Protective Film Composition for Semiconductor Wet Etching
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Solution Overview
Problem
Current protective films used in semiconductor manufacturing lack sufficient chemical resistance, particularly against ammonia hydrogen peroxide solutions, which can lead to increased current leakage and power consumption due to thinner gate insulating films.
Innovation Solution
A protective film-forming composition comprising a compound with specific structural units, a thermal acid generator or curing agent, and a solvent, which forms a film with enhanced chemical resistance and optical properties, excluding polymers and novolak resins, and is applied as a resist underlayer film to improve dry etching selectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional protective films are used, then the process is simple, but the chemical resistance to ammonia hydrogen peroxide solution is insufficient
Solution Approach 1:
The patent changes the chemical composition parameters by specifying a compound with terminal group (A1), multivalent group (A2), and linking group (A3) where the terminal group contains specific functional groups (hydroxyl, carboxyl, or amine groups). This parameter change in molecular structure provides enhanced chemical resistance to ammonia hydrogen peroxide solution while maintaining manageable composition complexity through defined structural constraints.
Solution Approach 2:
The patent creates a composite protective film system by combining a specifically structured compound (A) with a solvent (B) and optional additives. This composite approach, where the compound contains terminal groups bonded to multivalent groups through linking groups, achieves superior chemical resistance compared to conventional single-material protective films.
2Length of moving object
If the gate insulating film is made thinner, then the device size is reduced, but the current leakage increases
Solution Approach 1:
The patent introduces a protective film as an intermediary layer between the gate insulating film and the etching environment. This protective film, formed from the specifically structured compound with terminal and multivalent groups, acts as a mediator that prevents direct contact between the ammonia hydrogen peroxide solution and the thin gate insulating film, thereby preventing current leakage while allowing the gate insulating film to remain thin for device miniaturization.
3Reliability
If a protective film is formed to resist wet etching, then the chemical resistance is improved, but the dry etching selectivity may be affected
Solution Approach 1:
The patent applies local quality by designing a compound where terminal groups (A1) with specific functional groups (hydroxyl, carboxyl, or amine) are bonded to multivalent groups (A2) through linking groups (A3). This creates regions of different chemical properties within the protective film - the terminal groups provide chemical resistance to wet etching while the overall molecular structure and linking groups maintain appropriate etching selectivity for dry etching processes, allowing both requirements to be satisfied simultaneously.
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 composition forms a protective film with high chemical resistance and desirable dry etching selectivity, effectively addressing the limitations of existing films by providing improved resistance to ammonia hydrogen peroxide solutions and maintaining good optical parameters.
Implementation Method 1
a thermal acid generator (B-1) and/or a curing agent (B-2)
Implementation Method 2
a compound having no repeating structural unit, which contains a terminal group (A1), a multivalent group (A2), and a linking group (A3)
Data Source
AI summary
A protection film formation composition for a wet-etching solution for semiconductors, the protection film formation composition including: (A) a compound having no repeating structural unit and contains a terminal group (A1), a polyvalent group (A2) and a linking group (A3). Terminal group (A1) binds only to linking group (A3), polyvalent group (A2) binds only to linking group (A3), linking group (A3) binds to terminal group (A1) at one terminal and to polyvalent group (A2) at the other terminal and optionally binds to another linking group (A3), terminal group (A1) is represented by formula (I), polyvalent group (A2) represents a group having a valency of 2 to 4; and linking group (A3) represents an aromatic hydrocarbon group; (B) a thermoacid generator (B-1) and/or a curing agent (B-2); and (C) a solvent.