Selective Metal Silicide Deposition with Separated Plasma Activation

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Conventional CVD metal silicide deposition processes face issues with corrosive plasma leading to unwanted deposition on chamber walls and particle formation, necessitating frequent hardware servicing.

Innovation Solution

A method is employed where a plasma region and an activation region are separated in a CVD chamber using a dual-channel showerhead, allowing a metal precursor to be introduced in a non-plasma state, mixing with carrier gases in the activation region to form metal silicide without entering the plasma region, thereby reducing corrosive chemistry and particle issues.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If a metal precursor containing plasma is used in conventional CVD deposition, then metal silicide can be deposited on the substrate, but corrosive deposition occurs on chamber walls and particle issues arise

Engineering Contradiction:

Improvemetal silicide depositionVSAvoidcorrosive deposition and particle formation

Core Design Contradiction:

Manufacturing precisionVSObject-generated harmful factors

Solution Approach 1:

The showerhead is divided into two separate channels: a first channel for delivering metal precursor gas and a second channel for delivering carrier gas. This segmentation prevents the metal precursor from being exposed to plasma in the reaction zone, eliminating corrosive chemistry while still enabling metal silicide deposition through controlled gas mixing and thermal activation.

Inventive Principle:

Principle #1Segmentation

2Productivity

If metal precursor plasma is activated in the reaction zone, then deposition can proceed, but hardware requires frequent servicing and cleaning

Engineering Contradiction:

Improvedeposition processVSAvoidchamber downtime for servicing

Core Design Contradiction:

ProductivityVSLoss of time

Solution Approach 1:

The carrier gas is pre-heated in a heated channel before mixing with the metal precursor gas. This preliminary thermal activation allows the metal precursor to be activated without plasma exposure, enabling continuous deposition processes without frequent chamber downtime for cleaning or servicing.

Inventive Principle:

Principle #10Preliminary action

3Productivity

If plasma is used to activate metal precursor, then deposition rate is maintained, but unwanted deposition occurs on chamber walls

Engineering Contradiction:

Improvedeposition rateVSAvoidunwanted deposition on chamber walls

Core Design Contradiction:

ProductivityVSObject-generated harmful factors

Solution Approach 1:

Different regions of the showerhead are assigned different functions: the first channel delivers metal precursor to specific locations, while the second channel delivers heated carrier gas to other locations. This local differentiation ensures activation occurs only where needed, preventing unwanted deposition on chamber walls while maintaining deposition rate on the substrate.

Inventive Principle:

Principle #3Local quality

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 significantly reduces chamber downtime and hardware maintenance by minimizing corrosive deposition and particle formation, enhancing process reliability and efficiency.

Implementation Method 1

creating a plasma comprising a first gas including argon gas and hydrogen gas in a plasma region

Methodology Applied

Scientific EffectPlasma: Plasma

Implementation Method 2

applying RF power to a showerhead or lid heater in a chemical vapor deposition (CVD) chamber

Methodology Applied

Scientific EffectRF power heating: Dielectric Heating

Implementation Method 3

flowing a second gas comprising a metal precursor in a non-plasma state through a plurality of second openings of the showerhead to the activation region, wherein the plurality of second openings are fluidly independent from the plurality of first openings within the showerhead; mixing the first gas with the second gas to activate the second gas in the activation region

Methodology Applied

Scientific EffectChemical vapor deposition: Chemical Vapour Deposition

Data Source

PatentUS12565702B2Method of selective metal deposition using separated reactant activation and plasma discharging zone

Publication Date: 2026.03.03 APPLIED MATERIALS INC

AI summary

Methods of depositing a metal silicide on a substrate are provided herein. In some embodiments, a method of depositing a metal silicide on a substrate having a silicon containing surface includes: creating a plasma comprising a first gas in a plasma region in a chemical vapor deposition (CVD) chamber, wherein the plasma region is disposed between a lid heater and a showerhead; flowing the first gas through a plurality of first openings of the showerhead to an activation region in the CVD chamber disposed between the showerhead and the substrate; flowing a second gas comprising a metal precursor in a non-plasma state through a plurality of second openings of the showerhead to the activation region, wherein the plurality of second openings are fluidly independent from the plurality of first openings within the showerhead; mixing the first gas with the second gas to activate the second gas in the activation region; and exposing the silicon containing surface of the substrate to the activated second gas.