Three-Electrode Probe for Semiconductor Transistor Characterization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for measuring transistor characteristics of semiconductor materials are limited, as they either require extensive processing to produce source, drain, and gate electrodes or cannot probe the influence of gate voltage effectively, lacking a straightforward technique for unprocessed materials.
Innovation Solution
A measurement device with three electrodes - a first and second electrode spaced apart and a third electrode isolated by insulators, which replicates the gate structure and source/drain electrodes of a transistor, allowing direct measurement of transistor characteristics without processing the material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If source/drain/gate electrodes are produced on the sample to enable full transistor behavior study, then complete information on electronic characteristics is obtained, but extensive processing effort is required and the material is altered from its pristine state
Solution Approach 1:
The patent introduces a probe device as an intermediary that temporarily contacts the sample surface to form transistor structures during measurement. This mediator enables complete transistor characteristic measurement without permanently altering the sample, resolving the contradiction between obtaining complete electronic characteristics data and maintaining processing simplicity.
Solution Approach 2:
The probe device creates a temporary copy of the transistor structure (source/drain/gate electrodes) on the sample surface only during measurement. This copying approach allows full transistor behavior study without permanent processing, enabling complete electronic characteristics data while avoiding extensive processing effort.
2Measurement precision
If source/drain/gate electrodes are produced on the sample, then transistor characteristics can be measured, but the processing alters the material being studied
Solution Approach 1:
The probe device serves as a non-permanent intermediary that forms transient electrode contacts on the sample surface. This allows transistor characteristics measurement while preserving the material's pristine state, as the electrodes are not permanently produced but temporarily formed during measurement.
Solution Approach 2:
The electrode structure is made dynamic rather than static - it is formed temporarily during measurement and removed afterward. This dynamic approach allows transistor characteristics measurement capability while maintaining material integrity, as the processing is reversible and non-permanent.
3Measurement precision
If conventional methods like 4-point probe or Hall effect are used, then resistivity and carrier mobility can be determined, but full transistor behavior and gate voltage influence cannot be probed
Solution Approach 1:
The probe device integrates multiple functions into a single tool: it can form source/drain electrodes, gate electrodes, and perform electrical measurements all through one device structure. This multi-functionality enables complete transistor behavior study including gate voltage influence, overcoming the limitations of conventional single-function methods.
Solution Approach 2:
The patent merges the functions of separate measurement tools (4-point probe for resistivity, Hall effect for mobility, and gate voltage application) into a single integrated probe device. This combining approach provides complete transistor characteristics measurement capability while managing device complexity through unified design.
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
Enables the determination of transistor characteristics such as carrier mobility, subthreshold swing, and threshold voltage in a straightforward manner, without the need for extensive processing, by creating a transistor structure on the semiconductor surface.
Implementation Method 1
A first and second electrode, distanced apart from each other and configured to be in physical contact with the surface of the sample when the device is placed thereon
Implementation Method 2
A third electrode, at least a portion of which is located in the area between the first and second electrode... One or more first insulators configured to electrically isolate the third electrode from said first and second electrodes
Implementation Method 3
The first and second electrode, and the third electrode or said portion thereof are arranged colinearly
Data Source
AI summary
A device is provided for electrically measuring surface characteristics of a sample. The device comprises at least one group of three electrodes: a first and second electrode spaced apart from each other and configured to be placed onto the surface of the sample, and a third electrode between the first two but isolated from these two electrodes by a one or more first insulators, wherein a second insulator further isolates the central electrode from the sample when the device is placed thereon. The three electrodes and the insulators are attached to a single or to multiple holders with conductors incorporated therein for allowing the coupling of the electrodes to power sources or measurement tools. The placement of the device onto a semiconductor sample creates a transistor with the sample surface acting as the channel. The device thereby allows the determination of the transistor characteristics of the sample in a straightforward way.