Patent ID: 9666818
Date: 2017-05-30
CPC Classifications: B82Y,H01L,Y02E

Claim:
1. A tandem-type organic photoelectric conversion element comprising at least a first electrode, a second electrode and a plurality of bulk hetero junction layers each containing an n-type semiconductor material and a p-type semiconductor material, wherein, the plurality of bulk hetero junction layers contains a first bulk hetero junction layer and a second bulk hetero junction layer, provided, that the second bulk hetero junction layer absorbs a light of longer wavelength than the first bulk hetero junction layer, and that a LUMO level in a film state of the n-type semiconductor material of the first bulk hetero junction layer (LUMO(n1)) and a LUMO level in a film state of the n-type semiconductor material of the second bulk hetero junction layer (LUMO(n2)) satisfy Expression (1): wherein, the n-type semiconductor material contained in the first bulk hetero junction layer and the second bulk hetero junction layer is a compound having fullerene C60 as a parent fullerene compound, wherein the LUMP level in a film state of the n-type semiconductor material of the first bulk hetero junction layer (LUMO(n1)) satisfies Expression (3): and wherein the n-type semiconductor material contained in the second bulk hetero junction layer has a band gap of 1.5 to 1.0 eV.