Solid Film versus Solution-Phase Charge-Recombination Dynamics of exTTF–Bridge–C60 Dyads
作者:Samantha Handa、Francesco Giacalone、Saif A. Haque、Emilio Palomares、Nazario Martín、James R. Durrant
DOI:10.1002/chem.200401312
日期:2005.12.9
recombination dynamics for the solid films are observed to be tenfold faster than in solution, with this acceleration attributed to enhanced electronic coupling between the geminate radical pair in the solid film. In contrast, for dyad 2, the recombination dynamics in the solid film exhibit a lifetime of 7 micros, tenfold slower than that observed for this dyad in solution. These slow recombination dynamics
在溶液中和溶液中比较了两个exTTF-C60二元组(exTTF = 9,10-双(1,3-二硫醇-2-亚基)-9,10-二氢蒽)的电荷复合动力学。固态。二元组仅在供体(exTTF)和受体(C60)部分之间的桥的共轭程度上不同。在溶液中,与共轭二聚体C60-TVB-exTTF(2)相比,非共轭二聚体C60-BN-exTTF(1)(BN = 1,1'-联萘)的光激发显示出较慢的电荷重组动力学(TVB =二噻吩基乙烯基苯) (分别为24和0.6微米的寿命),与预期的共轭二元体中较强的电子耦合相符。但是,在固态胶片中,动力学变化很大,二分体2的重组动力学比1慢。对于二分体1,观察到固体膜的重组动力学比溶液中的动力学快十倍,这种加速归因于固体膜中双自由基对之间增强的电子耦合。相反,对于二元组2,固体膜中的重组动力学寿命为7微米,比溶液中该二元组的寿命慢十倍。这些缓慢的重组动力学归因于最初形成的双联自