The electron transport properties of photo- and electron-beam-irradiated C60 films |
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| Institution: | 1. Materials Science Division, Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro, Tokyo 152-8550, Japan;2. Japan Science and Technology Agency, 4-1-8 Honmachi, Kawaguchi, Saikama 332-0012, Japan;3. Nanomaterials Laboratory, National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan;4. Technology Platform Research Center, SEIKO EPSON Corporation, 281 Fujimi, Nagano 399-0293, Japan;1. State Key Laboratory of Organic–Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China;2. Institute of Electronic Paper Displays, South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou 510631, China;1. Inter University Accelerator Centre, New Delhi 67, India;2. Amity University, Noida 201313, Uttar Pradesh, India;1. School of Material Science and Technology, Indian Institute of Technology (BHU), Varanasi 221005, India;2. Inter-University Accelerator Centre, PB-10502, New Delhi 110067, India;3. Institute of Physics, Sachivalaya Marg, Bhubaneswar 751 005, India;1. Faculdade de Física, Pontifícia Universidade Católica do Rio Grande do Sul, Av. Ipiranga 6681, 90619-900 Porto Alegre, Brazil;2. Instituto de Física, Universidade Federal do Rio Grande do Sul, Av Bento Gonçalves 9500, 91501-970 Porto Alegre, Brazil;3. Université de Namur, Rue de Bruxelles 61, 5000 Namur, Belgium;4. Materials Research, GSI Helmholtz Centre, Planckstr. 1, 64291 Darmstadt, Germany;5. Technische Universität Darmstadt, Alarich-Weiss-Straße2, 64287 Darmstadt, Germany;1. II. Physikalisches Institut, Universität Göttingen, 37077 Göttingen, Germany;2. Harz University of Applied Sciences, 38855 Wernigerode, Germany;3. Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany;4. Forschungszentrum Jülich, 52425 Jülich, Germany;5. Centre de Recherche sur les Ions, les Materiaux et la Photonique, CIMAP-CIRIL-Ganil, F-14070 Caen, France;6. Department of Physics & Astrophysics, Delhi University, New Delhi, Delhi 110007, India;7. Technische Universität Darmstadt, Alarich-Weiss-Straße2, 64287 Darmstadt, Germany |
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| Abstract: | The electron transport properties of photo- and electron-beam-induced C60 polymers, in which the former is a dumbbell-type two-dimensional (2D) polymer and the latter is a new polyhedral structured (peanut-shaped) carbon nanomaterial, have been investigated. Using a four-probe measurement, we found that the 2D photopolymer and the peanut-shaped polymer exhibit semiconducting and metallic characters in air at room temperature, respectively. In order to elucidate the origin of these electron transport properties, we have performed density-functional calculations of the dumbbell-shaped and peanut-shaped C120 dimers that can be regarded as a basic unit of each polymer. It was found that the HOMO consisting of π-electrons orbital, which is related to the electron transport property, has a node on the 2+2] cyclo-bond for the dumbbell-shaped dimer, while that the HOMO has no node on the cross-linkage and spreads over the peanut-shaped dimer. |
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