TG2Overview Purifica1onofenrichedGe CrystalgrowingatIKZ - - PowerPoint PPT Presentation

TG‐2
Overview


• Purifica1on
of
enriched
Ge

• Crystal
growing
at
IKZ

• BEGe
effort
(see
talks
by
Stefan,
Dusan)

• SiPM
Lar
readout
(J.
Janicsko)


PPM
–
1me
schedule
defined
 for
purifica1on
of
enrGe


! !

Zeitplan

MPI München - Umarbeitung enriched GeO2 in Ge poly > 50 !cm Reduktion: Start jeweils gegen 10 Uhr mit 5,6 kg GeO2, Dauer 44 h 1 09.03.10 2 15.03.10 3 17.03.10 4 22.03.10 5 24.03.10 6 29.03.10 7 06.04.10 8 12.04.10 9 14.04.10 10 19.04.10 Zonenreinigung:

• ca. 8 kg Ge, Dauer 24 h

Erster Durchgang jeweils mit 2 Reduktionschargen, weitere Durchgänge nach Bedarf Abschluss der Arbeiten spätestens 30.04.10

Have
offer
from
PPM:
final
issue


regarding
insurance
s1ll
being
 clarified
 Have
offer
from
Weltkulturerbe
 Rammelsberg
for
storage
of
 material
underground.
 Josef
Janicsko
will
handle
all
 transports/bookkeeping.

On‐site
 at
PPM.


IKZ


• since
last
mee1ng,
two
new
xtals
grown
in
mini‐CZ
puller
(converted


float‐zone
puller).

Total
now
17
xtals
pulled.


Ø
49.7


Electrical characterization of the Ge crystal Ge-HP-17 (miniCZ-3) CZ17 Starting material Susceptor Crucible Atmosphere Furnace FZ-1605 PPM (76Ge-depleted Ge) 1.312 kg TCM (Ta alloyed Mo) suprasil 2nd experiment Ar 6.0 + 4% H2 6.0 Conductivity and Hall effect results: Resistvity (Ω Ω Ω Ωcm) carrier concentration (cm-3) Mobility (cm2/Vs) Temperature RT 77 K RT 77 K RT 77 K CZ17_B 56 77

• 9.5×1013

+2.0× × × ×1012 1170 41100 CZ17_D2 52 754

• 7.8×1013

+1.9× × × ×1011 1540 43400 CZ17_F1-2-3 inhomogeneous: 77-K measurements impossible!! 52-56

• 7.6-8.3

×1013

• 1430-

1570

• An additional set of samples will be prepared from the crystal between the D and E
• positions. Results are expected in January.

IKZ / QG Charakterisierung

• 2/3 -

21.12.2009 Irmscher / Pietsch

CZ17 - PTIS

40 60 80 100 120 140 160

• 1.5
• 1.0
• 0.5

0.0 0.5 1.0 6 8 10 12 14 16 18

As

CZ17_A at 7 K CZ17_A at 7 K + light

PTIS signal (normalized) Energy (cm-1) Al P Energy (meV)

40 60 80 100 120 140 160

• 1.5
• 1.0
• 0.5

0.0 0.5 1.0 6 8 10 12 14 16 18

As CZ17_C2 at 7 K CZ17_C2 at 7 K + light PTIS signal (normalized) Energy (cm-1) Al P Energy (meV)

Impurities Aluminum dominates over the sum of phosphorus and arsenic. This is consistent with the p-type conductivity observed in the neighboring samples B and D2. The arsenic concentration is only 10...15% of that of phosphorus. Whether we have really a reduction of the impurities in the crystal going from A to C, as indicated by the Hall measurements, cannot be answered firmly. A change of the compensation ratio is also possible.

!"#$%#!$ &'(()*'+,-..'/0(

12+3.(+,4/56,7)5(5.36*82+92892,:7;<,62'+3/2628(+

12=5/(,58,7)5(5.36*82+92892,62'+3/2628(+,54,()2,45..5>*8?,+'6=.2+@,+28(,AB,C/#,

• A/5+*65D,4/56,EFG,:'//*D20,58,%!#!%#$"<H

I'6=.2,8'62 C2+9/*=(*58 J2KLM!NO I'6=.2,82'/,()2,+220,54,()2,9/B+('.,KLM!N J2KLM!NC I'6=.2,54,6*00.2,54,()2,9/B+('.,KLM!N J2KLM!NP I'6=.2,82'/,()2,('*.,54,()2,9/B+('.,KLM!N O245/2,=2/45/6*8?,62'+3/2628(+,'..,+'6=.2+,)'D2,A228,=5.*+)20,'80,2(9)20,!,6*8,*8, K7Q,+5.3(*58#

!QR$ !N$$ !N%$ !NS$ !NQ$ $ %$$$ S$$$ Q$$$ R$$$ !$$$$ !%$$$ NS$ NTU NT$ N%U N%$ N!U N!$ N$U

,J2KL!NO ,J2KL!NC ,J2KL!NP OV

W7:7X-+<

PV

YZ

V[C

Y-

PV

Y-

V[C

;-

PV

;-

*8(28+*(B,:'/A#,38*(+< >'D2.28?(),:86< 282/?B,:62\< ,

!"#$%&'()!7;,+=29(/',54,+'6=.2+,4/56,J2KLM!N,'(,Y]S#%,F'>*(),2^9*('(*58,AB,-/?58,.'+2/,>*(), 7]!$$,6_,'80,',+=29(/'.,/2+5.3(*58,54,$#",86

!"#$"%#&'()"*"+,)"-.)/+(0"12"+,)"3#22)()$+"-04.5)-"5116"7'#+)"-#4#50("8'+"#$"+,)"-))3")$3"

• 04.5)"519)("5'4#$)-/)$/)"#$+)$-#+:

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

*>D? *>DE *>?@ *>?* @ *@@ =@@ F@@ G@@ H@@ >@@ D@@ DFE DF?;H DF? DFD;H

IJ

KLMLN

#$+)$-#+:"M0(8;"'$#+-N 90O)5)$&+,"M$4N "P)QR*DI "P)QR*DS "P)QR*D% )$)(&:"M4)TN "

'()&%*+,-!U#&,"()-15'+#1$"LV"-.)/+('4"12"+,)"P)W*D"-04.5)-"0+"XYG;="Z+9#+,")C/#+0+#1$"8:" [(&1$"50-)("9#+,"LYH@@"4\"0$3"0"-.)/+(05"()-15'+#1$"12"@;>"$4

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

• Next
steps
at
IKZ:


– New
crystal
from
rebuilt
CZ
puller
 (electropolished)
expected
this
week
 – New
crystal
from
new
modified
float‐zone
puller
 (only
used
for
ultra‐high
purity,
no
doping)
also
 expected
this
week
 – Results
within
1
week
??


• Beyond
the
diodes:

• Electronics

• Cabling

• Lock
requirements

• DAQ
requirements

• MC
simula1ons

• We
need
to
be
ac1ve
on
developing
these


items
for
Phase
II
as
we
start
up
Phase
I