电子束辐照对单根Zn2GeO4纳米线电学特性的影响

电子束辐照对单根Zn₂GeO₄纳米线电学特性的影响

李斯佳，吴 幸，孙 俊，孙立涛^*

（东南大学-FEI纳皮米中心，MEMS教育部重点实验室，东南大学，江苏南京210096）

摘要：利用透射电子显微技术，对Zn₂GeO₄纳米线的微观结构以及元素成分进行了表征。采用STM-TEM电学测试样品杆在透射电子显微镜内原位构建一个基于Zn₂GeO₄纳米线的金属-半导体-金属（M-S-M）结构，在结构两端加电，发现随着辐照强度的增加，流过纳米线的电流增加且I-V曲线的开启电压减小。进一步分析表明这是由于金属电极中的电子受到更强的激发更容易越过金属与半导体形成的肖特基势垒，因此在原位TEM电学测试过程中，应该考虑到电子束辐照的影响，以便获得更加准确的测量结果。

关键词：Zn₂GeO₄纳米线；电子束辐照；肖特基结；原位透射电子显微技术

中图分类号：TN304.2；TG115.21⁺5.3；O766⁺.1   文献标识码：A  doi:10.3969/j.1000-6281.2015-04.002

The effect of electron irradiation on the electrical characteristics of individual Zn₂GeO₄ nanowires

LI Si-jia, WU Xing, SUN Jun, SUN Li-tao*

(SEU-FEI Nano-Pico Center, Key laboratory of MEMS of Ministry of education，Southeast University，Nanjing Jiangsu 210096，China)

Abstract:The microstructure of Zn₂GeO₄ nanowires and elemental composition were characterized by transmission electron microscopy (TEM). By using STM-TEM electrical test holder, Zn₂GeO₄ nanowire based metal- semiconductor – metal (M-S-M) structure was in-situ constructed inside the TEM. With the increase of irradiation intensity, the current through the nanowire increases and the open voltage of the I-V curve decreases. This is because the electron in metal electrode is strongly inspired, and it passes over the schottky barrier between metal and semiconductor more easily. Therefore, in order to obtain more accurate measurement results, consideration should be given to the influence of electron beam irradiation in the process of in-situ TEM electrical tests.

Keywords:Zn₂GeO₄ nanowires；electron beam irradiation；Schottky junction；in-situtransmission electronmicroscopy 

全文下载请到同方知网、万方数据或重庆维普等数据库下载！

[1] Sato J, Kobayashi H, Ikarashi K, et al. Photocatalytic activity for water decomposition of RuO₂-dispersed Zn₂GeO₄ with d (10) configuration [J]. J Phys Chem B, 2004, 108(14): 4369–4375.

[2] Liang J, Xu J, Gu Q, et al. A novel Zn₂GeO₄ superstructure for effective photocatalytic hydrogen generation [J]. J Mater Chem A, 2013, 1(26): 7798-7805.

[3] Lin K Y, Ma BJ, Su W G, et al. Improved photocatalytic hydrogen generation on Zn₂GeO₄ nanorods with high crystallinity [J]. Appl Surf Sci, 2013, 286: 61–65.

[4] Liu Q, Zhou Y, Kou J H, et al. High-Yield Synthesis of Ultralong and Ultrathin Zn₂GeO₄ Nanoribbons toward Improved Photocatalytic Reduction of CO₂ into Renewable Hydrocarbon Fuel [J]. J Am Chem Soc, 2010, 132(41): 14385-14387.

[5] Liu Q, Zhou Y, Tian Z P, et al. Zn₂GeO₄ crystal splitting toward sheaf-like, hyperbranched nanostructures and photocatalytic reduction of CO₂ into CH₄ under visible light after nitridation [J]. J Mater Chem, 2012, 22(5): 2033-2038.

