The present invention relates to an organic solar cell which comprises at least one photoactive region which comprises at least one indanthrene compound which is in contact with at least one fullerene compound, and to the use of indanthrene compounds in organic photovoltaics, especially in the form of a component cell of a tandem cell. A first distally tapered portion joins the first segment and the second segment, and a second distally tapered portion is distal of the second segment. The first and second processors are operably coupled with a bus configured to transmit digital signals therebetween. Specifically, some embodiments optimize cells in a reverse-levelized cell ordering. A distribution center is also determined utilizing the graphical user interface. A recordable optical recording medium includes a substrate, and on the substrate, a reflective layer, a recording layer, a protective layer, a light transmission layer in a single layer structure having optical transparency, and a hard coat layer.