Organic optoelectronic device electrodes with nanotubes
An electrode for use in an organic optoelectronic device is provided. The electrode includes a thin film of single-wall carbon nanotubes. The film may be deposited on a substrate of the device by using an elastomeric stamp. The film may be enhanced by spin-coating a smoothing layer on the film and/or doping the film to enhance conductivity. Electrodes according to the present invention may have conductivities, transparencies, and other features comparable to other materials typically used as electrodes in optoelectronic devices.
1. A method for manufacturing an optoelectronic device, comprising:
preparing a suspension of nanotubes;
filtering the suspension to form a thin film of nanotubes on a filtration membrane;
doping the thin film of nanotubes with SOCl 2 ;
depositing the thin film over a substrate forming a first electrode of the optoelectronic device;
depositing a smoothing layer on the thin film of nanotubes;
depositing an organic layer over the smoothing layer; and
depositing a second electrode of the optoelectronic device over the organic layer.
2. The method of claim 1 , wherein doping the thin film of nanotubes with SOCl 2 comprises immersing the thin film of nanotubes on the filtration membrane in SOCl 2 solvent.
3. The method of claim 2 , further comprising drying the thin film of nanotubes in N 2 .
4. The method of claim 2 , wherein the thin film of nanotubes on the filtration membrane is immersed in SOCl 2 solvent for twelve hours.
5. The method of claim 4 , further comprising drying the thin film of nanotubes in N 2 .
6. The method of claim 1 , wherein depositing the thin film of nanotubes over the substrate comprises:
transferring the thin film from the filtration membrane to an elastomeric stamp; and
pressing the elastomeric stamp onto the substrate to transfer the thin film from the elastomeric stamp to the substrate.
7. The method of claim 1 , wherein preparing the suspension of nanotubes comprises agitating the suspension.
8. The method of claim 7 , wherein the suspension is agitated ultrasonically.
9. The method of claim 1 , wherein preparing the suspension comprises functionalizing the nanotubes in the suspension.
10. The method of claim 1 , wherein the nanotubes are arc discharge nanotubes.
11. The method of claim 1 , wherein depositing the smoothing layer comprises spin-coating the smoothing layer on the thin film.
12. The method of claim 11 , wherein the thin film is smoothed to an rms roughness of not more than 3.1 nm after the smoothing layer is deposited.
13. The method of claim 1 , further comprising patterning the thin film to form a plurality of pixels of the optoelectronic device.
14. The method of claim 1 , wherein the organic layer is an emissive layer.
15. The method of claim 1 , wherein the organic layer is a photoactive layer.