Raman scattering study on organic semiconductors having gigantic dielectric constant

大介电常数有机半导体的拉曼散射研究

• 批准号: 01550007
• 负责人: IWASA Yoshihiro
• 金额: $ 1.54万
• 依托单位: Department of Applied Physics, University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1989
• 资助国家: 日本
• 起止时间: 1989 至 1990
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-01550007/
• 关键词: organic charge transfer compounds; gigantic dielectric constant; current switching effect; spin-Peierls phase; charge soliton dynamics; Raman scattering; infrared spectroscopy; 1次元性; 格子転移; 分子エレクトロニクス; 巨大誘電応答; ソリトンダイナミクス

Mixed stack organic semiconductors, composed of oneーdimensional chains of alternately stacked donor and acceptor molecules have an instability to molecular valence change. These materials show anomalous response to the electric field. One is a gigantic dielectric response and the other is a current switching effect. Especially, the latter has been attracted much attention in this decade due to possible application to molecular electronics. We have investigated the transport, dielectric, and optical properties of these materials. Raman and infrared spectra were measured to investigate the microscopic properties of the switch-on state.From the experimental results, we have concluded that the stacking fault on the one-dimensional chain (in other words, solitons) play important roles in the dynamical properties of these compounds. The ionic charge transfer compounds undergo a structural phase transition. The switching effect was found to occur conspicuously in the low temperature phase, where neighboring molecules are dimerized. It was found that this dimerization order is partially broken by too much current mediated by solitonic charge carriers.

混合叠层有机半导体是由施主和受主分子交替叠层而成的一维链状结构，具有对分子价态变化的不稳定性。这些材料对电场表现出反常的响应。一个是巨大的介电响应，另一个是电流开关效应。特别是后者，由于其在分子电子学中的潜在应用，在近十年来引起了人们的广泛关注。我们研究了这些材料的传输，介电和光学性质。通过拉曼光谱和红外光谱研究了这些化合物开启态的微观性质，并从实验结果中得出结论：一维链上的层错（即孤子）对这些化合物的动力学性质起着重要的作用。离子电荷转移化合物经历结构相变。开关效应被发现发生显着的低温相，其中相邻的分子二聚化。有人发现，这种二聚秩序是部分打破了太多的电流介导的孤子电荷载流子。

项目成果

岩佐 義宏 国府 隆夫: ""有機電荷移動錯体におけるソリトン・ダイナミクス"" 固体物理.

Yoshihiro Iwasa 和 Takao Kokufu：“有机电荷转移复合物中的孤子动力学”固体物理学。

国府田 隆夫,岩佐 義宏: ""有機錯体結晶の相転移と非線形伝導"" 応用物理.

Takao Kouda、Yoshihiro Iwasa：“有机复合晶体中的相变和非线性传导”应用物理学。

Y.Iwasa,I.Soga,T.Koda,Y.Tokura,and G.Saito.: "“Neutralーionic transition in TTFーchloranil and TMBーTCNQ."" Synth.Metals.

Y.Iwasa、I.Soga、T.Koda、Y.Tokura 和 G.Saito.：““TTF-四氯苯醌和 TMB-TCNQ 中的中性离子转变。”Synth.Metals。

H.Okamoto et al.: "Anomalous Dielectric response of a mixed-stack Charge Transfer Crystal:Tetrathiafulvalene-p-chloranil." to be published in Physical Review B.(1990)

H.Okamoto 等人：“混合堆电荷转移晶体的异常介电响应：四硫富瓦烯-对四氯苯醌”。

Y.Iwasa, N.Watanabe, T.Koda, S.Koshihara, Y.Tokura, N.Iwasawa,and G.Saito.: "the Physics and Chemistry of Organic Superconductors" Springer Verlag Berlin,Heidelberg, 476 (1990)

Y.Iwasa、N.Watanabe、T.Koda、S.Koshihara、Y.Tokura、N.Iwasawa 和 G.Saito.：“有机超导体的物理和化学” Springer Verlag Berlin，海德堡，476 (1990)