Neutron Detector Space Charge Zone Positioning
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Solution Overview
Problem
Existing neutron detectors suffer from instability and signal degradation over time due to polarization, which complicates discrimination between neutrons and gamma particles and reduces their reliability in harsh environments.
Innovation Solution
A method for producing a neutron detector with a simulated space charge zone and neutron conversion layer configuration that eliminates the need for polarization by ensuring the space charge zone extends from the p-n junction interface without defect peaks, using a substrate with a p-n junction formed by doping species like boron isotope 10, optimizing the depth and concentration of doping species to maximize ionization rate and signal quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If polarization is applied to improve signal quality, then signal quality is improved, but device complexity increases and reliability decreases
Solution Approach 1:
The invention extracts and eliminates the polarization requirement from the detector system. By repositioning the space charge zone to extend from the p-n junction interface into the n-doped layer away from defect peaks, the detector achieves stable operation without needing external polarization, thus improving reliability while maintaining signal quality
Solution Approach 2:
The invention changes the spatial parameter of the space charge zone position. By adjusting the zone to extend from the p-n junction interface into the n-doped layer at a depth less than the defect peak depth, the detector achieves optimal performance without polarization, resolving the contradiction between signal quality and stability
2Measurement precision
If polarization is applied to improve signal quality, then signal quality is improved, but device complexity increases
Solution Approach 1:
The invention removes the polarization component from the detector system by redesigning the space charge zone configuration. The zone is positioned to extend from the p-n junction interface into the n-doped layer, eliminating the need for polarization circuits and reducing overall device complexity while maintaining signal quality
3Ease of manufacture
If the space charge zone includes defect peaks, then manufacturing is simpler, but measurement precision decreases
Solution Approach 1:
The invention changes the depth parameter of the space charge zone positioning. By setting the zone to extend into the n-doped layer to a depth less than the defect peak depth, the detector achieves high measurement precision while maintaining straightforward manufacturing through controlled doping profiles
Data Source
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AI summary
The present invention relates to a method for producing a device for detecting a flux of neutrons the parameters of which are comprised in predetermined ranges, characterised in that it comprises at least: one phase of determining parameters, comprising the following steps: - simulating the penetration of a flux of incident neutrons the parameters of which are comprised in said predetermined ranges through a modelled stack comprising in succession and in order at least: one first electrode (601); one substrate comprising: a first layer (100); and a second layer (400); and one second electrode (602); and - simulating at least one defect peak (801, 802) created in the first layer (100) by the vacancies and/or the ionisation of the particles generated by collisions between the neutrons of the flux of incident neutrons and the atoms of the second dopant species; and identifying the depth of the defect peak (801) closest the interface between the first and second layers (100, 400) of the modelled stack.