Liu Peisheng, Wang Hao, Chen Jun, Li Xiaoming, Zeng Haibo
Institute of Optoelectronics &Nanomaterials, Jiangsu Key Laboratory of Advanced Micro &Nano Materials and Technology, College of Material Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China.
Jiangsu Key Laboratory of ASCI Design, College of Electronics and Information, Nantong University, Nantong 226019, China.
Sci Rep. 2016 Jun 21;6:28131. doi: 10.1038/srep28131.
Applications of ZnMgO nanocrystals (NCs), especially in photoelectric detectors, have significant limitations because of the unresolved phase separation in the synthesis process. Here, we propose a rapid and highly efficient ZnMgO NC alloying method based on pulsed laser ablation in liquid. The limit value of homogeneous magnesium (Mg) is pushed from 37% to 62%, and the optical band gap is increased to 3.7 eV with high doping efficiency (>100%). Further investigations on the lattice geometry of ZnMgO NCs indicate that all ZnMgO NCs are hexagonal wurtzite structures, and the (002) and (100) peaks shift to higher diffraction angles with the increase in Mg doping content. The calculated results of the lattice constants a and c slightly decrease based on Bragg's law and lattice geometry equations. Furthermore, the relationship between annealing temperature and the limit value of homogeneous Mg is examined, and the results reveal that the latter decreases with the former because of the phase separation of MgO. A probable mechanism of zinc magnesium alloy is introduced to expound on the details of the laser-alloying process.
ZnMgO纳米晶体（NCs）的应用，尤其是在光电探测器中的应用，由于在合成过程中未解决的相分离问题而存在显著局限性。在此，我们提出了一种基于液体中脉冲激光烧蚀的快速高效的ZnMgO NC合金化方法。均匀镁（Mg）的极限值从37%提高到62%，并且光带隙以高掺杂效率（>100%）增加到3.7 eV。对ZnMgO NCs晶格几何结构的进一步研究表明，所有ZnMgO NCs均为六方纤锌矿结构，并且随着Mg掺杂含量的增加，（002）和（100）峰向更高衍射角移动。基于布拉格定律和晶格几何方程，晶格常数a和c的计算结果略有下降。此外，研究了退火温度与均匀Mg极限值之间的关系，结果表明，由于MgO的相分离，后者随前者降低。引入了锌镁合金的一种可能机制来阐述激光合金化过程的细节。
