权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Study on transport mechanism of carriers that go across the contact interface in insulating composite

绝缘复合材料中载流子穿过接触界面的输运机理研究

基本信息

批准号：
08650395
负责人：
KAWAMOTO Akira
金额：
$ 0.83万
依托单位：
Fukui national College of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1997
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08650395/
关键词：
contact potential electronic level work function morphology kelvin method interface surface state insulating polymer イオン化ポテンシャル光キャリア注入電流大気中での紫外線分光 XPS エネルギーギャップ

项目摘要

The more electrical and electronic apparatus and other equipment using insulating composites are nimiaturized, the more strong electric fields apply their insulating layr. The charge-exchange rate at the insulator-insulator interface in insulating composites is affected by the direction of carrier transport and carrier species. Such asymmetric characteristics are widely seen in insulating composites e. g. RE-EVA and epoxy-alumina and seem very important to understand the insulation performance of composites. In order to clarify the asymmetric properties on the basis of electronic levels, such as Fermi level, ionization potential, electron affinity and effective electron or hole conduction levels, the methods for estimating electronic levels in ploymers were discussed. In this paper, electronic levels in insulating polymers were estimated by contact potential defference XPS,UPS in air and photoinjection current and the correlation among the estimated levels was investigated.Ionization p … More otential (Poly-2-Vinyl Pyridine-Co-Stirene), PMMA (polymethyl-methacrylate), PS (polystirene) snd PVK (Poly-N-Vinyl-carbazole) were estimated by adding the work function measured by Kelvin method and binding energy estimated from the XPS spectrum. In PVK,the electronic level estimated by photoinjection current method was consistent with that by Kelvin method and XPS.However, In PS and PMMA,the electronic level estimated by that did not coincide with the upper edge of valence band estimated from Kelvin method and XPS and corresponded to effective donor level which contribute to hole conduction. The UPS measurement in air seemed to be able to observe tail of electronic levels near Fermi level which were responsible for contact electrification.The electronic states on polymer surface were easily changed by adsorption of water or other molecules, change in morphology and so on. On the other hand, the contact potential difference between polymers and reference materials (Au or ITO) decteases with UV treatment for polymers. This shows that Kelvin method is highly sensitive to observe the change of the electronic states on polymer surface with heat and UV treatment which might be related to degradation of polymers by heat or UV.It seems that this investigation contributed to the establishment of the methods for estimating electronic levels in insulating polymers. Less

使用绝缘复合材料的电气和电子设备及其他设备越智能化，施加在其绝缘层上的电场就越强。绝缘复合材料中绝缘体-绝缘体界面的电荷交换速率受载流子输运方向和载流子种类的影响。这种不对称特性在绝缘复合材料中广泛存在。G. RE-EVA和环氧-氧化铝的复合材料的绝缘性能，似乎是非常重要的了解。为了从费米能级、电离势、电子亲合势、有效电子或空穴导电能级等电子能级的角度阐明聚合物的非对称性，讨论了聚合物电子能级的估算方法。本文用接触电位差XPS、空气中UPS和光注入电流估算了绝缘聚合物中的电子能级，并研究了估算能级之间的相关性。 ...更多信息用Kelvin法测量了聚乙烯基吡啶（PVK）、聚甲基丙烯酸甲酯（PMMA）、聚苯乙烯（PS）和聚乙烯基咔唑（PVK）的功函数，并结合XPS谱估算了它们的结合能。在PVK中，光注入电流法估算的电子能级与Kelvin法和XPS估算的电子能级一致，而在PS和PMMA中，光注入电流法估算的电子能级与Kelvin法和XPS估算的价带上沿不一致，而是对应于空穴导电的有效施主能级。在空气中的UPS测量似乎可以观察到费米能级附近的电子态拖尾，这些电子态拖尾是导致接触带电的原因;聚合物表面的电子态很容易因水或其他分子的吸附、形貌的改变等而改变;另一方面，聚合物与参比材料（Au或ITO）之间的接触电位差随着聚合物的UV处理而减小。这表明，开尔文方法是高度敏感的观察的电子状态的变化，在聚合物表面的热和紫外线处理，这可能与聚合物的降解热或紫外线。看来，这项调查有助于建立估计的方法在绝缘聚合物中的电子能级。少