Special Section on Solution-Processable Organic Solar Cells

π-conjugated donor–acceptor porphyrin copolymers for organic photovoltaics

[+] Author Affiliations
Xiaobin Peng

South China University of Technology, Institute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, 381 Wushan Road, Guangzhou 510640, China

Yuying Huang

South China University of Technology, Institute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, 381 Wushan Road, Guangzhou 510640, China

Lisheng Li

South China University of Technology, Institute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, 381 Wushan Road, Guangzhou 510640, China

Yong Cao

South China University of Technology, Institute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, 381 Wushan Road, Guangzhou 510640, China

J. Photon. Energy. 5(1), 057202 (Dec 02, 2014). doi:10.1117/1.JPE.5.057202
History: Received August 20, 2014; Accepted October 23, 2014
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Abstract.  Conjugated donor–acceptor (D-A) molecular structures play a very important role in the significant progress of organic photovotaics. However, the reports on conjugated D-A porphyrin polymers for organic solar cells are very limited. In this work, five conjugated D-A porphyrin copolymers PEZPEBTA(C12), PEZPEBT, PEZPEBTff, PEZPETPD(O), and PEZPETDPPT(O) were synthesized by Sonagashira coupling of a porphyrin donor unit with five typical acceptor units 2-dodecyl-2H-benzotriazole, benzo[1,2,5]thiadiazole, 5,6-difluoro-benzo[1,2,5]thiadiazole, 5-octyl-thieno[3,4-c]pyrrole-4,6-dione, and 3,6-bis-(thiophen-2-yl)-2,5-dioctyl-2,5-dihydro-pyrrolo[3,4-c]pyrrole-1,4-dione linked by ethynylene linkages, respectively. They possess excellent thermal stability with a decomposition temperature of around 400°C. All absorption spectra of the copolymers were significantly red shifted with enhanced Q bands at the near-infrared region both in solutions and in films due to the simultaneous introduction of ethynylene linkages and acceptor units, which make the polymer main chains coplanar and π-conjugated and enhance the intramolecular charge transfer. PEZPEBT and PEZPEBTff are electrochemically active in both the oxidation and reduction regions, while PEZPEBTA(C12), PEZPETPD(O), and PEZPETDPPT(O) show only oxidation peaks. Power conversion efficiencies of 0.12%, 0.41%, 0.26%, 0.19%, and 0.41% were achieved for the polymer solar cells based on PEZPEBTA(C12), PEZPEBT, PEZPEBTff, PEZPETPD(O), and PEZPETDPPT(O), respectively, under AM 1.5, 100mW/cm2 with methanofullerene [6,6]-phenyl C61-butyric acid methyl ester (PC61BM) (1:2, w/w) as the active layer in the presence of 3% pyridine.

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© 2015 Society of Photo-Optical Instrumentation Engineers

Citation

Xiaobin Peng ; Yuying Huang ; Lisheng Li and Yong Cao
"π-conjugated donor–acceptor porphyrin copolymers for organic photovoltaics", J. Photon. Energy. 5(1), 057202 (Dec 02, 2014). ; http://dx.doi.org/10.1117/1.JPE.5.057202


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