Low band gap dithienogermolodithiophene copolymers with tunable acceptors and side-chains for organic solar cells

作者：Zhong Hongliang; Li Zhe; Buchaca Domingo Ester; Ros**auer Stephan; Watkins Scott E; Stingelin Natalie; Anthopoulos Thomas D; Heeney Martin^*

来源：Journal of Materials Chemistry A, 2013, 1(47): 14973-14981.

DOI：10.1039/c3ta13778c

We report the synthesis and characterisation of five new donor-acceptor type co-polymers based on a fused dithienogermolodithiophene unit for use in photovoltaic devices. The influence of three electron deficient co-monomers, as well as the length and variety of the solubilising side-chains, on the physical and optoelectronic properties of the polymers is reported. The number and variety of alkyl side-chains is found to have a significant impact on the polymer aggregation and film morphology, with larger and more bulky side-chains leading to improved solubility and molecular weight. The influence of these properties upon the performance of bulk heterojunction solar cells is shown.

• 出版日期2013
• 单位CSIRO