Protective Polymer Layer for Semiconductor Wet Processing
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Solution Overview
Problem
As semiconductor devices shrink in size, the process windows for photolithographic processing become tighter, necessitating advances to maintain the ability to scale down components and meet design criteria, with a focus on improved gap filling and reduced damage to semiconductor features during wet processing operations.
Innovation Solution
The use of a protective layer, such as bottom anti-reflective coatings or spin-on carbon coatings, combined with specific photoresist compositions and exposure techniques, enhances gap filling and reduces damage to semiconductor device features during wet processing, improving yield and reducing defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If photolithographic processing is used to pattern semiconductor devices, then manufacturing capability is enabled, but process windows become tighter as device size decreases
Solution Approach 1:
A protective layer is introduced as an intermediary between the photoresist pattern and the underlying semiconductor features. This protective layer acts as a mediator that absorbs mechanical stress and prevents direct contact between the patterned photoresist and the semiconductor features, thereby reducing damage during wet processing operations while enabling continued scaling to smaller device dimensions
Solution Approach 2:
The protective layer is formed using a composite material system comprising a polymer matrix with specific repeating units that provide both mechanical protection and chemical resistance. The composite structure combines the photoresist material with the protective layer material to create a multi-functional coating system that simultaneously enables patterning and protects underlying features
2Productivity
If photolithographic processing is used to pattern semiconductor devices, then manufacturing capability is enabled, but damage to semiconductor features during wet processing increases
Solution Approach 1:
The protective layer is applied beforehand to the semiconductor features before photolithographic patterning. This pre-applied protective coating acts as a cushion that absorbs mechanical stress and prevents direct damage to the semiconductor features during subsequent wet processing operations such as etching and cleaning, thereby reducing harmful effects while maintaining manufacturing productivity
Solution Approach 2:
The protective layer serves as an intermediary barrier between the photoresist pattern and the semiconductor features. This intermediate layer protects the semiconductor features from direct exposure to harmful chemicals and mechanical stress during wet processing, enabling high-yield manufacturing of scaled devices
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 method provides improved gap filling, reduced damage, and enhanced semiconductor device yield by utilizing protective layers and optimized photoresist compositions to withstand wet processing operations effectively.
Implementation Method 1
heating the protective layer at a temperature ranging from 200° C. to 400° C.
Implementation Method 2
exposed to an energy that has itself been patterned. Such an exposure modifies the chemical and physical properties of the exposed regions of the photosensitive material
Data Source
AI summary
Method of manufacturing a semiconductor device, includes forming a protective layer over substrate having a plurality of protrusions and recesses. The protective layer includes polymer composition including polymer having repeating units of one or more of:Wherein a, b, c, d, e, f, g, h, and i are each independently H, —OH, —ROH, —R(OH)2, —NH2, —NHR, —NR2, —SH, —RSH, or —R(SH)2, wherein at least one of a, b, c, d, e, f, g, h, and i on each repeating unit is not H. R, R1, and R2 are each independently a C1-C10 alkyl group, a C3-C10 cycloalkyl group, a C1-C10 hydroxyalkyl group, a C2-C10 alkoxy group, a C2-C10 alkoxy alkyl group, a C2-C10 acetyl group, a C3-C10 acetylalkyl group, a C1-C10 carboxyl group, a C2-C10 alkyl carboxyl group, or a C4-C10 cycloalkyl carboxyl group, and n is 2-1000. A resist layer is formed over the protective layer, and the resist layer is patterned.