The sun provides many times the energy we need, making it the most promising energy source. Conversion of sunlight to electrical energy is obtained in photovoltaic (PV) devices. Organic Solar Cells represent a new class of PV devices in which organic molecules serve as semiconductor materials. Although there has been huge progress in the performance of these devices, the physical fundamentals of charge transport still require a complete description. The author developed a powerful and novel method to investigate the cross section of electronic devices using in-situ focused ion beam...