Hydroxybenzophenone Stabilizers for Unsaturated Hydrocarbon Precursors

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Solution Overview

Problem

Unsaturated hydrocarbon-based precursors like 2,5-Norbornadiene (NBDE) and isoprene used in microelectronics are thermally unstable, leading to rapid polymerization and degradation, which causes issues in processing and film quality due to the formation of oligomers, and their instability results in premature precipitation when exposed to polar liquids, affecting tool operation and film quality.

Innovation Solution

The use of hydroxybenzophenone and nitroxyl radical-based stabilizers is introduced to slow down the polymerization of NBDE and isoprene, minimizing oligomer formation and precipitation when contacted with polar liquids, thereby enhancing their stability and viability as precursors for low dielectric constant films.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If unsaturated hydrocarbon-based precursors (NBDE, isoprene) are used for depositing low k films, then the dielectric constant is reduced, but the precursors undergo rapid polymerization and degradation at ambient temperature

Engineering Contradiction:

Improvestability of precursorVSAvoidcompositional stability of precursor

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

A stabilizer compound is introduced as an intermediary substance that mediates between the unsaturated hydrocarbon precursor and the polymerization reaction. The stabilizer preferentially reacts with free radicals or initiates alternative reaction pathways, preventing the precursor from undergoing unwanted polymerization while allowing the desired deposition process to proceed.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The chemical environment parameters are changed by adding the stabilizer compound, which alters the reaction kinetics and thermodynamics of the precursor. This changes the stability parameters of the precursor system, reducing the rate of polymerization and degradation reactions while maintaining the precursor's functionality for film deposition.

Inventive Principle:

Principle #35Parameter changes

2Duration of action of stationary object

If stabilizers are added to prevent polymerization, then the shelf-life is extended, but the processing complexity increases

Engineering Contradiction:

Improveshelf-life of precursorVSAvoidprocessing complexity

Core Design Contradiction:

Duration of action of stationary objectVSDevice complexity

Solution Approach 1:

The stabilizer is used in small quantities (low concentration) and acts as a consumable protective agent that is gradually consumed during storage and processing. This disposable approach allows extended shelf-life without requiring complex processing equipment or procedures, as the stabilizer simply needs to be mixed into the precursor solution.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Ease of operation

If precursors are stored at ambient temperature, then the handling is simplified, but the polymerization rate increases

Engineering Contradiction:

Improvehandling ease of precursorVSAvoiddegradation rate

Core Design Contradiction:

Ease of operationVSProductivity

Solution Approach 1:

The stabilizer acts as an intermediary that enables ambient temperature storage by intercepting the polymerization initiation steps. This mediator allows the precursor to be handled at convenient temperatures without requiring refrigeration or special temperature control infrastructure.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 stabilizers significantly reduce the degradation rate of NBDE and isoprene, extending their shelf-life and ensuring consistent film quality by preventing premature oligomer formation and precipitation, thus making them more suitable for manufacturing environments.

Implementation Method 1

slow down the polymerization of NBDE and isoprene, minimizing oligomer formation

Methodology Applied

Scientific EffectPolymerization:

Implementation Method 2

minimizing oligomer formation and precipitation when contacted with polar liquids

Methodology Applied

Scientific EffectPrecipitation: Precipitation

Data Source

PatentUS8092709B2Stabilizers for the stabilization of unsaturated hydrocarbon-based precursor

Publication Date: 2012.01.10 VERSUM MATERIALS US LLC

AI summary

A stabilized composition consists essentially of unsaturated hydrocarbon-based materials, and a stabilizer selected from the group consisting of a hydroxybenzophenone and a nitroxyl radical based stabilizer. A method for stabilizing unsaturated hydrocarbon-based precursor material against the polymerization comprises providing a stabilizer selected from the group consisting of a hydroxybenzophenone and a nitroxyl radical based stabilizer.