| Electronic confinement in quasi—one—dimensional triblock copolymers |
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| 引用本文： | 刘德胜,王鹿霞,解士杰,韩圣浩,梅良模.Electronic confinement in quasi—one—dimensional triblock copolymers[J].中国物理 B,2003,12(5):548-552. |
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| 作者姓名： | 刘德胜 王鹿霞 解士杰 韩圣浩 梅良模 |
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| 作者单位： | (1)School of Physics and Microelectronics, Shandong University, Jinan 250100, China; (2)School of Physics and Microelectronics, Shandong University, Jinan 250100, China; Department of Physics, Jining Normal University, Jining 272025, China; State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China; (3)School of Physics and Microelectronics, Shandong University, Jinan 250100, China; State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China |
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| 基金项目： | Project supported by the Major Program of the National Natural Science Foundation of China (Grant No 90103034), and the National Natural Science Foundation of China (Grant Nos 10074040 and 60176021). |
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| 摘 要： | A tight-binding calculation to describe the triblock copolymer xPA(polyacetylene)/nPPP (poly(p-phenylene))/yPA or xPPP/nPA/yPPP is presented. The interfacial coupling between homopolymer segments is attributed to the hopping of π-electrons and the coupling of σ-bonds. The dependence of the band gap of triblock copolymers on the interfacial couplings or on the composite segment lengths is studied. The influence of composite segment lengths on the electron density is also studied. For nPPP/xPA/nPPP structures, the band gap varies with PA segment length over a wide range of 1.32－2.74eV. For nPA/xPPP/nPA structures,the band gap is invariant with PPP segment length. It is found that a spontaneous tunnelling phenomenon could take place in nPA/xPPP/nPA structures. Furthermore, the polaron caused by doping an electron into nPA/xPPP/nPA will tend to be confined in one of the well (PA) parts. This kind of confinement may increase the electron－hole recombination probability.
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| 关 键 词： | 有机量子阱 电子约束 共聚物 超晶格 异质结构 |
| 收稿时间： | 2002-11-29 |
Electronic confinement in quasi-one-dimensional triblock copolymers |
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| Liu De-Sheng,Wang Lu-Xi,Xie Shi-Jie,Han Sheng-Hao and Mei Liang-Mo.Electronic confinement in quasi-one-dimensional triblock copolymers[J].Chinese Physics B,2003,12(5):548-552. |
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| Authors: | Liu De-Sheng Wang Lu-Xi Xie Shi-Jie Han Sheng-Hao and Mei Liang-Mo |
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| Institution: | School of Physics and Microelectronics, Shandong University, Jinan 250100, China; Department of Physics, Jining Normal University, Jining 272025, China; State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China |
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| Abstract: | A tight-binding calculation to describe the triblock copolymer xPA(polyacetylene)/nPPP (poly(p-phenylene))/yPA or xPPP/nPA/yPPP is presented. The interfacial coupling between homopolymer segments is attributed to the hopping of π-electrons and the coupling of σ-bonds. The dependence of the band gap of triblock copolymers on the interfacial couplings or on the composite segment lengths is studied. The influence of composite segment lengths on the electron density is also studied. For nPPP/xPA/nPPP structures, the band gap varies with PA segment length over a wide range of 1.32－2.74eV. For nPA/xPPP/nPA structures,the band gap is invariant with PPP segment length. It is found that a spontaneous tunnelling phenomenon could take place in nPA/xPPP/nPA structures. Furthermore, the polaron caused by doping an electron into nPA/xPPP/nPA will tend to be confined in one of the well (PA) parts. This kind of confinement may increase the electron－hole recombination probability. |
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| Keywords: | organic quantum well copolymer electronic confinement |
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