Gate Dielectric Composition for Smoother Semiconductor I-V Curves

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Solution Overview

Problem

Semiconductor devices with double-hump current-voltage characteristics experience noise issues due to non-uniform electric field distribution, leading to electromagnetic interference, radio frequency interference, and unpredictable performance.

Innovation Solution

A gate dielectric with varying composition across the channel region, adjusting work function and dielectric permittivity to smooth the current-voltage relationship by compensating for non-uniform electric fields.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If a uniform gate dielectric is used, then the device structure is simple, but non-uniform electric field distribution causes double-hump current-voltage characteristics and noise issues

Engineering Contradiction:

Improvegate dielectric structureVSAvoidcurrent-voltage characteristic stability

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The gate dielectric is designed with spatially varying composition: a first dielectric material with higher permittivity is positioned over the center portion of the channel, while a second dielectric material with lower permittivity is positioned over the end portions. This local differentiation compensates for non-uniform electric field distribution, eliminating double-hump characteristics and reducing noise without requiring complete structural redesign

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The gate dielectric employs a composite structure combining two different dielectric materials with distinct permittivity values. The first dielectric material (higher permittivity) and second dielectric material (lower permittivity) are arranged in specific patterns across the channel width, creating a composite dielectric system that optimizes electric field distribution and current-voltage characteristics

Inventive Principle:

Principle #40Composite materials

2Object-affected harmful factors

If the gate dielectric composition is varied to smooth current-voltage relationship, then noise interference is reduced, but the manufacturing process becomes more complex

Engineering Contradiction:

Improveelectromagnetic interference and radio frequency interferenceVSAvoidgate dielectric formation process

Core Design Contradiction:

Object-affected harmful factorsVSEase of manufacture

Solution Approach 1:

The gate dielectric formation process is segmented into distinct deposition steps: first dielectric material is deposited over the center portion of the channel, then the second dielectric material is deposited over the end portions. This segmentation allows precise spatial control of material composition and permittivity distribution, enabling noise reduction through controlled electric field uniformity while maintaining manufacturing feasibility

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The dielectric permittivity parameter is deliberately varied across the gate dielectric structure by selecting materials with different permittivity values and positioning them strategically. This parameter change compensates for electric field non-uniformity, eliminating double-hump characteristics and reducing electromagnetic and radio frequency interference

Inventive Principle:

Principle #35Parameter changes

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

Eliminates double-hump features, reducing noise-related interference and improving device reliability by stabilizing current-voltage profiles.

Implementation Method 1

Methodology Applied

Scientific EffectDielectric permittivity: Dielectric Permittivity

Implementation Method 2

compensating for non-uniform electric fields

Methodology Applied

Scientific EffectElectric field: Electric Field

Data Source

PatentUS20260047175A1Semiconductor devices having improved current/voltage characteristics and methods of forming the same

Publication Date: 2026.02.12 TAIWAN SEMICONDUCTOR MANUFACTURING CO LTD

AI summary

A semiconductor device includes a substrate, a source region, a drain region, and a channel region separating the source region from the drain region, each formed in the substrate and displaced from one another along a first direction. The semiconductor device includes a gate dielectric formed over the channel region that includes a first dielectric material, having a first dielectric permittivity, located over a center portion of the channel region and a second dielectric material, having a second permittivity that is less than the first dielectric permittivity, located over a first end and a second end of the channel region that are separated from one another by the center portion along a second direction that is perpendicular to the first direction. The semiconductor device further includes an isolation structure, having a first portion and a second portion located on opposite sides of the channel region along the second direction.