Low-cost fabrication of high efficiency solid-state neutron detectors

Jia-Woei Wu; Kuan-Chih Huang; Adam Weltz; Erik English; Mona M. Hella; Rajendra Dahal; James J.-Q. Lu; Yaron Danon; Ishwara B. Bhat

doi:10.1117/12.2224050

12 May 2016 Low-cost fabrication of high efficiency solid-state neutron detectors

Jia-Woei Wu, Kuan-Chih Huang, Adam Weltz, Erik English, Mona M. Hella, Rajendra Dahal, James J.-Q. Lu, Yaron Danon, Ishwara B. Bhat

Author Affiliations +

Proceedings Volume 9824, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XVII; 982414 (2016) https://doi.org/10.1117/12.2224050
Event: SPIE Defense + Security, 2016, Baltimore, MD, United States

Abstract

The development of high-efficiency solid state thermal neutron detectors at low cost is critical for a wide range of civilian and defense applications. The use of present neutron detector system for personal radiation detection is limited by the cost, size, weight and power requirements. Chip scale solid state neutron detectors based on silicon technology would provide significant benefits in terms of cost, volume, and allow for wafer level integration with charge preamplifiers and readout electronics. In this paper, anisotropic wet etching of (110) silicon wafers was used to replace deep reactive ion etching (DRIE) to produce microstructured neutron detectors with lower cost and compatibility with mass production. Deep trenches were etched by 30 wt% KOH at 85°C with a highest etch ratio of (110) to (111). A trench-microstructure thermal neutron detector described by the aforementioned processes was fabricated and characterized. The detector—which has a continuous p⁺-n junction diode—was filled with enriched boron (99% of ¹⁰B) as a neutron converter material. The device showed a leakage current of ~ 6.7 × 10^-6 A/cm² at -1V and thermal neutron detection efficiency of ~16.3%. The detector uses custom built charge pre-amplifier, a shaping amplifier, and an analogto- digital converter (ADC) for data acquisition.

Citation Download Citation

Jia-Woei Wu, Kuan-Chih Huang, Adam Weltz, Erik English, Mona M. Hella, Rajendra Dahal, James J.-Q. Lu, Yaron Danon, and Ishwara B. Bhat "Low-cost fabrication of high efficiency solid-state neutron detectors", Proc. SPIE 9824, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XVII, 982414 (12 May 2016); https://doi.org/10.1117/12.2224050

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