Two new D–A conjugated polymers P(PTQD-Th) and P(PTQD-2Th) with same 9-(2-octyldodecyl)-8H-pyrrolo[3,4-b]bisthieno[2,3-f:3′,2′-h]quinoxaline-8,10(9H)-dione acceptor and different donor units for BHJ polymer solar cells application |
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| Affiliation: | 1. A.N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Vavilova str., 28, Moscow 119991, Russia;2. Department of Photonics, National Chiao Tung University, 1001 University Road, Hsinchu, Taipei 30010, Taiwan;3. R&D Center for Engineering and Science, JEC Group of Colleges, Jaipur Engineering College, Kukas, Jaipur 303101, India;1. Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA;2. Department of Chemical & Biological Engineering, Hanbat National University, Daejeon 305-719, Republic of Korea;3. Department of Materials Science and Engineering, Jungwon University, Goesan 367-805, Republic of Korea;4. School of Mechanical Engineering, Konkuk University, Seoul 143-701, Republic of Korea;5. Department of Organic and Nano System Engineering, Konkuk University, Seoul 143-701, Republic of Korea;1. Graduate Institute of Photonics and Optoelectronics and Department of Electrical Engineering, National Taiwan University, Taiwan;2. Department of Photonics Engineering, Yuan Ze University, Taiwan;3. Department of Electro-Optical Engineering, National United University, No. 1, Lienda, Kung-Ching Li, Miaoli 36003, Taiwan;1. Center for Nano-Photonics Convergence Technology, Korea Institute of Industrial Technology, 500-480 Gwangju, Republic of Korea;2. Division of Microelectronic and Display Technology, Wonkwang University, Iksan, Jeollabukdo 500-749, Republic of Korea |
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| Abstract: | We report the synthesis, characterization and photovoltaic properties of bulk heterojunction polymer solar cells of new donor–acceptor conjugated copolymers P(PTQD-Th) and P(PTQD-2Th) that incorporate same strong 9-(2-octyldodecyl)-8H-pyrrolo3,4-b]bisthieno2,3-f:3′,2′-h]quinoxaline-8,10(9H)-dione as strong acceptor and different weak thiophene (Th) and bi-thiophene (2Th) as donors, respectively. Both the copolymers showed suitable unoccupied lowest molecular orbital (LUMO) energy levels, compatible with the LUMO of PC71BM for efficient electron transfer from copolymer to PC71BM in the blended copolymer: PC71BM thin films. Moreover the deeper highest occupied molecular orbital (HOMO) energy levels of both copolymers ensures the high open circuit voltage (Voc) of the BHJ polymer solar cells. The optimized P(PTQD-Th):PC71BM and P(PTQD-2Th):PC71BM with weight ratio of 1:2 processed with chloroform solvent showed PCE of 3.65% and 3.96%, respectively. The higher value of Jsc for the device processed with P(PTQD-2Th):PC71BM as compared to that for P(PTQD-Th):PC71BM, attributed to narrower optical bandgap and broader absorption profile for P(PTQD-2Th) as compared to P(PTQD-Th). The PCE values of polymer solar cells were further improved (5.54% and 5.67% for P(PTQD-Th):PC71BM and P(PTQD-2Th):PC71BM, respectively) when small amounts of solvent additive, i.e. 1,8-diiodoctane (DIO) were used for the processing of active layers. The improved PCE has been attributed to both the enhanced values of short circuit current (Jsc) and fill factor (FF) due to the better nanomorphology and charge transport, induced by the high boiling point of solvent additive. |
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| Keywords: | Strong acceptor–weak donor D–A copolymer Bulk heterojunction Polymer solar cells Solvent additive Power conversion efficiency |
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