Journal
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
Volume 49, Issue 14, Pages 3129-3137Publisher
WILEY
DOI: 10.1002/pola.24750
Keywords
conducting polymers; conjugated polymers; polymer solar cells; thiazolothiazole-based polymers; thin films
Categories
Funding
- Ministry of Knowledge Economy (MKE) [M2009010025]
- Converging Research Center Program through the Ministry of Education, Science and Technology, Republic of Korea [2010K000970]
- Korea Evaluation Institute of Industrial Technology (KEIT) [K0006060] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2010-50177] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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A novel series of thiazolothiazole (Tz)-based copolymers, poly[9,9-didecylfluorene-2,7-diyl-alt-2,5-bis-(3-hexylthiophene-2-yl)thiazolo[5,4-d]thiazole] (P1), poly[9,9-dioctyldibenzosilole-2,7-diyl-alt-2,5-bis-(3-hexylthiophene-2-yl)thiazolo[5,4-d]thiazole] (P2), and poly[4,4'-bis(2-ethylhexyl)-dithieno[3,2-b:2',3'-d]silole-alt-2,5-bis-(3-hexylthiophene-2-yl)thiazolo[5,4-d]thiazole] (P3), were synthesized for the use as donor materials in polymer solar cells (PSCs). The field-effect carrier mobilities and the optical, electrochemical, and photovoltaic properties of the copolymers were investigated. The results suggest that the donor units in the copolymers significantly influenced the band gap, electronic energy levels, carrier mobilities, and photovoltaic properties of the copolymers. The band gaps of the copolymers were in the range of 1.80-2.14 eV. Under optimized conditions, the Tz-based polymers showed power conversion efficiencies (PCEs) for the PSCs in the range of 2.23-2.75% under AM 1.5 illumination (100 mW/cm(2)). Among the three copolymers, P1, which contained a fluorene donor unit, showed a PCE of 2.75% with a short-circuit current of 8.12 mA/cm(2), open circuit voltage of 0.86 V, and a fill factor (FF) of 0.39, under AM 1.5 illumination (100 mW/cm(2)). (C) 2011 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 49: 3129-3137, 2011
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