Nanopillar Arrays Enhance Electron Emission Yield
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Solution Overview
Problem
Thin semiconductor membranes used in electron multiplier devices experience a significant reduction in secondary electron emission when thinned to micron or submicron scales, making it impractical to achieve high gain functionality, which is essential for various detector applications.
Innovation Solution
Nano-structured semiconductor membrane structures with arrays of nanopillars are developed to enhance secondary electron emission and field emission, allowing for the creation of electron sources, amplifiers, filters, and detectors that can modulate electron intensities and energies, and provide a 'window' for different operating conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If thin semiconductor membranes are thinned to micron or submicron scales, then the membrane provides better window functionality and separation capability, but secondary electron emission is substantially reduced
Solution Approach 1:
The semiconductor membrane is segmented into an array of nanopillars with dimensions of 1-1000 nanometers. This segmentation increases the surface area-to-volume ratio and creates multiple emission sites, thereby maintaining high secondary electron emission yield even when the overall membrane thickness is reduced to micron or submicron scales for window functionality.
Solution Approach 2:
The invention transitions from a two-dimensional planar membrane structure to a three-dimensional nanopillar array structure. By adding the vertical dimension with nanopillars extending from the membrane surface, the effective emission area is dramatically increased without proportionally increasing the membrane footprint, thus maintaining electron emission performance while enabling thin-film window applications.
2Ease of manufacture
If common semiconductors are used in membrane configuration, then fabrication is simplified, but SEE yield is below three making high gain impractical
Solution Approach 1:
The invention changes the geometric parameters of the semiconductor structure by creating nanopillars with specific dimensions (1-1000 nm) rather than using a planar membrane. This parameter change transforms the emission characteristics, enabling common semiconductors to achieve SEE yields greater than three and实现 high gain functionality while maintaining ease of fabrication through established semiconductor processing techniques.
Solution Approach 2:
The invention creates a composite structure combining the semiconductor membrane material with a nanopillar geometric configuration. This composite approach leverages the favorable fabrication properties of common semiconductors while the nanopillar morphology provides enhanced electron emission characteristics, achieving both ease of manufacture and high gain functionality.
3Reliability
If nanopillar arrays are implemented, then secondary electron emission and field emission are enhanced, but device complexity increases
Solution Approach 1:
The nanopillar array structure is designed to be self-forming through self-organized growth processes or self-aligned fabrication techniques. The semiconductor material itself forms the nanopillar structure through controlled deposition or etching processes, eliminating the need for separate complex assembly steps and reducing overall device fabrication complexity while maintaining enhanced electron emission performance.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The nano-structured semiconductor membranes achieve a gain of up to 10^5, enabling efficient electron amplification, filtering, and detection, while maintaining stability and flexibility across different operating conditions.
Implementation Method 1
Secondary electron emission in these systems can be significantly enhanced using field emission (FE), wherein an electrical bias is provided to the system to facilitate extraction of the SEE generated
Implementation Method 2
incident primary electrons pass a 'window' component of the device and scatter with a detector material capable of inducing a cascade of secondary electrons
Data Source
AI summary
The present invention provides systems, devices, device components and structures for modulating the intensity and/or energies of electrons, including a beam of incident electrons. In some embodiments, for example, the present invention provides nano-structured semiconductor membrane structures capable of generating secondary electron emission. Nano-structured semiconductor membranes of this aspect of the present invention include membranes having an array of nanopillar structures capable of providing electron emission for amplification, filtering and/or detection of incident radiation, for example secondary electron emission and/or field emission. Nano-structured semiconductor membranes of the present invention are useful as converters wherein interaction of incident primary electrons and nanopillars of the nanopillar array generates secondary emission. Nano-structured semiconductor membranes of this aspect of the present invention are also useful as directed charge amplifiers wherein secondary emission from a nanopillar array provides gain functionality for increasing the intensity of radiation comprising incident electrons.