Synthesis and characterisation of fluorenone–thiophene-based donor–acceptor oligomers: role of moiety sequence upon packing and electronic properties
作者:William Porzio、Silvia Destri、Mariacecilia Pasini、Umberto Giovanella、Massimo Ragazzi、Guido Scavia、Dariusz Kotowski、Gianni Zotti、Barbara Vercelli
DOI:10.1039/c0nj00045k
日期:——
A series of oligomers constituting alternating thiophene and fluorenone residues, designed to evaluate the effect upon both electronic properties and packing of the moiety sequence in the light of donorâacceptor concept, were synthesised and studied by cyclic voltammetry, optical spectroscopy, and XRD investigations into crystals, films, and powders. Moreover, ab initio calculations, based on Density Functional Theory, were carried out on selected molecules. A clear indication of close-packing induction by fluorenone in the oligomers, together with the factors determining the electrical and optical properties, are derived and presented. In the light of the performance of selected compounds in prototypes of p-type FET devices and bulk heterojunction solar cells, some general indications of chemical structure requirements for applications such as photovoltaic cells are described.
我们合成了一系列由噻吩和芴酮残基交替构成的低聚物,旨在根据供体受体概念评估其对电子特性和分子序列堆积的影响。此外,还根据密度泛函理论对选定的分子进行了 ab initio 计算。研究清楚地表明了芴酮在低聚物中的紧密堆积诱导作用,以及决定其电学和光学特性的因素。根据所选化合物在 p 型场效应晶体管器件和块状异质结太阳能电池原型中的性能,描述了光伏电池等应用对化学结构要求的一些一般性指标。