Journal
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
Volume 51, Issue 8, Pages 1843-1851Publisher
WILEY
DOI: 10.1002/pola.26567
Keywords
charge transfer; conjugated polymers; naphthalene; funct- ionalization of polymers; organic solar cells; quinoxaline; synthesis
Categories
Funding
- Basic Science Research Program through the National Research Foundation of Korea [2011-0013277]
- MEST
- New & Renewable Energy Program of the KETEP [20103020010050]
- MKE, Republic of Korea
- National Research Foundation of Korea [2011-0013277] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Two new quinoxaline-based polymers, poly[1,5-didecyloxynaphthalene-alt-5,5-(5,8-dithiophen-2-yl)-2,3-bis(4-octyloxyphenyl)quinoxaline (PNQx-p) and poly[1,5-didecyloxynaphthalene-alt-5,5-(5,8-dithiophen-2-yl)-2,3-bis(3-octyloxyphenyl)quinoxaline (PNQx-m), were synthesized by Suzuki coupling reaction and characterized. Thermogravimetric analysis revealed that these polymers are thermally stable with degradation temperature up to 320 degrees C. As evident from the electrochemical and optical studies, the copolymers have comparable optical band gap (approximate to 2 eV) and nearly similar deep highest occupied molecular orbital (HOMO) energy levels of 5.59 (PNQx-p) and 5.61 eV (PNQx-p). The resulting copolymers possessed relatively low HOMO energy levels promising good air stability and high open circuit voltage (Voc) for photovoltaic applications. The optimized photovoltaic device with a structure of ITO/PEDOT:PSS/PNQx-m:PC71BM (1:2, w/w)/LiF/Al shows a power conversion efficiency up to 2.29% with a short circuit current density of 5.61 mA/cm2, an Voc of 0.93 V and a fill factor of 43.73% under an illumination of AM 1.5, 100 mW/cm2. The efficiency of the PNQx-m polymer improved from 2.29 to 2.95% using 1,8-diiodoocane as an additive (0.25%). (c) 2013 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2013, 51, 1843-1851
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