Zhang Xiaotong, Qiu Yu, Yang Dechao, Li Bing, Zhang Heqiu, Hu Lizhong
School of Physics, Dalian University of Technology Dalian 116024 People's Republic of China
The Key Laboratory for Micro/Nano Technology and System of Liaoning Province, Dalian University of Technology Dalian 116024 People's Republic of China.
RSC Adv. 2018 Apr 23;8(28):15290-15296. doi: 10.1039/c8ra01189c.
In this work, an ultraviolet (UV) photodetector based on a ZnO nanowires (NWs) array with metal-semiconductor-metal Schottky junction structure was successfully fabricated on a flexible polyester fibre substrate by a low-temperature hydrothermal method. Subjected to a 0.2% tensile strain at -1 V, the and sensitivity of the as-prepared UV photodetector are lifted by 82% and 130%, respectively. Furthermore, the response speed and recovery speed are significantly raised under the same tensile strain. The working principle can be explained as that the Schottky barrier height (SBH) is effectively improved by the negative strain-induced polarization at the metal-ZnO interface which is favorable for the separation of photogenerated electron-hole pairs. This work not only provides a facile and promising means to optimize the performance of a ZnO based MSM photodetector by applying a tensile strain but also opens up the way for fabrication and integration of ZnO photodetectors on flexible polyester fiber substrates.
在这项工作中，通过低温水热法成功地在柔性聚酯纤维基板上制备了一种基于具有金属 - 半导体 - 金属肖特基结结构的氧化锌纳米线阵列的紫外（UV）光电探测器。在 -1V 下施加 0.2% 的拉伸应变时，所制备的紫外光电探测器的响应度和灵敏度分别提高了 82% 和 130%。此外，在相同的拉伸应变下，响应速度和恢复速度也显著提高。其工作原理可以解释为，金属 - 氧化锌界面处的负应变诱导极化有效地提高了肖特基势垒高度（SBH），这有利于光生电子 - 空穴对的分离。这项工作不仅提供了一种通过施加拉伸应变来优化基于氧化锌的 MSM 光电探测器性能的简便且有前景的方法，还为在柔性聚酯纤维基板上制造和集成氧化锌光电探测器开辟了道路。
