Au nanodot lattices with well-controlled size and density for thin organic solar cells
Size, shape, and density-controlled metal nanostructure, Au nanodot lattices fabricated by electron beam lithography, were embedded in thin organic solar cell consisting of PC71BM:PCPDTBT. The effects of their size and density on device performance were examined. Even though dipole res-onances of Au nanodots were consistent with the absorption range of the active materials, there were no improvements in device performance under any sizes and densities. In addition, under high volume density of Au nanodots to PEDOT:PSS layer, the device performance was deteriorated. These results indicated that not only size and density but also other factors which determine light scattering characteristics greatly affect the device performance of solar cells. (© 2015 WILEY-VCH Verlag GmbH &Co. KGaA, Weinheim)