High-field spatial imaging of charge transport in silicon at low temperature

C. Stanford; R. A. Moffatt; N. A. Kurinsky; P. L. Brink; B. Cabrera; M. Cherry; F. Insulla; M. Kelsey; F. Ponce; K. Sundqvist; S. Yellin; B. A. Young

doi:10.1063/1.5131171

journal article·2020-02-01Open access

High-field spatial imaging of charge transport in silicon at low temperature

C. Stanford, R. A. Moffatt, N. A. Kurinsky, P. L. Brink, B. Cabrera, M. Cherry, F. Insulla, M. Kelsey, F. Ponce, K. Sundqvist, S. Yellin, B. A. Young

AIP Advances· Volume 10· Issue 2

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Abstract

We present direct imaging measurements of charge transport across a 1 cm × 1 cm × 4 mm-thick crystal of high purity silicon (∼15 kΩ-cm) at temperatures of 5 K and 500 mK. We use these data to measure lateral diffusion of electrons and holes as a function of the electric field applied along the [111] crystal axis and to verify our low-temperature Monte Carlo software. The range of field strengths in this paper exceed those used in our previous study [R. A. Moffatt et al., Appl. Phys. Lett. 114, 032104 (2019)] by a factor of 10 and now encompass the region in which some recent silicon dark matter detectors operate [R. Agnese et al., Phys. Rev. Lett. 121, 051301 (2018)]. We also report on a phenomenon of surface charge trapping, which can reduce expected charge collection.

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Research context

OpenAlex topics: Dark Matter and Cosmic Phenomena · Particle Detector Development and Performance · Radiation Detection and Scintillator Technologies

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Physics, Stanford University 1 , Stanford, California 94305, USA

Fermi National Accelerator Laboratory, Center for Particle Astrophysics 2 , Batavia, Illinois 60510, USA

Kavli Institute for Cosmological Physics, University of Chicago 3 , Chicago, Illinois 60637, USA

SLAC National Accelerator Laboratory/Kavli Institute for Particle Astrophysics and Cosmology 4 , 2575 Sand Hill Road, Menlo Park, California 94025, USA

Department of Physics, San Diego State University 5 , San Diego, California 92182, USA

Department of Physics, Santa Clara University 6 , Santa Clara, California 95053, USA

Funding

National Science Foundation · U.S. Department of Energy · Fermilab

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