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Dithienopyrrole-based monomers as an acceptor unit building for synthesis of donor – acceptor conjugated polymers

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A new monomer of N-benzoyl dithieno[2,3- b:2’,3’-d]pyrrole (BDP), has been successfully prepared via copper-catalyzed amidation. Then, this monomer was brominated to form 2,6- dibromo-n-benzoyl dithieno[2,3-b:2’,3’- d]pyrrole (DiBDP) monomer. The structures of monomers were confirmed via the nuclear magnetic resonance (1HNMR) and Fourier transform infrared (FT-IR). BDP and DiBDP monomers will be used as monomers for Suzuki polycondensation reaction to synthesize the donor-acceptor (D-A) conjugated polymers. | SCIENCE & TECHNOLOGY DEVELOPMENT, Vol.19, No.K5 - 2016 Dithienopyrrole-based monomers as an acceptor unit building for synthesis of donor – acceptor conjugated polymers Tam Huu Nguyen 2 Thu Anh Nguyen 1 Viet Quoc Nguyen 1 Trung Thanh Nguyen 2 Ha Tran Nguyen 2 1 National Key Lab of Polymer and Composite Materials, VNU-HCM. 2 Faculty of Materials Technology, HCM city University of Technology,VNU-HCM. (Manuscript Received on October 27th, 2015, Manuscript Revised July 04th, 2016) ABSTRACT A new monomer of N-benzoyl dithieno[2,3b:2’,3’-d]pyrrole (BDP), has been successfully monomers were confirmed via the nuclear magnetic resonance (1HNMR) and Fourier prepared via copper-catalyzed amidation. Then, this monomer was brominated to form 2,6- transform infrared (FT-IR). BDP and DiBDP monomers will be used as monomers for Suzuki dibromo-n-benzoyl polycondensation reaction to synthesize the dithieno[2,3-b:2’,3’- d]pyrrole (DiBDP) monomer. The structures of donor-acceptor (D-A) conjugated polymers. Keywords: Donor-acceptor (D-A) conjugated polymers, Polymeric solar cells, Suzuki polycondensation. 1. INTRODUCTION Polymer solar cells (PSCs) have attracted great interests in both academic and industry because of their various distinctive advantages including flexibility, simple manufacturing techniques, ability to incorporate other technologies, low material cost [1]. At the meantime, despite of their advantages, PSCs have some drawback and other technical limitations that they have low stability, low power conversion efficiency and short lifetime Trang 98 [2]. Consequently, enormous efforts have been devoted to overcome these weaknesses as well as to improve the operated efficiency of PSCs. An effective way to broaden absorption of PSCs is to narrow their band gaps. Recently, one of the most concerned research direction to do so is to alternatively bind an electron-rich units (D) and an electron-deficient units (A) into the same polymer .