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
 enr Ge
 ! ! Zeitplan MPI München - Umarbeitung enriched GeO 2 in Ge poly > 50 ! cm Reduktion: Start jeweils gegen 10 Uhr mit 5,6 kg GeO 2 , Dauer 44 h Have 
offer
from
PPM:
final
issue
 1 09.03.10 2 15.03.10 regarding
insurance
s1ll
being
 3 17.03.10 clarified
 4 22.03.10 5 24.03.10 6 29.03.10 Have
offer
from
Weltkulturerbe
 7 06.04.10 8 12.04.10 Rammelsberg
for
storage
of
 9 14.04.10 material
underground.
 10 19.04.10 Zonenreinigung: ca. 8 kg Ge, Dauer 24 h Josef
Janicsko
will
handle
all
 Erster Durchgang jeweils mit 2 Reduktionschargen, transports/bookkeeping.

On‐site
 weitere Durchgänge nach Bedarf at
PPM.
 Abschluss der Arbeiten spätestens 30.04.10

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 PPM ( 76 Ge-depleted Ge) Furnace TCM (Ta suprasil Ar 6.0 + FZ-1605 1.312 kg alloyed Mo) 2nd experiment 4% H 2 6.0 Conductivity and Hall effect results: Resistvity carrier concentration Mobility (cm -3 ) (cm 2 /Vs) ( Ω Ω cm) Ω Ω Temperature RT 77 K RT 77 K RT 77 K -9.5 × 10 13 × 10 12 CZ17_B 56 77 1170 41100 +2.0 × × × -7.8 × 10 13 × 10 11 CZ17_D2 52 754 1540 43400 +1.9 × × × CZ17_F1-2-3 52-56 -- -7.6-8.3 -- 1430- -- × 10 13 inhomogeneous: 1570 77-K measurements impossible!! An additional set of samples will be prepared from the crystal between the D and E positions. Results are expected in January.

CZ17 - PTIS Energy (meV) 6 8 10 12 14 16 18 1.0 P PTIS signal (normalized) 0.5 As 0.0 Al -0.5 CZ17_A at 7 K CZ17_A at 7 K + light -1.0 -1.5 40 60 80 100 120 140 160 Energy (cm -1 ) Energy (meV) 6 8 10 12 14 16 18 1.0 P PTIS signal (normalized) 0.5 As 0.0 Al -0.5 -1.0 CZ17_C2 at 7 K CZ17_C2 at 7 K + light -1.5 40 60 80 100 120 140 160 Energy (cm -1 ) 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. IKZ / QG Charakterisierung - 2/3 - 21.12.2009 Irmscher / Pietsch

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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