College of Electronic Science and Engineering, Nanjing University of Posts and Telecommunications, Nanjing 210046, China.
Key Laboratory of Radio Frequency and Micro-Nano Electronics of Jiangsu Province, Nanjing 210023, Jiangsu, China.
Sci Rep. 2017 Apr 6;7:43922. doi: 10.1038/srep43922.
Motivated by the fabrication of layered two-dimensional material CN-h2D [Nat. Commun. 6, 6486 (2015)], we cut the single-layer CN-h2D into a zigzag nanoribbon and perform a theoretical study. The results indicate that the band structure changes from semiconducting to metallic and a negative differential resistance effect occurs in the I-V curve. Interestingly, the current can be reduced to zero and this insulator-like state can be maintained as the bias increases. We find this unique property is originated from a peculiar band morphology, with only two subbands appearing around the Fermi level while others being far away. Furthermore the width and symmetry of the zigzag CN-h2D nanoribbon can be used to tune the transport properties, such as cut-off bias and the maximum current. We also explore the electron transport property of an aperiodic model composed of two nanoribbons with different widths and obtain the same conclusion. This mechanism can be extended to other systems, e.g., hybrid BCN nanoribbons. Our discoveries suggest that the zigzag CN-h2D nanoribbon has great potential in nanoelectronics applications.
受制备层状二维材料 CN-h2D 的启发[Nat. Commun. 6, 6486 (2015)]，我们将单层 CN-h2D 切割成锯齿形纳米带，并进行了理论研究。结果表明，能带结构从半导体变为金属，并且在 I-V 曲线上出现负微分电阻效应。有趣的是，电流可以减小到零，并且这种绝缘状态可以随着偏置的增加而保持。我们发现这种独特的性质源自于一种特殊的能带形态，只有两个子带出现在费米能级附近，而其他子带则远离费米能级。此外，锯齿形 CN-h2D 纳米带的宽度和对称性可以用于调节输运性质，例如截止偏压和最大电流。我们还研究了由两个具有不同宽度的纳米带组成的非周期性模型的电子输运性质，得到了相同的结论。这种机制可以扩展到其他系统，例如，杂交 BCN 纳米带。我们的发现表明，锯齿形 CN-h2D 纳米带在纳米电子学应用中有很大的潜力。
