L.Dehimi 6-7-2007 1
Comparison of Full and Analytical Simulations
UpdateSalim Aoulmit, Lakhdar Dehimi, Achour Saadoune
(LMSM Laboratory Biskra U)Craig Buttar, Dima Maneuski
(Glasgow U)Chris Bowdery, Michal Koziel,André Sopczak
(Lancaster U)
L.Dehimi 6-7-2007 2
Outline
• Improvement of Analytical Model and comparison with Full Simulation.
• Confirmation of trap concentration effect.
• Studying the effect of occupancy.
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Introduction• Recall last meeting: ongoing comparison
between Analytical Model and 2-phase CP-CCD Full Simulation. New cross checks with Dima’sFull Simulations.
• Now: improved AM with respect to full simulation* tjoin depending on the trap level.* time spent under each node is different.
• Effect of occupancy on CTI value is introduced by correlation of waiting time and clock frequency.
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Recall: Good Agreement AM-Glasg-Lancs 0.17eV traps
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Updated Comparison: AM-Glasg-Lancs 0.44eV
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Improved AM• Improved model is done in two steps:
1) Charge from deep level need more time to join their parent packet, so we suppose:
* For 0.17 eV tjoin=tsh.* For 0.44 eV tjoin=2*tsh.
2) CTI=CTI(1)+CTI(2), because the shift time is not the same.
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AM-ImpAM 0.17eV
100 120 140 160 180 200 220 2400
0.5
1
1.5
2
2.5x 10-3
Temperature (K)
CTI
Improved AMAM
50 MHz0.17 eV1e12/cm3Occupancy=1%
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AM-ImpAM 0.44
200 250 300 350 400 450 500 5500
0.2
0.4
0.6
0.8
1
1.2
1.4x 10-3
Temperature (K)
CTI
Analytical Model tjoin=tshAnalytical Model tjoin=2tshImproved Analytical Model
50 MHz0.44 eV1e12/cm3Occupancy=1% (including different
shift times)
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ImpAM-Glasg-Lancs 0.17 eV traps
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ImpAM-Glasg-Lancs 0.44 eV
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CTI vs Trap concentration
1 0 1 0 1 0 1 1 1 0 1 2
10 -5
10 -4
10 -3
50 M H z0 .17 eVO ccupancy 1%
C
TI
N T (cm 3)
T = 1 6 0 KT = 1 8 5 K
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Occupancy Study
• Simultaneous change of occupancy occand waiting time tw.
• At very high temperatures, the emission time is very short, and independent of the occupancy traps are empty when the next charge package arrives.
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Occupancy 0.17eV traps. 50MHz
100 120 140 160 180 200 220 2400
0.5
1
1.5
2
2.5
x 10-3
Temperature (K)
CTI
Improved AM Occ=0.1%Improved AM Occ=1%Full Sim Glasgow Occ=0.1%Full Sim Glasgow Occ=1%
50MHz0.17 eV1e12/cm3
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Occupancy 0.17eV traps. 25MHz
100 120 140 160 180 200 220 2400
0.5
1
1.5
2
2.5
3
3.5
4x 10
-3
Temperature (K)
CTI
Improved AM Occ=0.1%Improved AM Occ=1%Full Sim Glasgow Occ=0.1%Full Sim Glasgow Occ=1%
25MHz0.17 eV1e12/cm3
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Occupancy 0.44eV traps. 50MHz
200 250 300 350 400 450 500 5500
0.5
1
1.5x 10-3
Temperature (K)
CTI
Improved AM Occ=0.1%Improved AM Occ=1%Full Sim Glasgow Occ=0.1%Full Sim Glasgow Occ=1%
50MHz0.44 eV1e12/cm3
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Occupancy 0.44eV traps. 25MHz
200 250 300 350 400 450 500 5500
0.5
1
1.5
2
2.5x 10-3
Temperature (K)
CTI
Improved AM Occ=0.1%Improved AM Occ=1%Full Sim Glasgow Occ=0.1%Full Sim Glasgow Occ=1%
25MHz0.44 eV1e12/cm3
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Occupancy 0.44eV traps. 10MHz
200 250 300 350 400 450 5000
0.5
1
1.5
2
2.5
3
3.5
4
x 10-3
Temperature (K)
CTI
Improved AM Occ=0.1%Improved AM Occ=1%Full Sim Glasgow Occ=0.1%Full Sim Glasgow Occ=1%
10MHz0.44 eV1e12/cm3
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Change of Width of CTI Curve
0.01 0.1 1100
105
110
115
120
125
130
13550 MHz0.17 eVCTI=11e12/cm3
W
idth
of
CTI
cur
ve (K
)
Occupency (%)
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200 250 300 350 400 450 500 5500
0.5
1
1.5
2
2.5
3
3.5x 10-3
Temperature (K)
CTI
Improved AM Occ=0.1%Improved AM Occ=1%AM Occ=0.1%AM Occ=1%
10MHz0.44 eV
Comparative AM-Imp AM Occupancy Study
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Delta CTI Amplitude
0 10 20 30 40 500.0
2.0x10-5
4.0x10-5
6.0x10-5
8.0x10-5
1.0x10-4
1.2x10-4
1.4x10-4
1.6x10-4
1.8x10-4
2.0x10-4
0.17 eV 0.44 eV
Del
ta C
TI A
mpl
itude
Frequency (MHz)
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Conclusions/Outlook• 0.17eV traps: Glasgow, Lancaster and Analytic Simulations
agree well. For low temperature region only analytical model predicts CTI values.
• 0.44eV traps, analytical model agree better with Lancaster full simulation. Improvement to analytical model: tjoin for 0.44eV is larger than the one used for 0.17eV and CTI is considered at different times in both node.
• Improved AM agree better with Full Simulations.• Linearity of CTI with trap concentration Linearity is confirmed
with factor 1.• As the frequency decrease the change in the CTI Amplitude
is more visible • Occupancy effect study: impAM is more consistent with
Konstantin’s thesis plot (increased CTI amplitudes). Still larger effect in Konstantin’s plot. This is may due to clocking form. Further comparisons with full simulation needed with rectangular/square clocking voltage.