The synthesis and electrochemical and optical characterizations of four new 4H-pyranylidene-based push-pull molecules are reported herein as well as their evaluation as donor materials for organic photovoltaics. Studied systems exhibit good absorption properties and appropriate LUMO levels for a photoinduced electron transfer to C₆₀. Bilayer organic solar cells fabricated from these new donors and C₆₀ as the acceptor gave photocurrent however with low power conversion efficiencies. As shown by X-ray diffraction and theoretical calculations, titled molecules present a twisted structure which may prevent the formation of suitable π-π contacts between adjacent molecules hence explaining their low photovoltaic performance.

本文报道了四个新的基于4 H-吡喃基的推挽分子的合成，电化学和光学表征，以及它们作为有机光伏的供体材料的评估。研究的系统表现出良好的吸收性能和适当的LUMO含量，可将光诱导的电子转移至C ₆₀。由这些新的供体和C ₆₀作为受体制造的双层有机太阳能电池产生光电流，但是功率转换效率低。如X射线衍射和理论计算所示，标题分子具有扭曲的结构，该结构可能会阻止相邻分子之间形成合适的π-π接触，从而解释了其低光伏性能。