CAS Center for Excellence in Nanoscience, Beijing Key Laboratory of Micro-nano Energy and Sensor, Beijing Institute of Nanoenergy and Nanosystems , Chinese Academy of Sciences , Beijing 100083 , China.
School of Nanoscience and Technology , University of Chinese Academy of Sciences , Beijing 100049 , China.
ACS Appl Mater Interfaces. 2018 Mar 7;10(9):8110-8116. doi: 10.1021/acsami.7b17529. Epub 2018 Feb 26.
We report the piezotronic effect on the performance of humidity detection based on a back-to-back Schottky contacted monolayer MoS device. By introducing an upswept mechanical strain, the in-plane electrical polarization can be induced at the MoS/metal junction region. The polarization charges can modify the Schottky barrier height at the interface of MoS/metal junction, subsequently improving the sensitivity of the humidity sensing. An energy band diagram is proposed to explain the experiment phenomenon of the humidity sensor. This work provides a simple way to enhance the sensitivity of ultrathin two-dimensional-materials-based sensors by the piezotronic effect, which has great potential applications in electronic skin, human-computer interfacing, gas sensing, and environment monitoring.
我们报告了基于背靠背肖特基接触单层 MoS 器件的湿度检测的压电器件效应。通过引入上扫机械应变，可以在 MoS/金属结区域诱导面内电极化。极化电荷可以修改 MoS/金属结界面的肖特基势垒高度，从而提高湿度传感的灵敏度。提出了一个能带图来解释湿度传感器的实验现象。这项工作通过压电器件效应提供了一种增强基于超薄二维材料的传感器灵敏度的简单方法，在电子皮肤、人机界面、气体传感和环境监测等领域具有很大的应用潜力。
