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The determination of the optical constants n(λ) and k(λ) for organic bulk heterojunction (BHJ) active layers from standard solar cell measurements is presented. We show for a small molecule based as well as for polymer solar cells that the complex refractive index can be derived from the external quantum efficiency (EQE) in combination with current–voltage curves obtained from a series of devices...
Using the example of Diindenoperylene (DIP) a strong dependence of ionization potential, electron affinity and transport gap on the growth conditions of an organic molecular thin film is demonstrated. DIP single crystals show a remarkable polymorphism as single crystals as well as crystalline films on weakly interacting substrates like Au or SiO 2 surfaces. We have investigated DIP thin films...
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