Performance and spectroscopic behaviour of DePFET ... - MPG HLL
Performance and spectroscopic behaviour of DePFET ... - MPG HLL
Performance and spectroscopic behaviour of DePFET ... - MPG HLL
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SDS 2009<br />
<strong>Performance</strong> <strong>and</strong> <strong>spectroscopic</strong> behavior <strong>of</strong><br />
<strong>DePFET</strong> Macropixels<br />
Thomas Lauf 1,3 , Sven Herrmann 1,3 , Peter Lechner 3,6 , Gerhard Lutz 3,6 , Michael Krumrey 5 ,<br />
Matteo Porro 1,3 , Rainer Richter 2,3 , Frank Scholze 5 , Lothar Strüder 1,3 , Johannes Treis 3,4 , Giulio de Vita 1,3<br />
1 Max-Planck-Institut für extraterrestrische Physik<br />
2 Max-Planck-Institut für Physik<br />
3 MPI Halbleiterlabor<br />
4 Max-Planck-Institut für Sonnensystemforschung<br />
5 Physikalisch-Technische Bundesanstalt<br />
6 PNSensor GmbH<br />
08/06/2009
Thomas Lauf, MPE / MPI Halbleiterlabor<br />
08/06/2009 2/18<br />
<strong>DePFET</strong> Macropixels<br />
• What is a <strong>DePFET</strong> Macropixel?<br />
• How is such a device operated?<br />
• First results <strong>of</strong> measurements at the BESSY<br />
synchrotron facility
Thomas Lauf, MPE / MPI Halbleiterlabor<br />
08/06/2009 3/18<br />
<strong>DePFET</strong> Macropixels<br />
Depleted P-channel Field Effect Transistor<br />
• Persistent potential minimum<br />
(Internal gate)<br />
• Low readout noise<br />
• First stage amplification<br />
Cut through a <strong>DePFET</strong> pixel cell
Thomas Lauf, MPE / MPI Halbleiterlabor<br />
08/06/2009 4/18<br />
<strong>DePFET</strong> Macropixels<br />
• Macropixel:<br />
Combination <strong>of</strong> Silicon Drift Detector (SDD)<br />
<strong>and</strong> <strong>DePFET</strong> readout device<br />
• Properties<br />
Decoupling <strong>of</strong> readout capacitance <strong>and</strong> size (SDD)<br />
Charge storage (<strong>DePFET</strong>)<br />
Readout on dem<strong>and</strong> (<strong>DePFET</strong>)<br />
Low readout capacity (<strong>DePFET</strong>)<br />
First stage amplification (<strong>DePFET</strong>)
Thomas Lauf, MPE / MPI Halbleiterlabor<br />
08/06/2009 5/18<br />
<strong>DePFET</strong> Macropixels<br />
• Homogeneous entrance window<br />
• 100% fill factor<br />
• Fully depleted bulk<br />
• Pixel sizes: 100 μm - 1 cm<br />
Cut through a macropixel cell
Thomas Lauf, MPE / MPI Halbleiterlabor<br />
08/06/2009 6/18<br />
<strong>DePFET</strong> Matrices<br />
Readout scheme<br />
- Global drain contact<br />
- Gate,Clear <strong>and</strong> Cleargate<br />
connected row-wise<br />
- Sources connected column-wise<br />
- Only one row is turned on <strong>and</strong><br />
read out<br />
Source follower readout<br />
- Column bias by current source<br />
- Alternatively: Conversion <strong>of</strong><br />
drain current
Thomas Lauf, MPE / MPI Halbleiterlabor<br />
08/06/2009 7/18<br />
<strong>DePFET</strong> Matrices<br />
ROW<br />
60<br />
50<br />
40<br />
30<br />
20<br />
10<br />
0<br />
0 10 20 30 40 50 60<br />
COLUMN<br />
4500<br />
4000<br />
3500<br />
3000<br />
2500<br />
2000<br />
1500<br />
1000<br />
500<br />
0<br />
ENERGY[ADU]<br />
• Frame stored in File<br />
• Subtract Offset<br />
• Filter Events<br />
– Discard data below<br />
threshold<br />
– Cluster adjacent pixels:<br />
• Singles (Sng)<br />
• Doubles (Dbl)<br />
• Triples (Trp)<br />
• Quadruples (Qud)
Thomas Lauf, MPE / MPI Halbleiterlabor<br />
08/06/2009 8/18<br />
<strong>DePFET</strong> Matrices<br />
Accumulated energy values
Thomas Lauf, MPE / MPI Halbleiterlabor<br />
08/06/2009 9/18<br />
<strong>DePFET</strong> Matrices<br />
Spectrum <strong>of</strong> an Fe55 source<br />
Energy resolution for all valid patterns<br />
ALL<br />
#<br />
Constant: 24283.18<br />
10<br />
4<br />
SNG<br />
DBL<br />
4<br />
10<br />
Mean: 5897.72<br />
TRP<br />
QUD<br />
Sigma: 54.49<br />
Counts<br />
10<br />
10<br />
3<br />
2<br />
3<br />
10<br />
2<br />
10<br />
FWHM: 128.31<br />
10<br />
10<br />
1<br />
0 2000 4000 6000 8000 10000 12000 14000 16000<br />
Energy [eV]<br />
1<br />
3000 4000 5000 6000 7000 8000 9000<br />
Energy [eV]<br />
Energy [eV]
Thomas Lauf, MPE / MPI Halbleiterlabor<br />
08/06/2009 10/18<br />
<strong>DePFET</strong> Macropixels<br />
