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Synthesis and photovoltaic properties of copolymers based on diketopyrrolopyrrole with broad absorption and high open-circuit voltage
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Chemical Sciences Journal

ISSN: 2150-3494

Open Access

Synthesis and photovoltaic properties of copolymers based on diketopyrrolopyrrole with broad absorption and high open-circuit voltage


2nd World Chemistry Conference

August 08-10, 2016 Toronto, Canada

SongtingTan

Xiangtan University, P R China

Posters & Accepted Abstracts: Chem Sci J

Abstract :

A series of donorâ??acceptor (Dâ??A) conjugated polymers based on alkylthienyl-substituted benzodithiophene (BDTT) as electron-rich unit, diketopyrrolopyrrole (DPP) and DPP based side chain (TTDPP) as electron-deficient units have been designed and synthesized by Stille-coupling reaction. Compared with the binary copolymers, the random terpolymers exhibited broader absorption range. By tuning the ratio of DPP and TTDPP, the photophysical, electrochemical properties, lamellar distance, Ï?â??Ï?* stacking distance and photovoltaic properties of the random terpolymers were changed dramatically. Bulk heterojunction polymer solar cells based on the as-synthesized copolymers as electron donors and (6,6)-phenyl-C61butyric acid methyl ester (PC61BM) as the acceptor were fabricated. The best power conversion efficiency (PCE) of 4.46% (a short-circuit current (Jsc) of 12.05 mA cmâ??2, an open-circuit voltage (Voc) of 0.77 V and a fill factor (FF) of 49.0%) was obtained from terpolymer P4. As well as optimization on device performance via solution vapor annealing (SVA) are investigated. The binary copolymer P2 obtained the best power conversion efficiency (PCE) of 4.74% with the Jsc of 10.63 mA cmâ??2, a high Voc of 0.88 V and a FF of 51.0%. tanst2008@163.com

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