Backside Bow Compensation Deposition With Station-Level Wafer Control

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Solution Overview

Problem

Existing multi-station semiconductor processing techniques struggle to deposit backside bow compensation layers with different thicknesses and internal stresses on substrates within the same chamber simultaneously, leading to uneven warpage and non-uniform processing results due to lack of station-to-station control of process conditions.

Innovation Solution

Implementing station-to-station control of precursor flow and deposition conditions in a multi-station chamber to concurrently deposit bow compensation layers with varying thicknesses and internal stresses on substrates, adjusting local process parameters such as duration, temperature, and plasma power at each station to compensate for different bow amounts.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If multi-station semiconductor processing techniques are used to deposit backside bow compensation layers, then throughput is improved by processing multiple substrates simultaneously, but manufacturing precision deteriorates due to inability to deposit layers with different thicknesses and internal stresses on different substrates

Engineering Contradiction:

ImprovethroughputVSAvoiduniformity of bow compensation

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

The patent implements independent control of deposition parameters (precursor flow rate, plasma power, temperature, deposition time) at each station, allowing each substrate to receive a customized bow compensation layer with specific thickness and internal stress tailored to its individual bow characteristics, thereby achieving uniform compensation across multiple substrates processed simultaneously

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The system dynamically adjusts deposition parameters at each station based on real-time substrate bow measurements and compensation requirements, enabling flexible control of deposition duration, precursor flow, and plasma conditions to optimize compensation for each substrate while maintaining simultaneous processing

Inventive Principle:

Principle #15Dynamics

2Device complexity

If uniform deposition conditions are applied to all substrates in a multi-station chamber, then device complexity is reduced by simplifying control, but manufacturing precision deteriorates due to inability to compensate for different bow amounts on different substrates

Engineering Contradiction:

Improvecontrol system complexityVSAvoidbow compensation accuracy

Core Design Contradiction:

Device complexityVSManufacturing precision

Solution Approach 1:

The patent changes physical and chemical parameters (precursor flow rate, plasma power, temperature, deposition time) at each station to match the specific bow compensation needs of each substrate, transforming a uniform control system into one that dynamically adjusts parameters based on individual substrate requirements while maintaining manageable system complexity

Inventive Principle:

Principle #35Parameter changes

3Manufacturing precision

If different deposition times are used for different substrates to achieve uniform bow compensation, then manufacturing precision is improved, but productivity deteriorates due to sequential processing requirements

Engineering Contradiction:

Improvebow compensation uniformityVSAvoidprocessing throughput

Core Design Contradiction:

Manufacturing precisionVSProductivity

Solution Approach 1:

The patent segments the deposition process into independent, simultaneously executable operations at multiple stations, each with its own optimized deposition time and parameters, allowing different substrates to receive customized compensation layers at the same time rather than sequentially, thereby maintaining both precision and productivity

Inventive Principle:

Principle #1Segmentation

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

Effectively reduces wafer bow to within specified limits by depositing tailored bow compensation layers, enhancing processing uniformity and reducing non-uniformity across substrates in the same chamber.

Implementation Method 1

concurrently depositing a first bow compensation layer of material on the backside of the first substrate at a first station and a second bow compensation layer of material on the backside of a second substrate at a second station

Methodology Applied

Scientific EffectPhysical Vapour Deposition: Physical Vapour Deposition

Implementation Method 2

Methodology Applied

Scientific EffectChemical Vapour Deposition: Chemical Vapour Deposition

Implementation Method 3

Methodology Applied

Scientific EffectPlasma Enhanced Chemical Vapour Deposition: Plasma Enhanced Chemical Vapour Deposition

Data Source

PatentUS20250246486A1Station-to-station control of backside bow compensation deposition

Publication Date: 2025.07.31 LAM RES CORP

AI summary

Methods for reducing warpage of bowed semiconductor substrates, including providing a first substrate to a first station in a semiconductor processing chamber, providing a second substrate to a second station in the semiconductor processing chamber, concurrently depositing a first bow compensation layer of material on the backside of the first substrate at the first station and a first bow compensation layer of material on the backside of the second substrate at the second station, and depositing a second bow compensation layer of material on the backside of the first substrate, while the first substrate is at the first station and the second substrate is at the second station, and while not concurrently depositing material on the backside of the second substrate.