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首页> 外文期刊>Journal of Computational Electronics >Graphene nanoribbon photodetectors based on an asymmetric potential barrier: a new concept and a new structure
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Graphene nanoribbon photodetectors based on an asymmetric potential barrier: a new concept and a new structure

机译：基于不对称势垒的石墨烯纳米带光电探测器：新概念和新结构

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摘要

In the last decade, graphene photodetectors have been introduced and investigated in many works. In any photodetector, the separation of the photo-excited electrons and holes is one of the most basic mechanisms. However, a few distinct methods have already been introduced for the separation and all of them are based on the usage of a longitudinal electric field. In this paper, a new method is proposed. Our method is based on applying a vertical electric field which induces an asymmetric potential barrier in front of one or both of the photo-excited carriers. First, a simple one-dimensional toy model consisting of a one-dimensional atomic chain is used to focus on the concept. Many aspects, including the effects of the potential barrier location, its height, and its width, are investigated by this model. Then, in order to extend to real applications, a new structure is introduced in this paper; it is based on graphene nanoribbons and an asymmetric metal gate. Our results show that this structure results in appropriate carrier separation. The nonequilibrium Green function method with a tight-binding model is employed for the simulation of the proposed devices, and the results are shown in the paper.
机译：在过去的十年中，石墨烯光电探测器已被引入并进行了许多研究。在任何光电探测器中，光激发电子和空穴的分离是最基本的机制之一。但是，已经引入了几种不同的分离方法，所有这些方法都是基于纵向电场的使用。本文提出了一种新的方法。我们的方法基于施加垂直电场，该电场在一个或两个光激发载流子的前面感应出不对称的势垒。首先，一个简单的由一维原子链组成的一维玩具模型被用来关注这一概念。此模型研究了许多方面，包括势垒位置，其高度和宽度的影响。然后，为了扩展到实际应用，本文介绍了一种新的结构。它基于石墨烯纳米带和不对称金属栅极。我们的结果表明，这种结构导致适当的载流子分离。采用带有紧约束模型的非平衡格林函数方法对所提出的器件进行仿真，结果显示在本文中。

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