Inverted organic photosensitive devices
View Patent ↗The present disclosure relates to organic photosensitive optoelectronic devices grown in an inverted manner. An inverted organic photosensitive optoelectronic device of the present disclosure comprises a reflective electrode, an organic donor-acceptor heterojunction over the reflective electrode, and a transparent electrode on top of the donor-acceptor heterojunction.
1. An inverted photosensitive device comprising:
a reflective substrate;
a surface-treated transparent electrode over the reflective substrate;
an organic donor-acceptor heterojunction over said surface-treated transparent electrode; and
an electrode over said donor-acceptor heterojunction,
wherein the inverted photosensitive device is an organic solar cell.
2. The inverted photosensitive device of claim 1 , wherein the donor of the organic donor-acceptor heterojunction comprises a material selected from phthalocyanines, porphyrins, subphthalocyanines, and derivatives or transition metal complexes thereof.
3. The inverted photosensitive device of claim 1 , wherein the donor of the donor-acceptor heterojunction comprises copper phthalocyanine.
4. The inverted photosensitive device of claim 1 , wherein the acceptor of the organic donor-acceptor heterojunction comprises a material selected from polymeric and non-polymeric perylenes, polymeric and non-polymeric naphthalenes, and polymeric and non-polymeric fullerenes.
5. The inverted photosensitive device of claim 1 , wherein the acceptor of the organic donor-acceptor heterojunction comprises 3,4,9,10-perylenetetracarboxylic bis-benzimidazole.
6. The inverted photosensitive device of claim 1 , wherein the transparent electrode comprises a material selected from transparent oxides and metal or metal substitutes.
7. The inverted photosensitive device of claim 6 , wherein the transparent electrode permits at least about 50% of ambient electromagnetic radiation to be transmitted through said electrode.
8. The inverted photosensitive device of claim 6 , wherein the transparent electrode comprises a material selected from tin oxide, gallium indium tin oxide, and zinc indium tin oxide.
9. The inverted photosensitive device of claim 1 , wherein the device further comprises an exciton blocking layer.
10. The inverted photosensitive device of claim 9 , wherein the exciton blocking layer comprises a material selected from N,N′-diphenyl-N,N′-bis-alpha-naphthylbenzidine, aluminum tris (8-hydroxyquinoline), carbazole biphenyl, bathocuproine, and tris(acetylacetonato) ruthenium (III).
11. The inverted photosensitive device of claim 1 , wherein the organic donor-acceptor heterojunction comprises a structure selected from planar heterojunctions, bulk heterojunctions, nanocrystalline bulk heterojunctions, hybrid planar-mixed heterojunctions, and mixed heterojunctions.
12. The inverted photosensitive device of claim 1 , wherein the device further comprises at least one additional organic donor-acceptor heterojunction to create a tandem device.
13. The inverted photosensitive device of claim 1 , wherein the reflective substrate comprises a metal foil.