Architectures and criteria for the design of high efficiency...

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H01L 51/42 (2006.01) H01L 27/30 (2006.01)

Patent

CA 2657672

An organic photovoltaic cell includes an anode and a cathode, and a plurality of organic semiconductor layers between the anode and the cathode. At least one of the anode and the cathode is transparent. Each two adjacent layers of the plurality of organic semiconductor layers are in direct contact. The plurality of organic semiconductor layers includes an intermediate layer consisting essentially of a photoconductive material, and two sets of at least three layers. A first set of at least three layers is between the intermediate layer and the anode. Each layer of the first set consists essentially of a different organic semiconductor material having a higher LUMO and a higher HOMO, relative to the material of an adjacent layer of the plurality of organic semiconductor layers closer to the cathode. A second set of at least three layers is between the intermediate layer and the cathode. Each layer of the second set consists essentially of a different organic semiconductor material having a lower LUMO and a lower HOMO, relative to the material of an adjacent layer of the plurality of organic semiconductor layers closer to the anode.

La présente invention concerne une cellule photovoltaïque organique qui comprend une anode et une cathode, et une pluralité de couches semi-conductrices organiques entre l'anode et la cathode. Au moins une de l'anode et de la cathode est transparente. Chacune des deux couches adjacentes d'une pluralité de couches semi-conductrices organiques sont en contact direct. La pluralité de couches semi-conductrices organiques comprend une couche intermédiaire se composant essentiellement d'un matériau photoconducteur, et deux groupes d'au mois trois couches. Un premier groupe d'au moins trois couches est entre la couche intermédiaire et l'anode. Chaque couche du premier groupe se compose essentiellement d'un matériau semi-conducteur organique ayant une LUMO supérieure et une HOMO supérieure, par rapport au matériau d'une couche adjacente de la pluralité de couches semi-conductrices organiques plus proches de la cathode. Un deuxième groupe d'au moins trois couches est entre la couche intermédiaire et la cathode. Chaque couche du deuxième ensemble se compose essentiellement d'un matériau semi-conducteur organique différent ayant une LUMO inférieure et une HOMO inférieure, par rapport au matériau d'une couche adjacente de la pluralité de couches semi-conductrices organiques plus proches de l'anode.

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