[6] Yang M, Jin X Q. Facile synthesis of Zn₂GeO₄ nanorods toward improved photocatalytic reduction of CO₂ into renewable hydrocarbon fuel [J]. J Cent South Univ, 2014, 21(7): 2837-2842.

[7] Huang J H, Ding K N, et al. Synthesis and photocatalytic Activity of Zn₂GeO₄ nanorods for the degradation of organic pollutants in water [J]. Chem Sus Chem, 2008, 1(12): 1011–1019.

[8] Yu L, Zou R J, Zhang Z Y, et al. A Zn₂GeO₄-ethylenediamine hybrid nanoribbon membrane as a recyclable adsorbent for the highly efficient removal of heavy metals from contaminated water [J]. Chem Commun, 2011, 47(38): 10719-10721.

[9] Feng J K, Lai M O, Lu L. Zn₂GeO₄ Nanorods synthesized by low-temperature hydrothermal growth for high-capacity anode of lithium battery [J]. Electrochem Commun, 2011, 13(3): 287–289.

[10] Yi R, Feng J K, Lü D P, et al. Amorphous Zn₂GeO₄ nanoparticles as anodes with high reversible capacity and long cycling life for Li-ion batteries [J]. Nano Energy, 2013, 2(4): 498–504.

[11] Zou F, Hu X L, Qie L, et al. Facile synthesis of sandwiched Zn₂GeO₄-graphene oxide nanocomposite as a stable and high-capacity anode for lithium-ion batteries [J]. Nanoscale, 2014, 6(2):924-930.

[12] Chen W M, Lu L Y, Maloney S, et al. Coaxial Zn₂GeO₄@carbon nanowires directly grown on Cu foils as high-performance anodes for lithium ion batteries [J]. Phys Chem Chem Phys, 2015, 17(7): 5109-5114.

[13] Wang R, Wu S P, Lü Y C,et al. Partially Crystalline Zn₂GeO₄ Nanorod/Graphene Composites as Anode Materials for High Performance Lithium Ion Batteries [J]. Langmuir, 2014, 30(27): 8215–8220.

[14] Lu L Y, Chen J J, Wang W Y. Wide bandgap Zn₂GeO₄ nanowires as photoanode for quantum dot sensitized solar cells [J]. Appl Phys Lett, 2013, 103(12): 123902.

[15] Yan C Y, Singh N, Lee P S. Wide-bandgap Zn₂GeO₄ nanowire networks as efficient ultraviolet photodetectors with fast response and recovery time [J]. Appl Phys Lett, 2010, 96(5): 053108.

[16] Zhang Q H, Wang J. Synthesis and characterization of Zn₂GeO₄:Mn²⁺ phosphor for field emission displays [J]. Appl Phys A, 2012, 108(4): 943-948.

[17] Wang J X, Yan C Y, Magdassi S, et al. Zn₂GeO₄ nanowires As efficient electron injection material for electroluminescent devices [J]. ACS Appl Mater Interfaces, 2013, 5(15): 6793–6796.

[18] Xu J, Wang C R, et al. Structural, vibrational and luminescence properties of longitudinal twinning Zn₂GeO₄ nanowires [J]. Cryst Eng Comm, 2013, 15(4): 764-768.

[19] Zhang Z Y, Jin C H, Liang X L, et al. Current-voltage characteristics and parameter retrieval of semiconducting nanowires [J].  Appl Phys Lett, 2006, 88(7): 073102.

[20] David B，Williams C，Barry Carter. Transmission Electron Microscopy [M].  2009：62.

[21] Tan Y, Wang Y G. The effect of an incident electron beam on the I-V characteristics of a Au-ZnSe nanowire-Au nanostructure [J]. Chinese Phys Lett, 2013, 30(4): 04790.

[22] Zhang Z Y, Yao K, Liu Y, et al.Quantitative analysis of current–voltage characteristics of semiconducting nanowires: Decoupling of contact effects [J]. Adv Funct Mater,2007, 17(14): 2478–2489.