Technology and TEM characterization of Al doped ZnO nanomaterials
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1 Technology and TEM characterization of Al doped ZnO nanomaterials 國立成功大學 (NCKU) 材料科學及工程系 (MSE) 劉全璞 (Chuan-Pu Liu)
2 Outline Introduction of ZnO Doping ZnO nanomaterials in CVD Al doped ZnO Nanowires Al doped ZnO Nanotube/Nanowire junctions Al doped ZnO rectangular nanorods Conclusions
3 Introduction of ZnO Wurtzite structure Wide and direct band-gap (3.3ev) semiconductor Polar surface (0001)/(0001) Novel nanostructures High exciton binding energy (60mev) Candidate for optoelectronic devices and many more
4 Applications of ZnO Piezoelectric material Varistor (surface acoustic wave devices ) (bulk or thin film) Gas sensor (H 2, CO and H 2 O) DMS (diluted magnetic semiconductor) TCO (transparent conductive oxide) Light-emitting devices ( nano-structure and thin film) Doping is required for functional devices
5 Method: thermal evaporation O 2 gas Quartz tube Heater x x mm Pressure meter Pumping Ar gas Substrate: Si (100) Source: Zn or Zn+Al mixed powder Adaptor Alumina boat
6 Simple and new concept Alloying-evaporation deposition (AED) D(T) = D 0 exp(-δh /RT) V tot =V Zn + V Zn-Al Zn: Al= 93: 7 wt. % V: vapor pressure
7 TEM characterization of Al:ZnO nanowires alloying treatment temperature of 420oC Al / (Al+Zn) : 2.5 at.% determined by EELS First to demonstrate ZnO nanostructures doped with Al from TEM Al mapping Applied Physics Letters, 88, (2006)
8 Core-loss analysis for Zn and Al by EELS Signal width: 200eV Elem. Areal density (atoms/nm**2) Zn 1.42e+015 ± 1.4e+014 / sum(spec) Al 2.27e+014 ± 2.3e+013 / sum(spec) Relative quantification: Elem. Atomic ratio (/Zn) Percent content Zn 1.00 ± ± 11.5 Al 0.16 ± ± 1.8 Beam energy (kev): 200 Convergence angle (mrad):1 Collection angle (mrad):10 Cross model: hydrogenic Background fit model: power law
9 TEM of Al:ZnO nanowire/nanotube junction structures alloying treatment temperature of 500 o C Al / (Al +Zn) : 12 at.% determined by EELS Al concentration in the ZnO nanostructures could be adjusted by varying the temperature of alloying treatment
10 Possible reasons for the formation of nanowire/nanotubes junction structures d (0001) = 5.16 Å d (0110) = 2.82 Å d (0001) = 5.11 Å d (0110) = 2.81 Å d (0001) = 5.05 Å d (0110) = 2.81 Å Al:ZnO nanowire Al:ZnO necking region Al:ZnO nanotube Lattice constant decreases 2% from nanowire to nanotube Al concentration increase Lattice mismatch Nanotube formed to release the strain
11 CL of ZnO and Al:ZnO 1D nanostructures Blue-shift of UV peak due to Al incorporation Green/UV decrease due to Al incorporation A decrease in oxygen vacancy ion due to Al incorporation concentration V o +Al 2 O 3 2Al Zn +3O o (Ryoken et al, J. Mater. Res., 20, 10, 2005)
12 Doping-induced rectangular nanorods Temperature O 2 injection 650 C, 3 torr, 1 hour 500 C, 30 min Ar injection Substrate :Si (100) Source : Al+Zn Time Horizontal tube furnace system 1.5 cm D C Source B gas flow A 1.5 cm Nanotechnology, in press, 2008 Jan
13 SEM results Lengths of 5 10 microns, widths of nm thicknesses of nm
14 TEM results the atomic ratio of Al to (Al+Zn) in the ZnO rectangular nanorods and nanosheets from TEM EELS results is around 6.13 and 4.07 at.%, respectively.
15 Growth mechanism [01-10]
16 More doping-induced nanostructures (c) c-ax is Root: Zn:O 52.4 : 47.6 Tip:Zn:O 48.7 : nm Two-luminescenced Nanorods
17 Low EELS of (ZnAl)O nanobelts by STEM SI D C C D? Surface plasma -related? O-2p Zn-3d BPR O-2s Al related? center Edge off
18 Low EELS of (ZnAl)O nanowire by STEM SI Eg threshold b b a a? Surface plasma -related? SPR BPR O-2p Zn-3d Al related? O-2s roi@8 center Edge off
19 Mapping for the unknown peak energy at 4-5 ev Only occurring from the edge
20 Local [Al] variation Axial Lateral
21 Selective Growth of ZnO nanorods on ZnO dots (1) Growth of ZnO pyramids by RF sputtering on Si(111) (a) (b) ~64~ 100nm 100nm
22 TEM characterisation of ZnO pyramids
23 (2) Growth of ZnO nanowires only on pre-synthesized ZnO dots (a) (a) (b)
24 TEM characterisation of ZnO nanowires and the interface
25 Conclusions Al doping technology proposed for growing ZnO nanomaterials by CVD Successful Al doping into ZnO nanowires Doping induced Nanotube/nanowir, rectangular nanorods, and two-luminescenced nanorods TEM characterization of microstructure and electronic structures of Al doped ZnO nanowires Selective growth of Al-doped ZnO nanowires on ZnO pyramids
26 Acknowledgement Students: Wang Rei-Chi Chi; Jiann-Han Huang ( 黃俊翰 ), Yu-Han Liao ( 廖譽翰 ) and Jiann-Lin Kuo ( 郭建麟 ) The work was supported by NSC, Taiwan and Air Force, USA. The authors thank the center for micro/nano science and The authors thank the technology,, National Cheng Kung University, Taiwan for the provision of the HRTEM.
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