A device is provided having a first electrode, a second electrode, a first photoactive region having a characteristic absorption wavelength λ1 and a second photoactive region having a characteristic absorption wavelength λ2. The photoactive regions are disposed between the first and second electrodes,...http://www.google.com/patents/US7375370?utm_source=gb-gplus-sharePatent US7375370 - Stacked organic photosensitive devices
