| abstract |
And a photoactive region sandwiched between the first electrode, the second electrode, and the first electrode and the second electrode. The photoactive region comprises a mixture of an organic acceptor material and an organic donor material, and is in direct contact with the first organic layer having a layer thickness less than or equal to 0.8 characteristic charge transport length, and A non-mixed layer of an organic acceptor material or an organic donor material, and a second organic layer having a layer thickness of about 0.1 light absorption length or more. Preferably, the first organic layer has a layer thickness not greater than 0.3 characteristic charge transport length. Preferably, the second organic layer has a layer thickness of about 0.2 light absorption length or more. Embodiments of the present invention have a power efficiency of 2% or higher, more preferably 5% or higher. |