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Polymer Chemistry Vol - 3 Issue - 2

Polymer Chemistry Vol -2

Polymer Chemistry Vol -1

Tuning the photovoltaic parameters of thiophene-linked donor–acceptor liquid crystalline copolymers for organic photovoltaics

Content Provider	Royal Society of Chemistry (RSC)
Author	Li, Fan Li, Yongfang Yao, Kai Chen, Yiwang Ren, Xingye Wang, Hongming Chen, Lie
Copyright Year	2012
Abstract	Three new donor–acceptor copolymers containing the electron acceptor di-2-thienyl-2′,1′,3′-benzothiadiazole (DTBT) linked to the electron donors 9,9-bis[6-(4′-hexyloxy-terphenyloxy)-hexyl]-fluorene (Ftp) with terphenyl mesogen side chain viathiophene units are synthesized to study polymer structure–properties relationships in organic photovoltaic devices. All the random copolymers (PFtpTDTBT-a, b, c) were prepared via Stille polycondensations based on variable contents of DTBT and Ftp. The results of absorption spectra, fluorescence spectra and electrochemistry shows that increasing the ratio of fluorine units and decreasing the electron withdrawing groups of DTBT not only control the bandgaps but also the liquid crystallinity of the copolymers. The structural variation of mesomorphism behaviors induced by terphenyl pendants is characterized by POM, DSC, XRD and polarized absorption. When the polymers were blended with fullerene derivative as an electron acceptor, the photovoltaic performance reveals the good correlation between the Ftp and DTBT ratio in the main chain of the copolymers with desirable HOMO levels and the open circuit voltage (Voc). Therefore, the deepest HOMO energy level of polymer PFtpTDTBT-a leads to the highest Voc of 0.86 V, while the polymer PFtpTDTBT-c possesses a superior absorption coefficient resulting in the largest short current density (Jsc = 4.58 mA cm−2). Additionally, the packing alignments of the three polymers guided by the orientation of mesogenic pendants pose a significantly effect on the morphology with different microphase separation after annealing treatment. Nevertheless, the solar cell based on PFtpTDTBT-b shows the best performance among the thiophene incorporated polymers, which demonstrated the importance of designing materials with a balance in the properties of HOMO/LUMO energy levels, the absorption coefficient and morphological variations.
Starting Page	710
Ending Page	717
Page Count	8
File Format	HTM / HTML PDF
ISSN	17599954
Volume Number	3
Issue Number	3
Journal	Polymer Chemistry
DOI	10.1039/c2py00523a
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Fluorene HOMO\/LUMO Fluorine Fluorescence Polymer Stille Thiophene Terphenyl POM Solar cell X-ray crystallography DSC Attenuation coefficient Electrochemistry Fullerene chemistry Mesogen Electric current Electron acceptor Nucleic acid thermodynamics
Content Type	Text
Resource Type	Article
Subject	Organic Chemistry Biochemistry Bioengineering Biomedical Engineering Polymers and Plastics

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