SiGe Etch Pre-treatment Passivation Layer
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Solution Overview
Problem
As semiconductor devices approach scaling limits, existing technologies face challenges in selectively etching silicon germanium (SiGe) while minimizing damage to adjacent silicon oxide layers, leading to inefficiencies and defects in the fabrication process.
Innovation Solution
A pre-treatment composition comprising an acid, an alcohol, and a silane compound is applied to form a passivation layer on the silicon oxide layer, which reduces reactivity with subsequent SiGe etching compositions, allowing for selective etching of SiGe while protecting the silicon oxide layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional etching processes are used to remove SiGe, then SiGe can be removed, but the silicon oxide layer suffers from etching damage and defects
Solution Approach 1:
A pre-treatment composition is applied to the silicon oxide layer before the SiGe etching process. This pre-treatment forms a protective modification on the silicon oxide surface that prevents etching damage during subsequent SiGe removal, while not interfering with the etching selectivity
Solution Approach 2:
The pre-treatment composition acts as an intermediary substance between the SiGe etchant and the silicon oxide layer. It modifies the silicon oxide surface properties to create a protective barrier that mediates the interaction between the etchant and the oxide, preventing harmful effects while maintaining etching effectiveness
2Object-affected harmful factors
If the silicon oxide layer is protected from etching, then etching damage is reduced, but the fabrication process becomes more complex
Solution Approach 1:
The pre-treatment step is combined with the existing fabrication process flow, integrating the protective function into the standard process sequence. The pre-treatment composition is applied as a additional step before etching, merging the protection function with the existing etching process rather than requiring separate complex protection and removal steps
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 pre-treatment composition effectively reduces etching damage to silicon oxide layers and minimizes defects, enabling selective removal of SiGe while maintaining the integrity of the silicon oxide layer, thereby improving the reliability and performance of semiconductor devices.
Implementation Method 1
a silane compound of the following Formula 1: R—Si(R1)n(OR2)3-n
Implementation Method 2
supplying a pre-treatment composition according to an embodiment to form a passivation layer on the insulation pattern
Data Source
AI summary
A pre-treatment composition for use before etching SiGe includes an acid, an alcohol, and a silane compound having a chemical formula R—Si(R1)n(OR2)3-n in which R is (C3-C20)alkyl, (C6-C12)aryl, (C6-C12)aryl(C3-C20)alkyl, or (C3-C20)alkyl(C6-C12)aryl, R1 is hydrogen, hydroxyl, halogen, (C1-C20)alkyl, halo(C1-C20)alkyl, (C6-C12)aryl, (C6-C12)aryl(C1-C20)alkyl, or (C1-C20)alkyl(C6-C12)aryl, R2 is hydrogen, (C1-C20)alkyl, halo(C1-C20)alkyl, (C6-C12)aryl, (C6-C12)aryl(C1-C20)alkyl, or (C1-C20)alkyl(C6-C12)aryl, n is an integer of 0 to 2, and the alkyl, aryl, arylalkyl, or alkylaryl of R, and the alkyl, haloalkyl, aryl, arylalkyl, or alkylaryl of R1 may be further substituted with at least one substituent selected from halogen, hydroxyl, —N(R11)(R12), and —S(R13), where each of the R11, the R12 and the R13 is independently hydrogen or (C1-C20)alkyl.