X-ray Induced Electric Currents in Anodized Ta2O5: Towards a Large-Area Thin-Film Sensor

Author:

Brivio Davide12ORCID,Gagne Matt34,Freund Erica3,Sajo Erno34ORCID,Zygmanski Piotr124

Affiliation:

1. Brigham and Women’s Hospital, Boston, MA 02115, USA

2. Harvard Medical School, Boston, MA 02115, USA

3. Department of Physics and Applied Physics, University of Massachusetts Lowell, Lowell, MA 01854, USA

4. RayWatch Inc., Hopkinton, MA 01748, USA

Abstract

Purpose: We investigated the characteristics of radiation-induced current in nano-porous pellet and thin-film anodized tantalum exposed to kVp X-ray beams. We aim at developing a large area (≫cm2) thin-film radiation sensor for medical, national security and space applications. Methods: Large area (few cm2) micro-thin Ta foils were anodized and coated with a counter electrode made of conductive polymer. In addition, several types of commercial electrolytic porous tantalum capacitors were assembled and prepared for irradiation with kVp X-rays. We measured dark current (leakage) as well as transient radiation-induced currents as a function of external voltage bias. Results: Large transient currents (up to 50 nA) under X-ray irradiation (dose rate of about 3 cGy/s) were measured in Ta2O5 capacitors. Small nano-porous Ta and large-area flat Ta foil capacitors show similar current–voltage characteristic curve after accounting for different X-ray attenuation in capacitor geometry. The signal is larger for thicker capacitor oxide. A non-negligible signal for null external voltage bias is observed, which is explained by fast electron production in Ta foils. Conclusions: Anodized tantalum is a promising material for use in large-area, self-powered radiation sensors for X-ray detection and for energy harvesting.

Funder

USAF

DoD SBIR

Publisher

MDPI AG

Reference29 articles.

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3. Faltus, R., Jane, M., and Zednicek, T. (2011). Storage Capacitor Properties and Their Effect on Energy Harvester Performance, KYOCERA AVX. AVX Internal Technical Report.

4. Complex dielectric functions of anodic bi-layer tantalum oxide;Sloppy;Electrochim. Acta,2010

5. Shah, D.R. (2023, December 01). Electrical Characterization of Thin-Film Polymer Tantalum Capacitors. All Theses. 2760. Available online: https://tigerprints.clemson.edu/all_theses/2760.

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