High-k Gate Dipole Treatment for Precise Transistor Vt Tuning
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
As the minimum feature sizes in semiconductor devices are reduced, challenges arise in effectively tuning the threshold voltages (Vts) of transistors, which affects the performance and integration density of these devices.
Innovation Solution
A method involving the deposition of a dipole film, its trimming to reduce thickness, and a treatment process using a nitrogen (N2) and hydrogen (H2) gas mixture to enhance the dipole drive-in process, thereby effectively tuning the threshold voltages of transistors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If minimum feature sizes are reduced to improve integration density, then more components can be integrated into a given area, but threshold voltage tuning becomes less effective
Solution Approach 1:
The patent changes the chemical parameters of the dipole film by using nitrogen and hydrogen treatment to modify the film's properties. This allows effective threshold voltage tuning even at reduced feature sizes by altering the dipole film's composition and interaction with the high-k dielectric layer, thereby resolving the contradiction between miniaturization and tuning effectiveness
Solution Approach 2:
The dipole film acts as an intermediary layer between the gate electrode and the high-k dielectric. By treating this intermediary layer with nitrogen and hydrogen, the patent enhances its ability to mediate threshold voltage control, enabling precise tuning despite smaller device dimensions and maintaining manufacturing precision while improving integration density
2Manufacturing precision
If dipole film thickness is reduced to improve Vt tuning precision, then threshold voltage control is enhanced, but dipole doping efficiency decreases
Solution Approach 1:
The patent applies nitrogen and hydrogen treatment to change the chemical parameters of the dipole film, which compensates for the reduced thickness. This treatment modifies the film's properties to enhance dipole doping efficiency even when the film is thinner, thereby achieving both precise Vt tuning and maintained doping efficiency
Solution Approach 2:
The treated dipole film creates a composite structure with enhanced properties. The nitrogen and hydrogen treatment introduces new chemical characteristics that improve the film's doping efficiency despite reduced thickness, effectively combining the benefits of thin-film precision with enhanced doping performance
3Productivity
If thermal processes are applied to enhance dipole drive-in, then doping effectiveness improves, but adverse thermal effects increase
Solution Approach 1:
The nitrogen and hydrogen treatment modifies the dipole film as an intermediary to enhance dopant release and drive-in without requiring excessive thermal energy. This treated intermediate layer facilitates more effective doping at lower temperatures, improving drive-in effectiveness while reducing harmful thermal effects on the device structure
Solution Approach 2:
The patent partially replaces thermal mechanisms with chemical mechanisms through nitrogen and hydrogen treatment. This chemical preparation of the dipole film enables effective drive-in with reduced thermal input, substituting some thermal action with chemically-enhanced dopant release and transport
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 proposed method improves the efficiency of dipole doping, allowing for more precise tuning of threshold voltages, which enhances the performance and integration density of semiconductor devices.
Implementation Method 1
The treatment may break the bonds of dipole atoms from their compounds
Implementation Method 2
The treatment may break the bonds of dipole atoms from their compounds, and may reduce the adverse effect caused by thermal processes
Implementation Method 3
performing a drive-in process to drive a dipole dopant from the dipole film into the high-k dielectric layer
Data Source
AI summary
A method forming a source/drain region based on a first portion of a semiconductor region, forming a high-k dielectric layer based on a second portion of the semiconductor region, forming a dipole film on the high-k dielectric layer, performing a treatment process on the dipole film using a process gas comprising nitrogen and hydrogen, performing a drive-in process to drive a dipole dopant in the dipole film into the high-k dielectric layer, and depositing a work-function layer on the high-k dielectric layer.