Key Laboratory of Soft Chemistry and Functional Materials of Education Ministry, Nanjing University of Science and Technology, Nanjing 210094, China.
Shanghai Advanced Research Institute, Chinese Academy of Sciences, 99 Haike Road, Zhangjiang Hi-Tech Park, Pudong, Shanghai 201210, China.
Nanoscale. 2016 Apr 28;8(16):8924-30. doi: 10.1039/c6nr00089d.
ZnO semiconductor films with periodic 3D nanocave patterns were fabricated by the thermal nanoimprinting technology, which is promising for photodetectors with enhanced light harvesting capability. The Au nanoparticles were further introduced into the ZnO films, which boosts the UV response of ZnO films and extends the photodetection to visible regions. The best UV photoresponse was detected on the 3D nanocave ZnO-Au hybrid films, attributing to the light trapping mechanism of 3D periodic structures and the driving force of the Schottky barrier at the ZnO/Au interface, while the high visible photoresponse of ZnO-Au hybrid films mainly results from the hot electron generation and injection process over the Schottky junctions mediated by Au surface plasmon resonances. The work provides a cost-effective pathway to develop large-scale periodic 3D nanopatterned thin film photodetectors and is promising for the future deployment of high performance optoelectronic devices.
采用热压印技术制备了具有周期性 3D 纳米凹坑图案的 ZnO 半导体薄膜，该技术有望用于具有增强的光捕获能力的光电探测器。进一步将 Au 纳米颗粒引入 ZnO 薄膜中，这提高了 ZnO 薄膜的紫外响应并将光探测扩展到可见光区域。在 3D 纳米凹坑 ZnO-Au 杂化薄膜上检测到最佳的紫外光响应，这归因于 3D 周期性结构的光捕获机制和 ZnO/Au 界面处肖特基势垒的驱动力，而 ZnO-Au 杂化薄膜的高光响应主要归因于 Au 表面等离子体共振介导的肖特基结处的热电子产生和注入过程。该工作为开发大规模周期性 3D 纳米图案化薄膜光电探测器提供了一种具有成本效益的途径，有望在未来部署高性能光电设备。
