Self-biased boron-10 coated high-purity epitaxial GaAs thermal neutron detectors

2000 ◽  
Vol 47 (4) ◽  
pp. 1364-1370 ◽  
Author(s):  
D.S. McGregor ◽  
S.M. Vernon ◽  
H.K. Gersch ◽  
S.M. Markham ◽  
S.J. Wojtczuk ◽  
...  
Keyword(s):  
Thermal Neutron ◽  
High Purity ◽  
Neutron Detectors ◽  
Epitaxial Gaas

Electrophoretic Deposition of 10B Nano/Micro Particles in Deep Silicon Trenches for the Fabrication of Solid State Thermal Neutron Detectors

2018 ◽  
Vol 27 (01n02) ◽  
pp. 1840002 ◽  
Author(s):  
Machhindra Koirala ◽  
Jia Woei Wu ◽  
Adam Weltz ◽  
Rajendra Dahal ◽  
Yaron Danon ◽  
...  
Keyword(s):  
Solid State ◽  
Thermal Neutron ◽  
Electrophoretic Deposition ◽  
Detection Efficiency ◽  
Chemical Vapor ◽  
Cost Effective ◽  
Deposition Process ◽  
Neutron Detectors ◽  
Micro Particles ◽  
Silicon Trenches

We present a cost effective and scalable approach to fabricate solid state thermal neutron detectors. Electrophoretic deposition technique is used to fill deep silicon trenches with 10B nanoparticles instead of conventional chemical vapor deposition process. Deep silicon trenches with width of 5-6 μm and depth of 60-65 μm were fabricated in a p-type Si (110) wafer using wet chemical etching method instead of DRIE method. These silicon trenches were converted into continuous p-n junction by the standard phosphorus diffusion process. 10B micro/nano particle suspension in ethyl alcohol was used for electrophoretic deposition of particles in deep trenches and iodine was used to change the zeta potential of the particles. The measured effective boron nanoparticles density inside the trenches was estimated to be 0.7 gm cm-3. Under the self-biased condition, the fabricated device showed the intrinsic thermal neutron detection efficiency of 20.9% for a 2.5 × 2.5 mm2 device area.

Identification of residual donors in high-purity epitaxial GaAs with the use of magneto-optical spectroscopy

1983 ◽  
Vol 28 (6) ◽  
pp. 3300-3305 ◽  
Author(s):  
D. C. Reynolds ◽  
K. K. Bajaj ◽  
C. W. Litton ◽  
E. B. Smith
Keyword(s):  
Optical Spectroscopy ◽  
High Purity ◽  
Epitaxial Gaas

Performance of 5-μm PIN diamond diodes as thermal neutron detectors

2020 ◽  
Vol 961 ◽  
pp. 163601 ◽  
Author(s):  
Jason Holmes ◽  
Jesse Brown ◽  
Franz A. Koeck ◽  
Holly Johnson ◽  
Manpuneet K. Benipal ◽  
...  
Keyword(s):  
Thermal Neutron ◽  
Neutron Detectors

scholarly journals Large High-Efficiency Thermal Neutron Detectors Based on the Micromegas Technology

Universe ◽  
2018 ◽  
Vol 4 (12) ◽  
pp. 134 ◽  
Author(s):  
Georgios Tsiledakis ◽  
Alain Delbart ◽  
Daniel Desforge ◽  
Ioanis Giomataris ◽  
Thomas Papaevangelou ◽  
...  
Keyword(s):  
Thermal Neutron ◽  
Large Scale ◽  
High Efficiency ◽  
Detection Efficiency ◽  
Rate Capability ◽  
High Rate ◽  
Thermal Neutrons ◽  
Neutron Detectors ◽  
Electron Multiplier ◽  
Detection Techniques

Due to the so-called 3He shortage crisis, many detection techniques for thermal neutrons are currently based on alternative converters. There are several possible ways of increasing the detection efficiency for thermal neutrons using the solid neutron-to-charge converters 10B or 10B4C. Here, we present an investigation of the Micromegas technology. The micro-pattern gaseous detector Micromegas was developed in the past years at Saclay and is now used in a wide variety of neutron experiments due to its combination of high accuracy, high rate capability, excellent timing properties, and robustness. A large high-efficiency Micromegas-based neutron detector is proposed for thermal neutron detection, containing several layers of 10B4C coatings that are mounted inside the gas volume. The principle and the fabrication of a single detector unit prototype with overall dimension of ~15 × 15 cm2 and its possibility to modify the number of 10B4C neutron converter layers are described. We also report results from measurements that are verified by simulations, demonstrating that typically five 10B4C layers of 1–2 μm thickness would lead to a detection efficiency of 20% for thermal neutrons and a spatial resolution of sub-mm. The high potential of this novel technique is given by the design being easily adapted to large sizes by constructing a mosaic of several such detector units, resulting in a large area coverage and high detection efficiencies. An alternative way of achieving this is to use a multi-layered Micromegas that is equipped with two-side 10B4C-coated gas electron multiplier (GEM)-type meshes, resulting in a robust and large surface detector. Another innovative and very promising concept for cost-effective, high-efficiency, large-scale neutron detectors is by stacking 10B4C-coated microbulk Micromegas. A prototype was designed and built, and the tests so far look very encouraging.

Donor Magnetospectroscopy in high purity epitaxial GaAs

1969 ◽  
Vol 7 (11) ◽  
pp. xvi-xvii
Author(s):  
G.E. Stillman ◽  
C.M. Wolfe ◽  
J.O. Dimmock
Keyword(s):  
High Purity ◽  
Epitaxial Gaas
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