Ionization-Assisted Deposition of Large Molecular Weight Organic Materials and its Mass Analysis

大分子量有机材料的电离辅助沉积及其质量分析

基本信息

批准号：
07650358
负责人：
USUI Hiroaki
金额：
$ 1.6万
依托单位：
Tokyo University of Agriculture and Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

项目摘要

A new technique of depositing high-quality thin films of large-molecular weight organic materials is required for the development of functional organic thin film devices. A dry process, that forms thin films in the clean environment of vacuum, is especially favorable for the future development of micro devices. However, it has been difficult by the conventional vacuum evaporation technique to produce thin films of organic materials that have high molecular weight. This project aims to solve this problem by developing a new process technique, ionization-assisted deposition. The emphasis is to study the high molecular weight organic thin films from the standpoint of process technology. Its strategy is largely classified in two categories ; 1. Direct deposition of organic molecules, and 2. Film formation that accompanies polymerization process in the course of deposition. The latter category is subdivided into two methods according to the type of polymerization reaction ; stepwise reactio … More n and chain reaction.In the first sategory, we have deposited several monomer materials, including perylenetetracarboxylicdianhidride and 8-hydroxyquinoline aluminum. It has been found that the ionization-assisted deposition method was effective in controlling the semiconducting and light emitting properties of these materials. The technique can be applied for the development of thin film devices such as organic light-emitting diode. As a polymeric material, direct deposition of polytetrafluoroethylene was deposited by the ionization-assisted method. Thin polymeric films that have controlled molecular orientation and improved electrical insulation capability were obtained.In the second category, monomer source materials were evaporated to form polymeric thin film by the reaction on the substrate surface. Polyurea thin films were obtained by stepwise reaction of two codeposited monomers ; diisocyanate and dipiperidine. It was found that the ionization-assisted deposition can control the dipole orientation during the film formation by means of the bias voltage on the substrate and the ionic charge accumulated on the film surface. As a consequence, the as-deposited films showed optical nonlinearity and electro-optic effect without additional poling process. Some vinyl compounds were polymerized by chain reaction on the substrate surface. Although the simple evaporation technique does not yield polymeric films, the ionization-assisted deposition can excite the molecules during the deposition and can control the polymerization reaction by the ion current and ion acceleration voltage. Mass analysis of the deposition beam showed that the polymerizable molecules easily form fragments upon the ionization process. Less

功能性有机薄膜器件的开发需要一种沉积高质量大分子量有机材料薄膜的新技术，在清洁的真空环境中形成薄膜的干法工艺对未来尤其有利。然而，传统的真空蒸发技术很难生产高分子量的有机材料薄膜，该项目旨在通过开发一种新的工艺技术——电离辅助沉积来解决这个问题。主要研究高分子有机物从工艺技术的角度来看，其策略主要分为两类；1.有机分子的直接沉积，以及2.沉积过程中伴随聚合过程的成膜方法。在第一类中，我们沉积了几种单体材料，包括苝四羧酸二酐和8-羟基喹啉铝。已发现电离辅助沉积方法可有效控制这些材料的半导体和发光性能，该技术可应用于有机发光二极管等薄膜器件的开发。通过电离辅助方法直接沉积聚四氟乙烯，获得了具有控制分子取向和改善电绝缘能力的聚合物薄膜。在第二类中，蒸发单体源材料以形成聚合物薄膜。通过两种二异氰酸酯和二哌啶的共沉积反应在基底表面上进行反应，得到了聚脲薄膜；发现电离辅助沉积可以通过施加偏压来控制成膜过程中的偶极子取向。结果，沉积薄膜表现出光学非线性和电光效应，无需额外的极化过程即可通过链式反应聚合。虽然简单的蒸发技术不能产生聚合物薄膜，但电离辅助沉积可以在沉积过程中激发分子，并可以通过沉积束的离子电流和离子加速电压来控制聚合反应。可聚合分子在电离过程中很容易形成碎片。