| Summary: | The operation and the design of organic solar cells with donor/acceptor heterojunction structure and exciton blocking layer is outlined and results of their initial development and assessment are reported. Under halogen lamp illumination with 100 mW/cm<sup>2</sup> incident optical power density, the devices exhibits an open circuit voltage V<sub>OC</sub> = 0.45 V, a short circuit current density J<sub>SC</sub> between 2 and 2.5 mA/cm<sup>2</sup> with a fill factor FF ≈ 50%, an external quantum efficiency (electrons/s over incident photons/s) EQE ≈ 5% and a power conversion efficiency of about 0.5%. Measurements of the photoelectrical characteristics with time are also reported, confirming that non encapsulated organic solar cells have limited stability in ambient atmosphere.
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