Simbol-X detector hybrid, 500 μm pixel egde, 64x64 pixels
Thomas Lauf, MPE / MPI Halbleiterlabor<br />
08/06/2009 11/18<br />
Measurements & Results<br />
Measurements conducted at BESSY synchrotron facility<br />
• Linearity & Homegeneity<br />
Detector response to monoenergetic beam<br />
Measurements from 100 eV to 10 keV<br />
(Double Crystal Monochromator & SX700)<br />
• Charge collection<br />
Detector in tank conntected<br />
to SX700 beampipe
Thomas Lauf, MPE / MPI Halbleiterlabor<br />
08/06/2009 12/18<br />
Measurements & Results<br />
Some example spectra<br />
Counts Counts<br />
4<br />
10<br />
3<br />
10<br />
2<br />
10<br />
10<br />
1<br />
4<br />
10<br />
3<br />
10<br />
2<br />
10<br />
10<br />
ALL<br />
SNG<br />
DBL<br />
TRP<br />
QUD<br />
0 2000 4000 6000 8000 10000 12000 14000 16000<br />
ALL<br />
SNG<br />
DBL<br />
TRP<br />
QUD<br />
E=10 keV E=7.5 keV<br />
E=2.5 keV<br />
4<br />
10<br />
3<br />
10<br />
2<br />
10<br />
10<br />
1<br />
4<br />
10<br />
3<br />
10<br />
2<br />
10<br />
10<br />
ALL<br />
SNG<br />
DBL<br />
TRP<br />
QUD<br />
0 2000 4000 6000 8000 10000 12000 14000 16000<br />
ALL<br />
SNG<br />
DBL<br />
TRP<br />
QUD<br />
E=1.0 keV<br />
1<br />
0 2000 4000 6000 8000 10000 12000 14000 16000<br />
Energy [keV]<br />
1<br />
0 2000 4000 6000 8000 10000 12000 14000 16000<br />
Energy [keV]
Thomas Lauf, MPE / MPI Halbleiterlabor<br />
08/06/2009 13/18<br />
Measurements & Results<br />
Gain maps at different energies<br />
Row<br />
60<br />
Row<br />
60<br />
50<br />
50<br />
40<br />
30<br />
20<br />
10<br />
E = 7.5 keV<br />
Gain = 1.26 eV/ADU<br />
Var = 2.12 %<br />
40<br />
30<br />
20<br />
10<br />
E = 2.5 keV<br />
Gain = 1.27 eV/ADU<br />
Var = 1.71 %<br />
1.7<br />
1.6<br />
Gain [eV/ADU]<br />
0<br />
0 10 20 30 40 50 60<br />
Column<br />
0<br />
0 10 20 30 40 50 60<br />
Column<br />
1.5<br />
Row<br />
60<br />
Row<br />
60<br />
1.4<br />
50<br />
40<br />
30<br />
20<br />
E = 1.0 keV<br />
Gain = 1.28 eV/ADU<br />
Var = 2.58 %<br />
50<br />
40<br />
30<br />
20<br />
E = 0.5 keV<br />
Gain =1.30 eV/ADU<br />
Var = 2.88 %<br />
1.3<br />
1.2<br />
10<br />
10<br />
0<br />
0 10 20 30 40 50 60<br />
Column<br />
0<br />
0 10 20 30 40 50 60<br />
Column
Measurements & Results<br />
Linearity Measurements<br />
Thomas Lauf, MPE / MPI Halbleiterlabor<br />
08/06/2009 14/18
Thomas Lauf, MPE / MPI Halbleiterlabor<br />
08/06/2009 15/18<br />
Measurements & Results<br />
• Linearity measurements<br />
Measurements from 100 eV to 10 keV<br />
Scanning detector surface with monoenergetic beam<br />
• Charge collection measurements<br />
Scanning 3x3 pixel patch with 100 μm beam<br />
Step width 50 μm<br />
961 single measurements for whole scan
Thomas Lauf, MPE / MPI Halbleiterlabor<br />
08/06/2009 16/18<br />
Measurements & Results<br />
Pixel Scans<br />
Relative Count Maps<br />
E = 5 keV<br />
Singles<br />
Doubles<br />
Scan Pos Y [mm]<br />
Relative Counts<br />
Scan Pos X [mm]
Thomas Lauf, MPE / MPI Halbleiterlabor<br />
08/06/2009 17/18<br />
Measurements & Results<br />
Pixel Scans<br />
Average Charge Maps<br />
E = 5 keV<br />
Singles<br />
5100<br />
Doubles<br />
5100<br />
0.8<br />
5000 0.8<br />
5000<br />
Scan Pos Y [mm]<br />
0.6<br />
0.4<br />
0.2<br />
0<br />
-0.2<br />
4900<br />
0.6<br />
4800<br />
4700 0.4<br />
4600 0.2<br />
4500<br />
0<br />
4400<br />
4300 -0.2<br />
4900<br />
4800<br />
4700<br />
4600<br />
4500<br />
4400<br />
4300<br />
Charge [eV]<br />
-0.4<br />
4200<br />
-0.4<br />
4100<br />
4200<br />
4100<br />
-0.2 0 0.2 0.4 0.6 0.8 1 1.2<br />
-0.2 0 0.2 0.4 0.6 0.8 1 1.2<br />
Scan Pos X [mm]
Thomas Lauf, MPE / MPI Halbleiterlabor<br />
08/06/2009 18/18<br />
Conclusions & Outlook<br />
• Macropixels matrix showed excellent linear response<br />
• Gain is very homogeneous over matrix<br />
• No charge loss within pixel area detected in selected<br />
patch<br />
• Will use detector for XRF experiment at ELETTRA (Triest)<br />
• Continue analysis <strong>of</strong> measurement data<br />
• Derive quantum efficiency<br />
• Exp<strong>and</strong> range to higher energies
SDS 2009<br />
Thank you for your attention!
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