NDLI: Copolymers from benzodithiophene and benzotriazole: synthesis and photovoltaic applications

Content Provider	Royal Society of Chemistry (RSC)
Author	Li, Yongfang Liu, Bo Zhang, Zhenhua He, Yuehui Peng, Bo Pan, Chunyue Zhou, Kechao Zou, Yingping
Copyright Year	2010
Abstract	Two new alternating low bandgap copolymers from benzodithiophene and benzotriazole units, namely poly{4,8-bis(2-ethylhexyloxy)benzo[1,2-b; 3,4-b]dithiophene-2,6-diyl-alt-2-octyl-4,7-di(thiophen-2-yl)-2H-benzo[d][1,2,3]triazole-5′,5′′-diyl} (PBDTDTBTz) and poly{4,8-bis(2-ethylhexyloxy)benzo[1,2-b;3,4-b]dithiophene-2,6-diyl-alt-2-dodecylbenzotriazole-4,7-diyl} (PBDTBTz), were designed and synthesized by a typical Stille coupling polymerization method. The copolymers were characterized by thermogravimetric analysis, UV-vis absorption and cyclic voltammetry. PBDTDTBTz and PBDTBTz possess moderate molecular weights and excellent thermal properties with a 5% weight loss temperatures (Td) around 300 °C. They exhibited good optical absorption, with peaks at 527 nm and 562 nm in the film state, respectively. Photovoltaic properties of the copolymers blended with [6,6]-phenyl-C61-butyric acid methyl ester (PC61BM) or [6,6]-phenyl-C71-butyric acid methyl ester (PC71BM) as electron acceptors, were investigated. The photovoltaic device with the PBDTDTBTz/PC71BM shows a power conversion efficiency of 1.7% with a short circuit current density of 4.5 mA cm−2 and a good fill factor of 0.62, while PBDTBTz demonstrated a moderate power conversion efficiency of up to 1.4%, under the illumination of AM 1.5, 100 mW cm−2 with a device structure of ITO/PEDOT: PSS/polymer: PC71BM (1 : 4)/Ca/Al. All the above information highlighted that this kind of the copolymers is promising for the application of polymer solar cells.
Starting Page	1441
Ending Page	1447
Page Count	7
File Format	HTM / HTML PDF
ISSN	17599954
Volume Number	1
Issue Number	9
Journal	Polymer Chemistry
DOI	10.1039/c0py00136h
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Triazole Thermogravimetric analysis Poly(3,4-ethylenedioxythiophene) Polymerization Amplitude modulation Polymer Stille Phenyl-C61-butyric acid methyl ester Stille reaction Cyclic voltammetry Solar cell Ester Short circuit Carboxylic acid Band gap Electric current Benzotriazole
Content Type	Text
Resource Type	Article
Subject	Organic Chemistry Biochemistry Bioengineering Biomedical Engineering Polymers and Plastics

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