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

Clarification of Interfacial Levels of Insulating Polymeric Composite and Establishment of Its Control Method

绝缘高分子复合材料界面层的澄清及其控制方法的建立

基本信息

批准号：
05650320
负责人：
KAWAMOTO Akira
金额：
$ 0.83万
依托单位：
Fkui National College of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1993
资助国家：
日本
起止时间：
1993 至 1994
项目状态：
已结题

项目摘要

As the charge-exchange rate at the insulator-insulato interface in insulating composetes is affected by the direction of the carrier transport and carrier species, but these have not yet been fully understood. Photocurrens on a PS (polystirene)-PMMA (polmethyl-methacrylate) twolayr composite were measured in order to clarify the carrier injection and the charge-exchange processes at the interface. It was found that electrons from the PMMA can pass the interface more easily than holes from the PMMA layr and holes from the PS layr can pass the interface more easily than electrons from the PS layr. These suggest that charge-exchange process can be explained by the Molecular Ion States Model. On the other hand, PS/PMMA contact charging experiments suggested that the donor and acceptor levels contribute to both contact charging and electronic charge transport at the interface.Photoinjection currents in PS and PMMA were measured in order to clarify the correlation of conduction levels in polymers with the charge-exchange processes at the interface. The analysis of the optical absorption spectra PS and the photoinjection of holes from the metal into the PS gave the contact barrier height (Au-PS-Au), donor level for hole transport and acceptor level for electron transport as 1.98 eV,and 2.4 eV respectively. These results of conduction levels coincided well with the results of the contact charge-exchange experiments between various metals and PS.On the other hand, a detailed study of the photoinjention of electrons into the PMMA determined the contact barrier height (Al-PMMA-Al), donor and acceptor levels for carrier transport as 0.29 eV,5.08 eV and 3.20 ev respectively. These results did not coincide well with the results of the contact charge-exchange experiments.These suggest that the anisotropy of electronic charge transoprt at the intrface in PS-PMMA composite can be explained by the donor and acceptor levels contributing to carrier transport in PS and PMMA.

由于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，但这些影响还没有完全被理解。测量了PS(聚苯乙烯)-PMMA(聚甲基丙烯酸甲酯)双层复合材料上的光电流，以阐明界面上的载流子注入和电荷交换过程。发现来自PMMA层的电子比来自PMMA层的空穴更容易通过界面，来自PS层的空穴比来自PS层的电子更容易通过界面。这表明电荷交换过程可以用分子离子状态模型来解释。另一方面，PS/PMMA接触电荷实验表明，施主和受主能级对界面上的接触电荷和电子电荷传输都有贡献。为了阐明聚合物中电导能级与界面电荷交换过程之间的关系，测量了PS和PMMA中的光注入电流。光吸收光谱PS和光注入金属空穴的分析结果表明，接触势垒高度(Au-PS-Au)为1.98 eV，空穴传输的施主能级为2.4 eV，电子传输的受主能级为2.4 eV。这些电导能级的结果与不同金属与PS之间的接触电荷交换实验结果很好地吻合。另一方面，对电子注入PMMA的详细研究确定了载流子传输的接触势垒高度(Al-PMMA-Al)、施主能级和受主能级分别为0.29 eV、5.08 eV和3.20 eV。这些结果与接触电荷交换实验的结果并不一致，这表明PS-PMMA复合材料界面电子电荷传输的各向异性可以用PS和PMMA中对载流子传输起作用的施主和受主能级来解释。