FET Semiconductor Coating Control for Stable Driving Current
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Solution Overview
Problem
Existing methods for producing field-effect transistors (FETs) face challenges in stabilizing driving current values due to variations in channel length, channel width, and gate insulating layer thickness, which are not adequately addressed by current techniques.
Innovation Solution
A method involving the measurement and adjustment of physical quantities such as channel width, channel length, and gate insulating layer thickness to optimize the coating quantity of semiconductor material, ensuring consistent driving current values across FETs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional FET production methods are used, then production process is simpler, but driving current value varies significantly
Solution Approach 1:
The patent applies preliminary action by measuring physical quantities (channel length, channel width, gate insulating layer thickness) before forming the semiconductor layer, and adjusting the coating quantity accordingly in advance. This pre-adjustment approach ensures that driving current values remain stable without requiring complex post-production corrections or additional process steps.
Solution Approach 2:
The patent implements feedback control by using measured physical quantities from the gate electrode structure to dynamically adjust the semiconductor material coating quantity. This closed-loop approach ensures that variations in underlying structures are compensated for, maintaining consistent driving current values across different FETs while adapting to actual manufacturing variations.
2Reliability
If physical quantity measurement and adjustment is implemented, then driving current value stability improves, but production time increases
Solution Approach 1:
The patent performs measurements and adjustments at the earliest possible stage - before semiconductor layer formation - when the gate electrode and gate insulating layer structures are already in place. This timing allows for quick adjustments without delaying subsequent production steps, minimizing the actual time added to the manufacturing process.
Solution Approach 2:
The patent replaces complex mechanical or chemical adjustment methods with a straightforward measurement-and-adjust-coating-quantity approach. By using physical quantity measurements to directly control coating parameters, the system achieves precise driving current stabilization through simple, fast adjustments rather than complex process modifications.
3Manufacturing precision
If coating quantity is adjusted based on physical quantities, then manufacturing precision improves, but measurement and control complexity increases
Solution Approach 1:
The patent uses feedback control where physical quantity measurements of the gate electrode structure (channel length, channel width, gate insulating layer thickness) directly inform the semiconductor material coating quantity adjustment. This straightforward feedback loop achieves high manufacturing precision by compensating for variations in the underlying structures without requiring complex multi-parameter control systems.
Solution Approach 2:
The patent achieves manufacturing precision by changing the coating quantity parameter of the semiconductor material based on measured physical quantities. This single-parameter adjustment approach simplifies the control system compared to attempting to control multiple dimensions of the semiconductor layer, while still achieving the desired precision in channel dimensions and driving current consistency.
Data Source
Figure 1A~1A(1f)
Figure 1B
Figure 2~2(2f)
AI summary
An object of the present invention is to provide an FET the characteristic variation of which is inhibited, and to produce such an FET using an easy and convenient producing method. The spirit of the present invention is that a physical quantity is measured on the basis of that/those one or more of a gate electrode, a gate insulating layer, a source electrode, and a drain electrode which is/are provided on a substrate, and that a semiconductor layer is formed, wherein to form the semiconductor layer, a semiconductor material is applied in the coating quantity determined on the basis of the physical quantity.