Polycrystalline mercuric iodide films: Deposition, properties, and detector performance

U. N. Roy; Y. Cui; G. Wright; C. Barnett; A. Burger; L. A. Franks; Z. W. Bell

doi:10.1109/TNS.2002.801516

Polycrystalline mercuric iodide films: Deposition, properties, and detector performance

U. N. Roy, Y. Cui, G. Wright, C. Barnett, A. Burger, L. A. Franks, Z. W. Bell

Research output: Contribution to journal › Article › peer-review

11 Scopus citations

Abstract

We report the room-temperature α-particle response of a detector fabricated from high-purity polycrystalline mercuric iodide thin films. The films are deposited by physical vapor technique using multipassed zone refined high-purity starting material. Films approximately 15 μm thick were deposited on indium-tin-oxide (ITO) coated glass substrate and were shown to be reasonably compact and have uniform surface morphology by cross-sectional scanning electron microscopy study. Photoluminescence at 10 K showed two distinct peaks at 533 nm and around 560 nm. A previously reported peak at ∼620 nm, mainly attributed to the presence of impurities, was not present. Room-temperature α-particle response measurements were carried out under vacuum and demonstrated that efficient charge collection can be obtained with thin polycrystalline HgI₂. We have demonstrated that a full energy peak is developed, although first indications are that the performance is significantly poorer than a silicon charged particle detector. Charge collection was found to improve with voltage, as expected.

Original language	English
Pages (from-to)	1965-1967
Number of pages	3
Journal	IEEE Transactions on Nuclear Science
Volume	49 I
Issue number	4
DOIs	https://doi.org/10.1109/TNS.2002.801516
State	Published - Aug 2002
Externally published	Yes

Funding

Manuscript received March 12, 2002; revised May 10, 2002. This work was supported by the National Aeronautics and Space Administration through the Center for Photonic Materials and Devices, Fisk University, under Grants NCC8-133, NCC8-145, and NCC5-286, and by the U.S. Department of Energy under Contract DE-AC05-00OR22800 (Y-12 National Security Complex). U. N. Roy, Y. Cui, G. Wright, C. Barnett, and A. Burger are with the Center for Photonic Materials and Devices, Fisk University, Nashville, TN 37208 USA (e-mail: [email protected]). L. A. Franks is at 311 Piedmont Rd., Santa Barbara, CA 93105 USA. Z. W. Bell is with the Y-12 National Security Complex, Oak Ridge, TN 37831 USA (e-mail: [email protected]). Digital Object Identifier 10.1109/TNS.2002.801516

Funders	Funder number
Fisk University	NCC8-133, NCC8-145, NCC5-286
U.S. Department of Energy	DE-AC05-00OR22800
National Aeronautics and Space Administration

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abstract = "We report the room-temperature α-particle response of a detector fabricated from high-purity polycrystalline mercuric iodide thin films. The films are deposited by physical vapor technique using multipassed zone refined high-purity starting material. Films approximately 15 μm thick were deposited on indium-tin-oxide (ITO) coated glass substrate and were shown to be reasonably compact and have uniform surface morphology by cross-sectional scanning electron microscopy study. Photoluminescence at 10 K showed two distinct peaks at 533 nm and around 560 nm. A previously reported peak at ∼620 nm, mainly attributed to the presence of impurities, was not present. Room-temperature α-particle response measurements were carried out under vacuum and demonstrated that efficient charge collection can be obtained with thin polycrystalline HgI2. We have demonstrated that a full energy peak is developed, although first indications are that the performance is significantly poorer than a silicon charged particle detector. Charge collection was found to improve with voltage, as expected.",

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T2 - Deposition, properties, and detector performance

AU - Roy, U. N.

AU - Cui, Y.

AU - Wright, G.

AU - Barnett, C.

AU - Burger, A.

AU - Franks, L. A.

AU - Bell, Z. W.

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N2 - We report the room-temperature α-particle response of a detector fabricated from high-purity polycrystalline mercuric iodide thin films. The films are deposited by physical vapor technique using multipassed zone refined high-purity starting material. Films approximately 15 μm thick were deposited on indium-tin-oxide (ITO) coated glass substrate and were shown to be reasonably compact and have uniform surface morphology by cross-sectional scanning electron microscopy study. Photoluminescence at 10 K showed two distinct peaks at 533 nm and around 560 nm. A previously reported peak at ∼620 nm, mainly attributed to the presence of impurities, was not present. Room-temperature α-particle response measurements were carried out under vacuum and demonstrated that efficient charge collection can be obtained with thin polycrystalline HgI2. We have demonstrated that a full energy peak is developed, although first indications are that the performance is significantly poorer than a silicon charged particle detector. Charge collection was found to improve with voltage, as expected.

AB - We report the room-temperature α-particle response of a detector fabricated from high-purity polycrystalline mercuric iodide thin films. The films are deposited by physical vapor technique using multipassed zone refined high-purity starting material. Films approximately 15 μm thick were deposited on indium-tin-oxide (ITO) coated glass substrate and were shown to be reasonably compact and have uniform surface morphology by cross-sectional scanning electron microscopy study. Photoluminescence at 10 K showed two distinct peaks at 533 nm and around 560 nm. A previously reported peak at ∼620 nm, mainly attributed to the presence of impurities, was not present. Room-temperature α-particle response measurements were carried out under vacuum and demonstrated that efficient charge collection can be obtained with thin polycrystalline HgI2. We have demonstrated that a full energy peak is developed, although first indications are that the performance is significantly poorer than a silicon charged particle detector. Charge collection was found to improve with voltage, as expected.

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JO - IEEE Transactions on Nuclear Science

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Polycrystalline mercuric iodide films: Deposition, properties, and detector performance

Abstract

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