Dispersion control of Ag nanoparticles in bulk-heterojunction for efficient organic photovoltaic devices |
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| Affiliation: | 1. Department of Chemical and Biomolecular Engineering (BK+ Graduate Program), Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, Republic of Korea;2. Global Technology Center, Samsung Electronics Co., Ltd., 129 Samsung-ro, Yeongtong-gu, Suwon-si, Gyeonggi-do 443-742, Republic of Korea;3. School of Integrative Engineering, Chung-Ang University, 84 Heukseok-Ro, Dongjak-gu, Seoul 156-756, Republic of Korea;1. Global Technology Center, Samsung Electronics Co., Ltd., Suwon, Gyeonggi-do 443-742, Republic of Korea;2. Light Metal Division, Korea Institute of Materials Science, 797 Changwondaero, Seongsan-gu, Changwon, Gyeongnam 642-831, Republic of Korea;3. IFW Dresden, Institute for Complex Materials, P.O. Box 27 01 16, D-01171 Dresden, Germany;4. TU Dresden, Institute of Materials Science, D-01062 Dresden, Germany;5. Center for Non-crystalline Materials, Department of Materials Science and Engineering, Yonsei University, 134 Shinchon-dong, Seodaemun-gu, Seoul 120-749, Republic of Korea;1. Department of Applied Physics, Kyung Hee University, Gyeonggi-do 17104, Republic of Korea;2. Display Materials & Components Research Center, Korea Electronics Technology Institute, Gyeonggi-do 13509, Republic of Korea;1. Photovoltaic and Optoelectronic Devices Group, Departament de Física, Universitat Jaume I, ES-12071 Castelló, Spain;2. EMAT, University of Antwerp, Antwerp, Belgium;3. Genes’Ink, 24 Avenue Gaston Imbert, 13790 Rousset, France;4. Department of Chemistry, Faculty of Science, King Abdulaziz University, Jeddah 21589, Saudi Arabia |
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| Abstract: | This research focuses on the effect of different capping agents on Ag nanoparticles (NPs), for the improved efficiency of organic photovoltaic cells. Ag NPs were produced by solution chemistry of the polyol process, and then successfully capped with oleylamine (OA), polyvinylpyrrolidone (PVP), or thiol terminated polystyrene (PS-SH), as proven by FT-IR spectra. These Ag NPs with different capping agents were finally embedded in the photoactive layer of poly(3-hexylthiophene):6,6-phenyl-C61 butyric acid methyl ester (P3HT:PCBM) bulk heterojunction solar cells. Because of the presence of a suitable capping agent that prevents aggregation, the dispersity of the Ag NPs in organic solvent was significantly improved, in the sequence of OA, PVP, and PS-SH. The photovoltaic cells exhibit increased performance from 3.11% to 3.49%, at an optimized blend ratio of Ag NPs (2.5 wt%) capped with PS-SH. This enhancement is mainly attributed to the improved short circuit current (increased from 8.49 mA/cm2 to 9.29 mA/cm2) and extinction with effective light scattering, caused by improved dispersion of the Ag NPs in BHJ films, through reducing unwanted particle aggregation. |
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| Keywords: | Bulk-heterojunction Ag nanoparticles Capping agent Organic photovoltaic devices Extinction Dispersion control |
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