Gate Electrode Doping for Threshold Voltage Code Differentiation
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Solution Overview
Problem
Current semiconductor devices lack the ability to effectively differentiate between logic values '0' and '1' due to similar threshold voltages in transistors, limiting their capacity to generate unique codes for identification.
Innovation Solution
The semiconductor device incorporates gate electrodes doped with dopants of different conductive types, modifying the threshold voltage of transistors to allow for distinct current measurements, enabling the differentiation between logic values '0' and '1' and generating a code for identification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If transistors use uniform doping in gate electrodes, then manufacturing process is simple, but threshold voltage differentiation is insufficient to distinguish logic values
Solution Approach 1:
The patent applies local quality by doping different portions of gate electrodes with different dopant types (first dopant for first portion, second dopant for second portion). This creates spatial variation in electrical properties within the gate electrode structure, enabling distinct threshold voltages for different transistor regions while maintaining a systematic manufacturing approach through selective area doping processes.
Solution Approach 2:
The gate electrode is segmented into different doped portions (first portion and second portion) with different dopant concentrations or types. This segmentation allows independent control of threshold voltages in different regions, enabling the transistor to produce distinguishable current levels for logic '0' and logic '1' states without requiring completely separate transistor structures.
2Adaptability or versatility
If gate electrodes are doped with different dopant types, then logic values can be differentiated, but manufacturing precision requirements increase
Solution Approach 1:
The patent employs preliminary action by forming a uniform gate electrode structure first, then applying selective doping processes to different portions. This sequence allows the base structure to be established with controlled geometry before introducing dopant variations, thereby managing manufacturing precision requirements through staged processing rather than attempting to achieve precise dopant placement from the outset.
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
This approach allows for the configuration of semiconductor devices to generate a code for identification by modifying the threshold voltage of transistors through doping, enabling the differentiation between logic values '0' and '1' based on current measurements.
Implementation Method 1
The first gate electrode is doped with a first dopant of a first conductive type. The second gate electrode is doped with a second dopant of a second conductive type different from the first conductive type.
Data Source
AI summary
A method of manufacturing a semiconductor device is provided. The semiconductor device includes providing a substrate; forming a plurality of gate electrodes on the substrate; doping a first portion of the plurality of gate electrodes with a first dopant of a first conductive type; and doping a second portion of the plurality of gate electrodes with a second dopant of a second conductive type different from the first conductive type.