ITO-free large-area organic solar cells

We report on large-area pentacene / C-60 organic solar cells in which indium-tin-oxide (ITO) is replaced with a conductive polymer electrode and a 5 mu m-thick metal grid is used to reduce resistive power losses. The performance of cells with the polymer electrode was compared with that of pentacene / C-60 devices using ITO as the transparent electrode. For large-area devices (7.3 cm(2)) on glass substrates with an integrated metal grid, the performance of a device with the polymer electrode is comparable to that of a device with an ITO electrode combined with a grid. (C) 2010 Optical Society of America