of the other material type.