The novel methyl-substituted dicyanovinyl-capped quinquethiophenes <b>1</b>–<b>3</b> led to highly efficient organic solar
cells with power conversion efficiencies of 4.8–6.9%. X-ray
analysis of single crystals and evaporated neat and blend films gave
insights into the packing and morphological behavior of the novel
compounds that rationalized their improved photovoltaic performance