NDLI: Synthesis and photovoltaic properties of two-dimension-conjugated D–A copolymers based on benzodithiophene or benzodifuran units

Content Provider	Royal Society of Chemistry (RSC)
Author	He, Chang Li, Yongfang Gao, Lei Zhang, Yi Sun, Qingjiang
Copyright Year	2013
Abstract	A series of two-dimension-conjugated D–π–A copolymers based on benzodithiophene (BDT) or benzodifuran (BDF) as the donor unit, benzothiadiazole (BT) as the acceptor unit and thiophene as the π-bridge, were designed and synthesized for application as donor materials in polymer solar cells (PSCs). The polymers include PBDTT-BT based on BDT with a thiophene side chain, PBDTF-BT based on BDT with a furan side chain, PBDFT-BT based on BDF with a thiophene side chain and PBDFF-BT based on BDF with a furan side chain. The replacement of some of the thiophene rings in the donor unit with furan rings influences the UV-vis absorption spectra, electronic energy levels and band gaps of the copolymers. The HOMO levels of the copolymers based on BDF are ca. 0.1 eV up-shifted in comparison with that of the polymers based on BDT. While the furan side chain makes the LUMO level shift downwards a little. Power conversion efficiency (PCE) of the PSCs based on the polymers as the donor and [6,6]-phenyl C71-butyric acid methyl ester (PC71BM) as the acceptor reached 1.85% for PBDTT-BT, 2.88% for PBDTF-BT, 4.42% for PBDFT-BT and 2.60% for PBDFF-BT. The results indicate that the replacement of thiophene rings by furan rings in the 2-D-conjugated BDT unit significantly influences the photovoltaic properties of the copolymers.
Starting Page	1474
Ending Page	1481
Page Count	8
File Format	HTM / HTML PDF
ISSN	17599954
Volume Number	4
Issue Number	5
Journal	Polymer Chemistry
DOI	10.1039/c2py20910a
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Furan BT Group HOMO\/LUMO BDF HOMO LUMO Electronvolt Polymer Thiophene Phenyl group Solar cell Ester BDT Carboxylic acid Electron donor
Content Type	Text
Resource Type	Article
Subject	Organic Chemistry Biochemistry Bioengineering Biomedical Engineering Polymers and Plastics

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