Bulletin of the American Physical Society
APS April Meeting 2019
Volume 64, Number 3
Saturday–Tuesday, April 13–16, 2019; Denver, Colorado
Session R10: WIMP Dark Matter IV
1:30 PM–3:18 PM,
Monday, April 15, 2019
Sheraton
Room: Governor's Square 12
Sponsoring
Unit:
DPF
Chair: Reina Maruyama, Yale University
Abstract: R10.00001 : Purification of Ge ingots for growing crystals in developing dark matter detectors*
1:30 PM–1:42 PM
View Presentation Abstract
Presenter:
Pramod Acharya
(University of South Dakota)
Authors:
Pramod Acharya
(University of South Dakota)
Gang Yang
(University of South Dakota)
Rajendra Panth
(University of South Dakota)
Kyler T Kooi
(University of South Dakota)
Alex Kirkvold
(University of South Dakota)
Yangyang Li
(University of South Dakota)
Dongming Mei
(University of South Dakota)
Collaboration:
PIRE-GEMADARC
High-purity germanium (HPGe) single crystals having the net impurity level of ~ 109 to 1010 cm-3 can be used for the fabrication of high-resolution dark matter detectors. We implement a zone refining technique as a primary purification procedure for growing crystals. The raw germanium ingots in our laboratory have four main impurities, such as Aluminum, Boron, Phosphorous, and Gallium, identified through photothermal ionization spectroscopy (PTIS), with a net impurity level of (1013-1014) cm-3.The process of zone-refining included a two-step strategy, which included initial purification of the raw germanium ingots in a graphite boat, and then further purification of the zone-refined ingots from the first step in a carbon-coated quartz boat. We have optimized the parameter, zone length, zone travel speed and number of passes for impurities ingots having distinguished the segregation coefficient. Using the Van der Pauw Hall method, we were able to measure the electrical properties of zone refined ingots and analyze the distribution of impurities. Results obtained from graphite boat Ingots have the impurity level of (1011-1012) cm-3, and from quartz boat Ingots (1010-1011) cm-3. This work is supported by NSF OISE-1743790 and NSF PHY-1902577.
*NSF OISE-1743790 and NSF PHY-1902577
Follow Us |
Engage
Become an APS Member |
My APS
Renew Membership |
Information for |
About APSThe American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics. |
© 2024 American Physical Society
| All rights reserved | Terms of Use
| Contact Us
Headquarters
1 Physics Ellipse, College Park, MD 20740-3844
(301) 209-3200
Editorial Office
100 Motor Pkwy, Suite 110, Hauppauge, NY 11788
(631) 591-4000
Office of Public Affairs
529 14th St NW, Suite 1050, Washington, D.C. 20045-2001
(202) 662-8700