Space charge polarization in irradiated single crystal CVD diamond

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Naaranoja , T , Golovleva , M , Martikainen , L , Berretti , M & Österberg , K 2019 , ' Space charge polarization in irradiated single crystal CVD diamond ' , Diamond and Related Materials , vol. 96 , pp. 167-175 . https://doi.org/10.1016/j.diamond.2019.03.007

Title: Space charge polarization in irradiated single crystal CVD diamond
Author: Naaranoja, T.; Golovleva, M.; Martikainen, L.; Berretti, M.; Österberg, K.
Contributor organization: Helsinki Institute of Physics
Department of Physics
University Management
Date: 2019-06
Language: eng
Number of pages: 9
Belongs to series: Diamond and Related Materials
ISSN: 0925-9635
DOI: https://doi.org/10.1016/j.diamond.2019.03.007
URI: http://hdl.handle.net/10138/327967
Abstract: Single crystal CVD (scCVD) diamond is an attractive material for particle detection in high energy physics for its good time resolution and reported outstanding radiation tolerance. In addition to direct signal loss via charge carrier trapping, polarization effect, caused by non-homogeneous filling of trap defects, is a known cause of signal degradation in irradiated scCVD diamond. This phenomenon was studied by intentionally polarizing irradiated diamonds. Even the relatively lightly irradiated (1014 protons/cm2) diamonds exhibited strong enough polarization to collapse the electric field with moderate rate of 5 MeV alpha particles. The transient current measurements were reproduced with TCAD simulations. The hypothesis that the polarization is caused by single neutral defect type in the bulk, was tested using two generic models. Neither one has a satisfactory agreement with the measurement data, which indicates that trapping at the interfaces play a significant role in space charge polarization.
Subject: Single crystal diamondradiation induced effects
Electrical properties characterization
Defects
Detectors
Sensors
114 Physical sciences
Peer reviewed: Yes
Rights: cc_by_nc_nd
Usage restriction: openAccess
Self-archived version: acceptedVersion


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