in situ sem dc experiments in uppsala – update 01 july 2013
DESCRIPTION
In situ SEM DC experiments in Uppsala – update 01 July 2013. Tomoko Muranaka. Preparation. Cathode: Copper (SLAC etching + 1040deg H2 heating) EBSD analysed Anode: Tungsten 7um. Experiments. Grain dependent field emission measurement 5 measurements on (111), (101), (001) - PowerPoint PPT PresentationTRANSCRIPT
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In situ SEM DC experiments in Uppsala – update 01 July 2013
Tomoko Muranaka
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Preparation
• Cathode: Copper (SLAC etching + 1040deg H2 heating)– EBSD analysed
• Anode: Tungsten 7um
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Experiments
• Grain dependent field emission measurement– 5 measurements on (111), (101), (001)
• Field emission stability measurement– 1 measurement (for 2000 points, about
30minuites) on (111), (101), (001)• Breakdowns for warm-like feature observation– 1 BD on (111), (101), (001)– Supply 1kV at 5um gap then make the anode closer
step by step until the current constantly over 1uA.
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Measurement area101
111
001
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Field emission onset voltage
• The onset voltage varies 700-1000V except three spots (two on (101), one on (111)).
0 1 2 3 4 50
200
400
600
800
1000
1200onset voltage (measured current exceeded
10nA)
(001)(111)(101)
Run Number
Bias
Vol
tage
[V]
0 1 2 3 4 50
200
400
600
800
1000
1200onset voltage (measured current exceeded
0.5pA)
(001)(111)(101)
Run Number
Bias
Vol
tage
[V]
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Emission stability (001), 800V
1.00E-13
1.00E-12
1.00E-11
1.00E-10
1.00E-09
1.00E-08
1.00E-07
1.00E-06
Step (0-2000 measurement point)
Mea
sure
d Cu
rren
t [A]
• Ramping up from 600V, “stay” if the current once exceeded 0.5pA (background was 0.2pA). 2000 meas. points ~ 30minuites
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Emission stability (101), 600V
1.00E-13
1.00E-12
1.00E-11
1.00E-10
1.00E-09
1.00E-08
1.00E-07
1.00E-06
Step (0-2000 measurement point)
Mea
sure
d Cu
rren
t [A]
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Emission stability (111), 990V
1.00E-13
1.00E-12
1.00E-11
1.00E-10
1.00E-09
1.00E-08
1.00E-07
1.00E-06
Step (0-2000 measurement point)
Mea
sure
d Cu
rren
t [A]
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Breakdown site (001)
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Breakdown site (101)
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Breakdown site (111)
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Breakdown site (111)
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Anode tip after three BD