Chemical effect of Si+ ions on the implantation-induced defects in ZnO studied by a slow positron beam

Jiang, M.; Wang, D. D.; Chen, Z. Q.; Kimura, S.; Yamashita, Y.; Mori, A.; Uedono, A.
January 2013
Journal of Applied Physics;Jan2013, Vol. 113 Issue 4, p043506
Academic Journal
Undoped ZnO single crystals were implanted with 300 keV Si+ ions to a dose of 6 × 1016 cm-2. A combination of X-ray diffraction (XRD), positron annihilation, Raman scattering, high resolution transmission electron microscopy (HRTEM), and photoluminescence (PL) was used to study the microstructure evolution after implantation and subsequent annealing. A very large increase of Doppler broadening S parameters in Si+-implanted region was detected by using a slow positron beam, indicating that vacancy clusters or microvoids are induced by implantation. The S parameters increase further after annealing up to 700 °C, suggesting agglomeration of these vacancies or microvoids to larger size. Most of these defects are removed after annealing up to 1100 °C. The other measurements such as XRD, Raman scattering, and PL all indicate severe damage and even disordered structure induced by Si+ implantation. The damage and disordered lattice shows recovery after annealing above 700 °C. Amorphous regions are observed by HRTEM measurement, directly testifies that amorphous phase is induced by Si+ implantation in ZnO. Analysis of the S - W correlation and the coincidence Doppler broadening spectra gives direct evidence of SiO2 precipitates in the sample annealed at 700 °C, which strongly supports the chemical effect of Si ions on the amorphization of ZnO lattice.


Related Articles

  • Defects and voids in He[sup +] -implanted Si studied by slow-positron annihilation and transmission electron microscopy. Zhang, M.; Scholz, R.; Weng, H.; Lin, C. // Applied Physics A: Materials Science & Processing;1998, Vol. 66 Issue 5, p521 

    Abstract. The distribution and annealing behavior of defects in crystalline silicon caused by 7 x 10[sup 16]/cm[sup 2] He[sup +] implantation were investigated by slow-positron annihilation technique, transmission electron microscopy, Rutherford backscattering, and channeling spectroscopy. It...

  • Positron annihilation spectroscopic studies of solvothermally synthesized ZnO nanobipyramids and nanoparticles. Ghoshal, Tandra; Biswas, Subhajit; Kar, Soumitra; Chaudhuri, Subhadra; Nambissan, P. M. G. // Journal of Chemical Physics;2/21/2008, Vol. 128 Issue 7, p074702 

    Zinc oxide (ZnO) samples in the form of hexagonal-based bipyramids and particles of nanometer dimensions were synthesized through solvothermal route and characterized by x-ray diffraction and transmission electron microscopy. Positron annihilation experiments were performed to study the...

  • Positron annihilation studies of defects and interfaces in ZnS nanostructures of different crystalline and morphological features. Biswas, Subhajit; Kar, Soumitra; Chaudhuri, Subhadra; Nambissan, P. M. G. // Journal of Chemical Physics;10/28/2006, Vol. 125 Issue 16, p164719 

    Nanostructures of ZnS, both particles and rods, were synthesized through solvothermal processes and characterized by x-ray diffraction and high resolution transmission electron microscopy. Positron lifetime and Doppler broadening measurements were made to study the features related to the defect...

  • Effect of implanted species on thermal evolution of ion-induced defects in ZnO. Azarov, A. Yu.; Hallén, A.; X. L. Du; Rauwel, P.; Kuznetsov, A. Yu.; Svensson, B. G. // Journal of Applied Physics;2014, Vol. 115 Issue 7, p1 

    Implanted atoms can affect the evolution of ion-induced defects in radiation hard materials exhibiting a high dynamic annealing and these processes are poorly understood. Here, we study the thermal evolution of structural defects in wurtzite ZnO samples implanted at room temperature with a wide...

  • Microstructure of Equal-Channel Angular Pressed Cu and Cu-Zr Samples Studied by Different Methods. Kužel, R.; Janeček, M.; Matěj, Z.; Čížek, J.; Dopita, M.; Srba, O. // Metallurgical & Materials Transactions. Part A;May2010, Vol. 41 Issue 5, p1174 

    Polycrystalline samples of technical-purity Cu (99.95 wt pct) and Cu with 0.18 wt pct Zr have been processed at room temperature by equal-channel angular pressing (ECAP). The microstructure evolution and its fragmentation after ECAP were investigated by transmission electron microscopy (TEM),...

  • Probing Phase Evolution Behavior during Nanocrystallization of Metallic Glass Using Positron Annihilation Spectroscopy. Srivastava, A.; Srivastava, D.; Dey, G.; Sudarshan, K.; Pujari, P. // Metallurgical & Materials Transactions. Part A;Jul2009, Vol. 40 Issue 7, p1757 

    Positron annihilation lifetime spectroscopy and coincidence Doppler broadening (CDB) techniques have been used to study the nanocrystallization behavior of soft magnetic materials, using Metglas 2826MB as an example. Transmission electron microscopy (TEM) and X-ray diffraction (XRD)...

  • Properties of sol-gel derived YAG:Eu3+ hierarchical nanostructures with their time evolution studies. Sharma, Prashant K.; Kumar, Manvendra; Singh, Prashant K.; Pandey, Avinash C.; Singh, V. N. // Journal of Applied Physics;Feb2009, Vol. 105 Issue 3, pN.PAG 

    Eu3+ doped yttrium aluminum garnet (YAG) nanoparticles were synthesized by sol-gel method. The samples were characterized by x-ray diffraction (XRD), transmission electron microscopy (TEM), and photoluminescence (PL) spectroscopy including vacuum ultraviolet (VUV) PL spectroscopy. XRD confirmed...

  • Crystallization of amorphous WN[sub x] films. Suh, Bong-Seok; Cho, Heung-Kuon; Lee, Yoon-Jik; Lee, Won-Jun; Park, Chong-Ook // Journal of Applied Physics;4/1/2001, Vol. 89 Issue 7 

    The microstructural changes of WN[sub x] films during annealing were analyzed using transmission electron microscopy and x-ray diffraction. Amorphous WN[sub x] films eventually crystallized to a two-phase mixture of W and W[sub 2]N through the primary crystallization and eutectic...

  • Converting Layered Zinc Acetate Nanobelts to One-dimensional Structured ZnO Nanoparticle Aggregates and their Photocatalytic Activity. Ye Zhang; Feng Zhu; Junxi Zhang; Lingli Xia // Nanoscale Research Letters;Jun2008, Vol. 3 Issue 6, p201 

    We were successful in synthesizing periodic layered zinc acetate nanobelts through a hydrothermal solution process. One-dimensional structured ZnO nanoparticle aggregate was obtained by simple thermal annealing of the above-mentioned layered ZnO acetate nanobelts at 300 °C. The morphology,...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics