Optical spectra and optical conductivities of iodine-doped polyacetylene |
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| Affiliation: | 1. Computer Science and Communication Research Centre (CIIC), School of Technology and Management, Polytechnic of Leiria; Leiria, Portugal;2. School of Technology and Management, Polytechnic of Leiria; Leiria, Portugal;3. INESC TEC, CRACS, Porto, Portugal;1. Academy of Forest Inventory and Planning, Southwest Forestry University, Kunming 650224, China;2. College of Forestry, Fujian Agriculture and Forestry University, Fuzhou 350002, China;3. National Centre for Borderland Ethnic Studies in Southwest China, Yunnan University, Kunming 650091, China;4. School of Ethnology and Sociology, Yunnan University, Kunming, 650091, China |
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| Abstract: | Reflection spectra of iodine-doped polyacetylene are studied for the wavenumber range 20–40 000 cm−1 in order to find changes occurring in the electronic structure of the polymer upon doping. Three stages of doping are recognized from a spectral analysis of (CHIy)x : (1) 0 < y < 0.10, where the charged soliton domain is the dominant product; (2) 0.10 < y < 0.18, the free carrier is found where the hole and the unpaired electron are formed simultaneously; (3) 0.19 < y < 0.25, the free carriers begin to overlap each other and metallic properties become more evident. A new type of electronic transition associated with the electron transfer (charge resonance) between the hole states is found strongly in the far-infrared region. The origin of the metallic properties is discussed from a structural viewpoint. |
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