Photosensitive organic semiconductor compositions
View Patent ↗The present invention relates to a photosensitive organic semiconductor composition comprising an organic p-type semiconductor pigment with a p-type conducting polymer, wherein the ionization potentials of the organic p-type semiconductor pigment and the p-type conducting polymer are nominally equivalent and a photosensitive organic semiconductor composition comprising an organic n-type semiconductor pigment with an n-type conducting polymer, wherein the electron affinities of the organic semiconductor pigment and the conducting polymer are nominally equivalent. The present invention also relates to a p/n heterojunction utilizing the photosensitive organic semiconductor compositions.
1. A photosensitive organic semiconductor composition comprising at least one organic n-type (electron acceptor) semiconductor pigment and at least one n-type (electron acceptor) conducting polymer, wherein said at least one organic n-type (electron acceptor) semiconductor pigment and said at least one n-type (electron acceptor) conducting polymer have electron affinities that differ by less than 0.5 eV.
2. The photosensitive organic semiconductor composition of claim 1 wherein said at least one organic n-type (electron acceptor) semiconductor pigment exhibits high absorption for visible and near infrared radiation.
3. The photosensitive organic semiconductor composition of claim 1 wherein said at least one organic n-type (electron acceptor) semiconductor pigment comprises nanometer-sized crystals and said crystals are dispersed in the n-type conducting polymer.
4. The photosensitive organic semiconductor composition of claim 1 wherein said at least one organic n-type (electron acceptor) semiconductor pigment has a particle sizes of less than 0.5 micron in length.
5. The photosensitive organic semiconductor composition of claim 1 wherein said at least one organic n-type (electron acceptor) semiconductor pigment comprises from 0.01 to 90 weight percent, based on the dry weight of a layer comprising said pigment.
6. The photosensitive organic semiconductor composition of claim 1 wherein said at least one organic n-type (electron acceptor) semiconductor pigment is an aromatic imide derived from 3,4,9,10-perylenetetracarboxylic dianhydride (PTDA).
7. The photosensitive organic semiconductor composition of claim 1 wherein said at least one organic n-type (electron acceptor) semiconductor pigment is a perylenediimide.
8. The photosensitive organic semiconductor composition of claim 1 wherein said at least one n-type (electron acceptor) conducting polymer exhibits weak or no absorption of visible or near infrared light.
9. The photosensitive organic semiconductor composition of claim 1 wherein said at least one n-type (electron acceptor) conducting polymer is a conjugated polymer or a non-conjugated conducting polymer.
10. The photosensitive organic semiconductor composition of claim 1 wherein said at least one n-type (electron acceptor) conducting polymer is poly(cyanophenylenevinylene).
11. The photosensitive organic semiconductor composition of claim 1 further comprising solvent.
12. The photosensitive organic semiconductor composition of claim 4 wherein said electron affinity of said at least one organic n-type (electron acceptor) semiconductor pigment and the electron affinity of said at least one n-type (electron acceptor) conducting polymer differ by less than 0.2 eV.
13. The photosensitive organic semiconductor composition of claim 1 wherein said electron affinity of said at least one organic n-type (electron acceptor) semiconductor pigment and the electron affinity of said at least one n-type (electron acceptor) conducting polymer differ by less than 0.1 eV.
14. The photosensitive organic semiconductor composition of claim 1 wherein said at least one organic n-type (electron acceptor) semiconductor pigment has a particle sizes of less than 0.2 micron in length.
15. The photosensitive organic semiconductor composition of claim 1 wherein said at least one organic n-type (electron acceptor) semiconductor pigment has a particle sizes of less than 0.1 micron in length.
16. The photosensitive organic semiconductor composition of claim 12 wherein said at least one n-type (electron acceptor) conducting polymer is a non-conjugated conducting polymer containing pendant groups of an aromatic imide derived from 1,4,5,8-naphthalenetetracarboxylic dianhydride.