Orientational Mechanism for Long-Chain Organic Molecules During Physical Vapor Deposition
Orientational Mechanism for Long-Chain Organic Molecules During Physical Vapor Deposition
复制标题
物理气相沉积过程中长链有机分子的取向机制
DOI：
10.1080/713738579
复制
发表时间：
2002
影响因子：
0.7
通讯作者：
R. Akiyama
中科院分区：
文献类型：
--
作者：
A. Kubono;R. Akiyama
基于各向异性晶体生长初始阶段的简单模型解释了各种线性长链化合物物理气相沉积过程中的分子取向。在该模型中，初始阶段涉及蒸气吸附、表面迁移、从基底重新蒸发、捕获到簇中、从簇中重新蒸发以及重新取向，其中考虑了分子的各向异性。此外，假设初始小核的两个基本取向处于热平衡状态。各个基本过程的微分方程组可以通过数值求解。计算结果与长链分子在不同基底温度下的实际取向现象非常吻合，即基底温度越高，法向取向程度越高。
Molecular orientations during physical vapor deposition of various linear long-chain compounds are interpreted on the basis of a simple model for the initial stage of anisotropic crystal growth. In this model, the initial stage involves adsorption from vapor, surface migration, re-evaporation from the substrate, capture into a cluster, re-evaporation from a cluster, and re-orientation, where the anisotropy of the molecules are considered. In addition, two fundamental orientations of initial small nuclei are assumed to be under thermal equilibrium. The set of differential equations for the individual elementary processes can be solved numerically. The calculated results agree well with actual orientational phenomena of long-chain molecules at various substrate temperatures, i.e., a higher substrate temperature results in a higher degree of normal orientation.