Abstract
A small molecule and a polymer based on perylene diimide and thienylenevinylene were designed and synthesized. Both small molecule and polymer exhibited excellent thermal stability with decomposition temperatures of >400 °C and strong absorption in the visible region (300–800 nm). These two compounds showed highest occupied molecular orbital levels of −5.57 and −5.70 eV and lowest unoccupied molecular orbital levels of −3.72 and −3.67 eV, respectively. Solution processed fullerene-free polymer solar cells based on the small molecule acceptor and the polymer acceptor afforded power conversion efficiencies of up to 0.69% and 1.00%, respectively. Comparative studies of the absorption, energy levels, charge transport, morphology and photovoltaic properties of the small molecule and polymer were carried out.
Published Version
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