Self assembly of conducting polymer for formation of polymer memory cell
View Patent ↗The present invention provides a selectively conductive organic semiconductor (e.g., polymer) device that can be utilized as a memory cell. A polymer solution including a conducting polymer self assembles relative to a conductive electrode. The process affords self-assembly such that a shortest conductive path can be achieved. The method includes depositing a concentrated solution of conducting polymer on a conductive surface, applying heat and optionally a vacuum, and permitting the conducting polymer to self-assemble into an organic semiconductor. The organic semiconductor can be employed within single and multi-cell memory devices by forming a structure with two or more electrodes while employing the organic semiconductor along with a passive device between the electrodes. A partitioning component can be integrated with the memory device to facilitate programming and stacking of additional memory cells on top of or in association with previously formed cells.
1. A method of processing an organic memory device, comprising:
forming a channel in a semiconductor substrate material;
forming an electrode in the channel;
mixing a polymer solution comprising a conductive polymer and an organic solvent, the polymer comprising a polar group at one end and a non-polar, conjugated chain, and
depositing the polymer solution into the channel to form an organic semiconductor layer over the electrode, the polymer orienting itself so that the polar group is proximate the electrode and the non-polar chain extending away from the electrode.
2. The method of claim 1 , further comprising mixing the polymer solution with a conductive polymer concentration to facilitate spinning the solution into the channel.
3. The method of claim 2 , further comprising heating the polymer solution to increase the conductive polymer present in the polymer solution to a suitable concentration to facilitate self-assembly of the conductive polymer on an electrode.
4. The method of claim 1 , further comprising placing the polymer solution in a vacuum to facilitate removal of the organic solvent.
5. The method of claim 1 , the organic semiconductor material comprising at least one from the group consisting of polyacetylene, polyphenylacetylene, polydiphenylacetylene, polyaniline, poly(p-phenylene vinylene), polyihiophene, polyporphyrins, porphyrinic macrocycles, thiol derivatized polyporphyrins, polymetallocenes, polyferrocenes, polyphthalocyanines, polyvinylenes and polypyrroles.
6. The method of claim 1 , wherein the electrode is formed in accordance with a damascene process.
7. The method of claim 1 , wherein the electrode is formed in accordance with at least one of a single damascene process and a dual damascene process.
8. The method of claim 1 , wherein the electrode comprises copper.