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.

L.Dehimi 6-7-2007 3

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.

L.Dehimi 6-7-2007 7

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)

L.Dehimi 6-7-2007 21

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.