Art of Science 2009 Online Gallery  «Prev | Thumbnails | Next »

Solar Cell Cosmos
R. R. Lunt '09
Department of Chemical Engineering
Organic electronics is an emerging field that holds promise for low-cost photovoltaic applications. This image of annealed organic solar cells was taken using an optical microscope with cross-polarizers and a Nomarski filter. The two moon-like circles are metal cathodes which define the active area of the device. Thermal annealing of these thin-film devices often leads to improved power conversion efficiency. In this case, however, annealing at a temperature near the melting point of one of the constituent components led to the formation of device-ruining ridges and valleys.