The Preparation And Nanophotonics Properties Of The Pure And Co-doped ZnTe Nanowires

Nanophotonics has become a hot research direction in nanotechnology.The characteristics of the photon has potential and superiority,making up for the inadequacy of electronics.Diluted magnetic semiconductor（DMS）has properties of magnetism and semiconductor,and there are many applications in optics,spintronics and data storage.In superlattice and nanocrystalline structures,the excitonic magnetic polaron（EMP）as a new excitation was identified.Since spin electron transport has characteristics,spin polaron transmission can improve the speed and flux of information processing in DMS.We use the optical properties of EMP to achieve efficient information processing.In report by Arfan of our group,the Mn and Ni doping in ZnTe nanobelts were not found obvious EMP profile,which indicates a difficulty in the formation of EMP in TM doped ZnTe.Main contents of this paper:（1）We prepared pure ZnTe and Co（II）doped ZnTe nanowires by the chemical vaper deposition（CVD）method.We used SEM,EDS,Raman and XRD to analyzed microstructure,components and growth mechanism of nanowires.（2）We study theμ-PL of nanowires by nanophotonics:theμ-PL detection can find elementary excitation and interactions in nanoscale,which playing an important role in the study of material.The power and temperature dependentμ-PL detection of single nanowire demonstrated double bands near its band-edge,and their ferromagnetism were identified.With the increasing of excited power,the luminescence intensity of EMP is significantly increased and the peak position is getting more stable,indicating the second peak is EMP.EMP becomes dominant with good stability,indicating that it overcomes the shielding of photo-induced carriers and its stability is high,so the luminescence becomes more stable.Compared with the carrier effect and phonon scattering of Mn（II）and Ni（II）doped ZnTe,Co-Co spin ferromagnetic coupling exists in Co（II）doping system,which supports the formation of EMP in Co doped ZnTe nanowires.This EMP in dilute magnetic semiconductor nanostructure will facilitate to realize the spin polarized nanophotonic devices.（3）We try to replace ZnO with Zn₂Ge O₄ to form DMS.We prepared Mn-doped Zn₂Ge O₄by hydrothermal method,and studied the growth mechanism,morphology and elements composition.The influence of temperature of annealing treatment on the morphology was studied.However,our experiment result was unable to prove the existence of ferromagnetic coupling ions,it is probably because the distance between energy level of Mn and the conduction band or bound state is too far,which leading no formation of ferromagnetic coupling between Mn ions.