Synthesis and photovoltaic property of a novel low band gap conjugated donor―acceptor copolymer consisting of 2,7-carbazole and (bithiophenevinyl)-(2-pyran-4-ylidenemalononitrile) (TVM)
In: Synthetic metals, Jg. 161 (2011), Heft 9-10, S. 731-736
academicJournal
- print, 26 ref
Zugriff:
A novel soluble conjugated donor-acceptor (D-A) copolymer, poly(2-(2-((E)-2(3,4-dihexyl-5-(7-methyl-9-octyl-9H-carbazole-2-yl)thiophene-2-yl)vinyl)-6((E)-2-(3,4-dihexyl-5-methylthiophen-2yl)vinyl-4H-pyran-4-ylidene)malononitrile) (CZPM), consisting of alternating 2,7-carbazole and (bithiophenevinyl)-(2-pyran-4-ylidenemalononitrile) (TVM) was synthesized by Suzuki coupling polymerization. The photophysical and photovoltaic properties of the copolymer were investigated. The UV-vis absorption spectrum and cyclic voltammetry measurements ofCZPM film showed that the copolymer has a relatively low band gap (1.81 eV) and a deep highest occupied molecular orbital (HOMO) level (-5.55 eV). Bulk heterojunction photovoltaic devices were fabricated using CZPM as donor and (6,6)-phenyl C61-butyric acid methyl ester (PCBM) as acceptor with the weight blend ratio ranging from 1:1 to 1:4. The device with the blend ratio of 1:2 between CZPM and PCBM exhibited an open-circuit voltage (Vc) of 0.74V and a power conversion efficiency (PCE) of 0.1% under simulated AM 1.5 solar irradiation (100 mW/cm2). The relatively low conversion efficiency of the device is attributed to the ineffective exciton dissociation at the CZPM/PCBM interface and the imperfect film-forming property of the polymer resulting from the low molecular weight.
Titel: |
Synthesis and photovoltaic property of a novel low band gap conjugated donor―acceptor copolymer consisting of 2,7-carbazole and (bithiophenevinyl)-(2-pyran-4-ylidenemalononitrile) (TVM)
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Autor/in / Beteiligte Person: | QIANG, LI ; LEIJING, LIU ; ZHAOYANG, LIU ; ZAIFANG, LI ; WEIDONG, CHENG ; SHANPENG, WEN ; PENGFEI, LI ; ZIJIAN, LI ; WENJING, TIAN |
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Zeitschrift: | Synthetic metals, Jg. 161 (2011), Heft 9-10, S. 731-736 |
Veröffentlichung: | Amsterdam: Elsevier, 2011 |
Medientyp: | academicJournal |
Umfang: | print, 26 ref |
ISSN: | 0379-6779 (print) |
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