石墨烯/铁电异质结构纵向器件性能研究

项目名称： 石墨烯/铁电异质结构纵向器件性能研究

项目编号： No.61474072

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 无线电电子学、电信技术

项目作者： 吴华强

作者单位： 清华大学

项目金额： 84万元

中文摘要： 石墨烯由于其优异的电学性能、机械性能、光学性能、热学性能等成为当前的国际研究热点，然而由于完整的石墨烯没有带隙，在模拟电路上不饱和，因而其开关比很低，极大地限制了它在数据逻辑电路的应用。石墨烯纵向结构由于其具有较大的开关比 ，而受到广大研究人员的极大关注。然而，该势垒的有效高度调控也比较有限。另外，石墨烯纵向器件的制备在目前阶段还难以用于大规模应用，同时器件的重复性难以保证。为此，本项目提出一种石墨烯/铁电纵向的制备方案，用铁电的两个极化方向来二次调控开关比ON/OFF，发展了新的原理来实现石墨烯纵向器件更大开关比的调控，同时其具有易于加工的优点，有大规模应用的潜力。另外，本项目还提出一套有效的石墨烯/铁电纵向器件机理模拟程序。对石墨烯/铁电结构纵向结构中隧穿输运进行有效的模拟仿真，为器件的制备提供方向性。

中文关键词： 石墨烯；量子输运；低维结构；异质结构；半导体纳米结构

英文摘要： The extremely electrical properties, mechanical properties, optical properties,thermal properties make graphene a promising material in a wide range of applications.An obstacle to the use of graphene as an alternative to silicon electronics has been the absence of an energy gap between its conduction and valence bands, which makes it difficult to achieve low power dissipation in the OFF state.These low ratios are sufficient for individual analog electronics.The vertical graphene devices are made great attention due to large ON/OFF ratio. However, the effective regulation of the barrier height is relatively limited.In addition, the preparation vertical graphene device at this stage is hard for large-scale applications, and the device is also difficult to ensure reproducibility. In order to solve this question, we propose a new prepared method of vertical graphene/ferroelectric devices, with two directions of the ferroelectric polarization switching to modulate the ON/OFF ratio, and the development of new principles to achieve much larger ON/OFF ratio, while having the advantage of easy processing, large-scale potential application. In addition, We also proposes an effective graphene/ferroelectric devices simulation mechanism program. The simulation model of the vertical graphene/ferroelectric structure will provide direction for the prepared of the devices.

英文关键词： Graphene;Quantumn transoport;Low dimensional structure;Heterostructure;Semiconductor nanostructures