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 and Cheng, Hui-Ming (2008) Growth, Cathodoluminescence and Field Emission of ZnS Tetrapod Tree-like Heterostructures. Advanced Functional Materials, 18 19: 3063-3069. doi:10.1002/adfm.200800447

Author Chen, Zhi-Gang
Zou, Jin
Liu, Gang
Yao, Xiangdong
Li, Feng
Yuan, Xiao-Li
Sekiguchi, Takashi
Lu, Gao Qing
Cheng, Hui-Ming
Title Growth, Cathodoluminescence and Field Emission of ZnS Tetrapod Tree-like Heterostructures
Journal name Advanced Functional Materials   Check publisher's open access policy
ISSN 1616-301X
Publication date 2008-10-09
Year available 2008
Sub-type Article (original research)
DOI 10.1002/adfm.200800447
Open Access Status
Volume 18
Issue 19
Start page 3063
End page 3069
Total pages 7
Place of publication Germany
Publisher Wiley - V C H Verlag GmbH & Co. KGaA
Language eng
Subject 970102 Expanding Knowledge in the Physical Sciences
100708 Nanomaterials
Abstract 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 ((1) over bar(1) over bar(1) over bar)/(000 (1) over bar) 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 V mu m(-1)), high field-enhancement factor (over 2600), large current density (over 30 mAcm(-2) at a macroscopic field of 4.33 V mu m(-1)) and small fluctuation (similar to 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.
Keyword cathodoluminescence
dual-phase heterostructures
field emission
II-VI semiconductors
zinc sulfide
Q-Index Code C1
Q-Index Status Confirmed Code
Grant ID 2006CB932703
Institutional Status UQ

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Created: Thu, 19 Mar 2009, 01:52:33 EST by Sally Beard on behalf of Materials