Wang Xudong, Chen Yan, Wu Guangjian, Wang Jianlu, Tian Bobo, Sun Shuo, Shen Hong, Lin Tie, Hu Weida, Kang Tingting, Tang Minghua, Xiao Yongguang, Sun Jinglan, Meng Xiangjian, Chu Junhao
Hunan Provincial Key Laboratory of Key Film Materials & Application for Equipments, School of Material Sciences and Engineering, Xiangtan University, Xiangtan, 411105, Hunan, People's Republic of China. State Key Laboratory of Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, 500Yu Tian Road, Shanghai 200083, People's Republic of China. Hunan Provincial Key Laboratory of Thin Film Materials and Devices, School of Material Sciences and Engineering, Xiangtan University, Xiangtan 411105, Hunan, People's Republic of China.
Nanotechnology. 2018 Apr 3;29(13):134002. doi: 10.1088/1361-6528/aaa852.
Graphene has received numerous attention for future nanoelectronics and optoelectronics. The Dirac point is a key parameter of graphene that provides information about its carrier properties. There are lots of methods to tune the Dirac point of graphene, such as chemical doping, impurities, defects, and disorder. In this study, we report a different approach to tune the Dirac point of graphene using a ferroelectric polarization field. The Dirac point can be adjusted to near the ferroelectric coercive voltage regardless its original position. We have ensured this phenomenon by temperature-dependent experiments, and analyzed its mechanism with the theory of impurity correlation in graphene. Additionally, with the modulation of ferroelectric polymer, the current on/off ratio and mobility of graphene transistor both have been improved. This work provides an effective method to tune the Dirac point of graphene, which can be readily used to configure functional devices such as p-n junctions and inverters.
石墨烯在未来的纳米电子学和光电子学领域受到了广泛关注。狄拉克点是石墨烯的一个关键参数，它提供了有关其载流子特性的信息。有许多方法可以调节石墨烯的狄拉克点，如化学掺杂、杂质、缺陷和无序。在本研究中，我们报告了一种利用铁电极化场调节石墨烯狄拉克点的不同方法。无论其原始位置如何，狄拉克点都可以被调节到接近铁电 coercive 电压的位置。我们通过温度相关实验证实了这一现象，并用石墨烯中的杂质关联理论分析了其机制。此外，通过铁电聚合物的调制，石墨烯晶体管的电流开/关比和迁移率都得到了提高。这项工作提供了一种调节石墨烯狄拉克点的有效方法，可方便地用于配置诸如 p-n 结和逆变器等功能器件。
