Ladder-type heteroacene polymers bearing carbazole and thiophene ring units and their use in field-effect transistors and photovoltaic cells
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- Ladder-type heteroacene polymers bearing carbazole and thiophene ring units and their use in field-effect transistors and photovoltaic cells
- Cheedarala, Ravi Kumar; Kim, Gi-Hwan; Cho, Shinuk; Lee, Junghoon; Kim, Jonggi; Song, Hyun-Kon; Kim, Jin Young; Yang, Changduk
- Benzothiadiazoles; Building blockes; Bulk heterojunction; Charge transport properties; Donor-acceptor copolymers; Electron-donating; Field-effect; Field-effect mobilities; In-field; Molecular entities; Organic electronic devices; Oxidative couplings; Power conversion efficiencies; Structural component; Suzuki polycondensation; Thiophene ring
- Issue Date
- ROYAL SOC CHEMISTRY
- JOURNAL OF MATERIALS CHEMISTRY, v.21, no.3, pp.843 - 850
- A family of ladder-type p-excessive conjugated monomer (dicyclopentathienocarbazole (DCPTCz)) integrating the structural components of carbazole and thiophene into a single molecular entity is synthesized and polymerized by oxidative coupling to yield poly(dicyclopentathienocarbazole) (PDCPTCz). Moreover, through the careful selection of 2,1,3-benzothiadiazole unit as a pi-deficient building block, the dicyclopentathienocarbazole-based donor-acceptor copolymer (poly(dicyclopentathienocarbazole-alt-2,1,3-benzothiadiazole) (PDCPTCz-BT)) is prepared by Suzuki polycondensation. The optical, electrochemical, and field-effect charge transport properties of the resulting polymers (PDCPTCz and PDCPTCz-BT) are not only characterized in detail but also their bulk-heterojunction (BHJ) solar cell in combination with PC(71)BM are evaluated. The values of field-effect mobility (m) for PDCPTCz and PDCPTCz-BT are 8.7 x 10(-6) cm(2) V(-1) s(-1) and 2.7 x 10(-4) cm(2) V(-1) s(-1), respectively. A power conversion efficiency (PCE) of 1.57% is achieved on the PDCPTCz-BT/PC(71)BM device, implying that the push-pull copolymers based on ladder-type dicyclopentathienocarbazole as an electron-donating moiety are promising for organic electronic devices.
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