Yibi Yusufkadie, Chen Jiawei, Xue Jie, Song Jizhong, Zeng Haibo
Ministry of Industry and Information Technology of the China Key Laboratory of Advanced Display Materials and Devices, Institute of Optoelectronics & Nanomaterials, College of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China.
Ministry of Industry and Information Technology of the China Key Laboratory of Advanced Display Materials and Devices, Institute of Optoelectronics & Nanomaterials, College of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China.
Sci Bull (Beijing). 2017 May 30;62(10):693-699. doi: 10.1016/j.scib.2017.04.014. Epub 2017 Apr 20.
Recently, the localized surface plasmon resonance (LSPR) concept was expanded from noble metals to doped semiconductor nanocrystals (NCs). However, the strengthening of the intrinsically very weak LSPR in NCs remains a great challenge for its applications in optics, electronics and optoelectronics fields. In this work, we report on the remarkable strengthening and controllability of LSPR in ZnO through a dual-doping strategy. First, high quality In-doped ZnO (IZO) NCs with intense LSPR were synthesized by a simple single-pot method. Importantly, the LSPR can be tuned by simply adjusting the concentration of In dopant, as well as by UV light irradiation (photo-induced doping). The pattern of electricity of an IZO NC film matches the shift of LSPR independent of dopant concentration. The UV light irradiation clearly enhanced the electrical properties of the films (350Ω/sq) due to increase carrier density explained by LSPR and confirmed by X-ray photoelectron spectroscopy. The IZO NCs can be easily dispersed in various organic solvents and serve as inks for assembling uniform films via solution processes. These IZO NC ink is promising for application in next-generation solution-based field effect transistors and other optoelectronic devices.
最近，局域表面等离子体共振（LSPR）概念已从贵金属扩展到掺杂半导体纳米晶体（NCs）。然而，增强NCs中本质上非常微弱的LSPR对其在光学、电子和光电子领域的应用仍然是一个巨大挑战。在这项工作中，我们报道了通过双掺杂策略实现的ZnO中LSPR的显著增强和可控性。首先，通过简单的单锅法合成了具有强烈LSPR的高质量In掺杂ZnO（IZO）NCs。重要的是，LSPR可以通过简单地调节In掺杂剂的浓度以及通过紫外光照射（光诱导掺杂）来调节。IZO NC薄膜的电学模式与LSPR的移动相匹配，与掺杂剂浓度无关。紫外光照射由于LSPR解释并经X射线光电子能谱证实的载流子密度增加而明显增强了薄膜的电学性能（方块电阻为350Ω/sq）。IZO NCs可以很容易地分散在各种有机溶剂中，并用作通过溶液工艺组装均匀薄膜的墨水。这些IZO NC墨水有望应用于下一代基于溶液的场效应晶体管和其他光电器件。
