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Growth, Cathodoluminescence and Field Emission of ZnS Tetrapod Tree-like Heterostructures

Chen, Zhi-Gang ; Zou, Jin ; Liu, Gang ; Yao, Xiangdong ; Li, Feng ; Yuan, Xiao-Li ; Sekiguchi, Takashi ; Lu, Gao Qing ; Cheng, Hui-Ming

Advanced functional materials, 2008-10, Vol.18 (19), p.3063-3069 [Periódico revisado por pares]

Weinheim: WILEY-VCH Verlag

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  • Título:
    Growth, Cathodoluminescence and Field Emission of ZnS Tetrapod Tree-like Heterostructures
  • Autor: Chen, Zhi-Gang ; Zou, Jin ; Liu, Gang ; Yao, Xiangdong ; Li, Feng ; Yuan, Xiao-Li ; Sekiguchi, Takashi ; Lu, Gao Qing ; Cheng, Hui-Ming
  • Assuntos: cathodoluminescence ; dual-phase heterostructures ; field emission ; II-VI semiconductors ; zinc sulfide
  • É parte de: Advanced functional materials, 2008-10, Vol.18 (19), p.3063-3069
  • Notas: This work was supported by the Key Research Program of MOST, China (2006CB932703) and the Australian Research Council. We sincerely thank Prof. Enge Wang at Institute of Physics, Chinese Academy of Sciences, for very useful discussions in this work.
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  • Descrição: We report the growth mechanism, cathodoluminescence and field emission of dual phase ZnS tetrapod tree‐like heterostructures. This novel heterostructures consist of two phases: zinc blende for the trunk and hexagonal wurtzite for the branch. Direct evidence is presented for the polarity induced growth of tetrapod ZnS trees through high‐resolution electron microscopy study, demonstrating that Zn‐terminated ZnS (111)/(0001) polar surface is chemically active and S‐terminated (${\bar 1} \bar 1} \bar 1}$)/(000$\bar 1$) polar surface is inert in the growth of tetrapod ZnS trees. Two strong UV emissions centered at 3.68 and 3.83 eV have been observed at room temperature, which are attributed to the bandgap emissions from the zinc blende trunk and hexagonal wurtzite branch, indicating that such structures can be used as unique electromechanical and optoelectronic components in potential light sources, laser and light emitting display devices. In addition, the low turn‐on field (2.66 Vµm−1), high field‐enhancement factor (over 2600), large current density (over 30 mAcm−2 at a macroscopic field of 4.33 Vµm−1) and small fluctuation (∼1%) further indicate the availability of ZnS tetrapod tree‐like heterostructures for field emission panel display. This excellent field‐emission property is attributed to the specific crystallographic feature with high crystallinity and cone‐shape patterned branch with nanometer‐sized tips. Such a structure may optimize the FE properties and make a promising field emitter. Dual phase ZnS tetrapod tree‐like heterostructure with a zinc blende phase for the trunk and hexagonal wurtzite for the branches are synthesized (see figure). Superior field emission with a low turn‐on field, high field‐enhancement factor, large current density, and small fluctuation are observed.
  • Editor: Weinheim: WILEY-VCH Verlag
  • Idioma: Inglês
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