Two effects of 1,8-diiodooctane on PTB7-Th:PC71BM polymer solar cells |
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| Affiliation: | 1. Key Laboratory of Luminescence and Optical Information (Beijing Jiaotong University), Ministry of Education, Beijing, 100044, China;2. Institute of Optoelectronics Technology, Beijing Jiaotong University, Beijing, 100044, China;1. Dept. of Solar Energy and Environmental Physics, Swiss Institute for Dryland Environmental and Energy Research, The Jacob Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Midreshet Sede Boqer 8499000, Israel;2. C.H.O.S.E. – Center for Hybrid and Organic Solar Energy, Via G. Peroni 400/402, 00131 Rome, Italy;3. Dep. of Electronics Engineering, University of Rome Tor Vergata, Via del Politecnico 1, 00133 Rome, Italy;1. Key Laboratory of Luminescence and Optical Information, Ministry of Education, Beijing Jiaotong University, Beijing 100044, PR China;2. State Key Laboratory of Catalysis, Dalian institute of Chemical Physics, Chinese Academy of Sciences, Dalian National Laboratory for Clean Energy, 457 Zhongshan Road, Dalian 116023, PR China;1. Cavendish Laboratory, J.J. Thomson Avenue, Cambridge CB3 0HE, United Kingdom;2. Centre for Advanced Materials, Universität Heidelberg, Heidelberg 69120, Germany;3. Kirchhoff-Institut für Physik, Universität Heidelberg, Heidelberg 69120, Germany;1. Department of Functional Materials Science, Saitama University, Saitama, 338-8570, Japan;2. Department of Materials Science and Engineering, Iwate University, Morioka, 020-8551, Japan |
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| Abstract: | To obtain higher device performance, the ideal bulk heterojunction (BHJ) morphology should feature both nanophase separation to increase charge generation and bi-continuous percolating networks to increase charge transport. In this paper, solvent additive, 1,8-diiodooctane (DIO), was used in PTB7-Th:PC71BM blend to improve BHJ morphology. The effect of DIO on charge generation and charge transport were studied carefully. Experimental study indicated that the effect of DIO on charge generation and charge transport are conflicted. Positive effects of DIO, which were induced by nanophase separation for charge generation in BHJ, are proved by the results of internal quantum efficiency (IQE) and photocurrent density (Jph), and negative effects of DIO on charge transport has been investigated according to the time-of-flight secondary ion mass spectrometer (TOF-SIMS). |
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| Keywords: | Polymer solar cell 1 8-diiodooctane Charge generation Charge transport |
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