碳纳米管薄膜场致发射二极管：基于多物理场模型的系统响应研究
Carbon Nanotube Thin Film Field Emitting Diode: Understanding the System Response Based on Multiphysics Modeling
摘要：
在本文中，我们模拟的演变和自组装的随机取向的碳纳米管（CNTs），生长在金属衬底上的薄膜的形式，在二极管配置下的场发射。尽管有高输出，这种薄膜器件中的电流经常急剧衰减。本文的重点是理解这个问题。提出了一种系统的、基于多物理场的建模方法。首先，一个成核耦合模型的CNT薄膜的降解推导出，其中的CNT被假定为通过破碎和形成簇衰变。碳纳米管的随机取向和机电相互作用，然后建模来解释自组装。碳纳米管的退化状态和机电力被用来更新的碳纳米管的取向。最后利用Fowler-Nordheim方程和在阳极侧的计算单元表面上的积分来获得器件尺度的场发射电流。模拟结果与实验结果吻合较好。基于开发的模型，数值模拟，旨在了解各种几何参数和它们的统计特性对设备的电流历史的影响。
英文摘要：
In this paper, we model the evolution and self-assembly of randomly oriented carbon nanotubes (CNTs), grown on a metallic substrate in the form of a thin film for field emission under diode configuration. Despite high output, the current in such a thin film device often decays drastically. The present paper is focused on understanding this problem. A systematic, multiphysics based modelling approach is proposed. First, a nucleation coupled model for degradation of the CNT thin film is derived, where the CNTs are assumed to decay by fragmentation and formation of clusters. The random orientation of the CNTs and the electromechanical interaction are then modeled to explain the self-assembly. The degraded state of the CNTs and the electromechanical force are employed to update the orientation of the CNTs. Field emission current at the device scale is finally obtained by using the Fowler-Nordheim equation and integration over the computational cell surfaces on the anode side. The simulated results are in close agreement with the experimental results. Based on the developed model, numerical simulations aimed at understanding the effects of various geometric parameters and their statistical features on the device current history are reported.
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