Synthesis of the pyrrolo[3,2-b]pyrrole-based copolymer with enhanced open circuit voltage |
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| Authors: | Suhee Song Seo-Jin Ko Hyunmin Shin Youngeup Jin Il Kim Jin Young Kim Hongsuk Suh |
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| Affiliation: | 1. Department of Chemistry and Chemistry Institute for Functional Materials, Pusan National University, Busan 609-735, Republic of Korea;2. Interdisciplinary School of Green Energy, Ulsan National Institute of Science and Technology, Ulsan 689-798, Republic of Korea;3. Department of Industrial Chemistry, Pukyong National University, Busan 608-739, Republic of Korea;4. The WCU Center for Synthetic Polymer Bioconjugate Hybrid Materials, Department of polymer Science and Engineering, Pusan National University, Busan 609-735, Republic of Korea |
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| Abstract: | A new accepter unit, pyrrolo3,2-b]pyrrole-2,5-dione, was prepared and utilized for the synthesis of the conjugated polymer containing electron donor–acceptor pair for OPVs. Pyrrolo3,2-b]pyrrole-2,5-dione unit, regioisomer of the known pyrrolo3,4-c]pyrrole-1,4-dione, is originated from the structure of stable synthetic pigment. The new conjugated polymer with pyrrolo3,2-b]pyrrole-2,5-dione, thiophene and carbazole was synthesized using Suzuki polymerization to generate P1. The solid thin film of P1 shows absorption band with maximum peaks at 374 and 548 nm, and the absorption onset at 679 nm, corresponding to band gap of 1.83 eV. The field-effect hole mobility of P1 is 2.2 × 10−5 cm2/Vs. The device based on the polymer:PCBM (1:2) blend without thermal treatment showed a VOC of 0.82 V, a JSC of 6.28 mA/cm2, and an FF of 0.39, giving a PCE of 2.00%. |
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| Keywords: | Polymer Photovoltaic cells Pyrrolo[3 2-b]pyrrole-2 5-dione |
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