| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Alpha particle detector with planar double Schottky contacts directly fabricated on semi-insulating GaN:Fe template |
| Qun-Si Yang(羊群思)1,2, Qing Liu(刘清)1,2, Dong Zhou(周东)1,2, Wei-Zong Xu(徐尉宗)1,2, Yi-Wang Wang(王宜望)1,2, Fang-Fang Ren(任芳芳)1,2, and Hai Lu(陆海)1,2,† |
1 Jiangsu Provincial Key Laboratory of Advanced Photonic and Electronic Materials, Nanjing University, Nanjing 210093, China;
2 School of Electronic Science and Engineering, Nanjing University, Nanjing 210093, China |
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Abstract Alpha particle radiation detectors with planar double Schottky contacts (DSC) are directly fabricated on 5-μm-thick epitaxial semi-insulating (SI) GaN:Fe film with resistivity higher than 1×108Ω·cm. Under 10 V bias, the detector exhibits a low dark current of less than 5.0×10-11 A at room-temperature, which increases at higher temperatures. Linear behavior in the semi-log reverse current-voltage plot suggests that Poole-Frenkel emission is the dominant carrier leakage mechanism at high bias. Distinct double-peak characteristics are observed in the energy spectrum of alpha particles regardless of bias voltage. The energy resolution of the SI-GaN based detector is determined to be ～ 8.6% at the deposited energy of 1.209 MeV with a charge collection efficiency of ～ 81.7%. At a higher temperature of 90 ℃, the measured full width at half maximum (FWHM) rises to 235 keV with no shift of energy peak position, which proves that the GaN detector has potential to work stably in high temperature environment. This study provides a possible route to fabricate the low cost GaN-based alpha particle detector with reasonable performance.
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Received: 19 January 2021
Revised: 14 April 2021
Accepted manuscript online: 10 May 2021
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PACS:
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73.40.Sx
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(Metal-semiconductor-metal structures)
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73.40.Cg
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(Contact resistance, contact potential)
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29.40.Wk
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(Solid-state detectors)
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29.30.Kv
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(X- and γ-ray spectroscopy)
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| Fund: Project supported by the Natural Science Foundation of Jiangsu Province, China (Grant Nos. BK20190302 and BK20201253). |
Corresponding Authors:
Hai Lu
E-mail: hailu@nju.edu.cn
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Cite this article:
Qun-Si Yang(羊群思), Qing Liu(刘清), Dong Zhou(周东), Wei-Zong Xu(徐尉宗), Yi-Wang Wang(王宜望), Fang-Fang Ren(任芳芳), and Hai Lu(陆海) Alpha particle detector with planar double Schottky contacts directly fabricated on semi-insulating GaN:Fe template 2021 Chin. Phys. B 30 117303
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