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Title: Transient current induced in thin film diamonds by swift heavy ions

Single crystal diamond is a suitable material for the next generation particle detectors because of the superior electrical properties and the high radiation tolerance. In order to investigate charge transport properties of diamond particle detectors, transient currents generated in diamonds by single swift heavy ions (26 MeV O 5 + and 45 MeV Si 7 +) are investigated. We also measured two dimensional maps of transient currents by single ion hits. In the case of 50 μm-thick diamond, both the signal height and the collected charge are reduced by the subsequent ion hits and the charge collection time is extended. Our results are thought to be attributable to the polarization effect in diamond and it appears only when the transient current is dominated by hole current. In the case of 6 μm-thick diamond membrane, an “island” structure is found in the 2D map of transient currents. Signals in the islands shows different applied bias dependence from signals in other regions, indicating different crystal and/or metal contact quality. Simulation study of transient currents based on the Shockley-Ramo theorem clarifies that accumulation of space charges changes distribution of electric field in diamond and causes the polarization effect.
Authors:
ORCiD logo [1] ;  [1] ;  [1] ;  [1] ;  [2] ;  [2] ; ORCiD logo [3] ;  [3] ;  [4] ;  [5]
  1. National Inst. for Quantum and Radiological Science and Technology (QST), Takasaki (Japan). Quantum Beam Science Research Directorate (QuBS)
  2. Gunma Univ. (Japan). Division of Electronics and Informatics
  3. Ruder Boskovic Inst. (RBI), Zagreb (Croatia). Division of Experimental Physics
  4. Alternative Energies and Atomic Energy Commission (CEA), Gif-sur-Yvette (France). Diamond Sensors Lab.
  5. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Publication Date:
Report Number(s):
SAND2016-11010J
Journal ID: ISSN 0925-9635; 648758; TRN: US1702856
Grant/Contract Number:
AC04-94AL85000
Type:
Accepted Manuscript
Journal Name:
Diamond and Related Materials
Additional Journal Information:
Journal Volume: 75; Journal Issue: C; Journal ID: ISSN 0925-9635
Publisher:
Elsevier
Research Org:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; diamond crystal; radiation induced effects; detectors; membranes
OSTI Identifier:
1399888
Alternate Identifier(s):
OSTI ID: 1420190