Cover Picture: Liquid‐Crystalline Rigid‐Core Semiconductor Oligothiophenes: Influence of Molecular Structure on Phase Behaviour and Thin‐Film Properties (Chem. Eur. J. 36/2007)

Push–pull thiophene-based small molecules with donor and acceptor units of varying strength for photovoltaic application: beyond P3HT and PCBM

“…In T7SBz-Bz 2 , the presence of sulfur atoms in the alkyl chains of the thiophene units induces a partial order, indeed the diffraction profile shows only one peak (2.4 nm) as usual for mesomorphic materials. 47 Substitution of the peripheral A units of T7Bz-Bz 2 with Dp or TSO appears to induce a higher propensity to form ordered arrays. Indeed, the pattern obtained after replacing peripheral Bz units with Dp shows only three peaks at 5.31, 10.51, 15.81, all belonging to a periodicity of 1.7 nm, suggesting the presence of a highly oriented film or a layer ordered smectic system.…”