Thin Anti-Reflective Layer for Stray Radiation Absorption
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Solution Overview
Problem
Conventional semiconductor devices suffer from stray radiation due to physical gaps and unwanted diffraction, which degrades their optical performance, as existing methods are inadequate to effectively absorb or redirect such radiation.
Innovation Solution
The implementation of thin anti-reflective layers with a higher refractive index than the substrate surfaces, formed outwardly from support structures and dielectric layers, to absorb stray radiation and mitigate its effects, while also providing protection against corrosion and electrical shorts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional methods are used to reduce stray radiation, then some radiation may be redirected, but the methods are limited and ineffective for various reasons
Solution Approach 1:
An anti-reflective layer is introduced as an intermediary between the substrate and the incident radiation. This layer has a refractive index intermediate between air and the substrate material, allowing it to absorb and reduce stray radiation that would otherwise reflect off the substrate surface and degrade optical performance.
Solution Approach 2:
The patent changes the optical parameters of the substrate surface by coating it with an anti-reflective layer having a specific refractive index. This parameter change (refractive index matching) enables effective reduction of stray radiation reflection, thereby improving optical performance and system reliability.
2Object-affected harmful factors
If thin anti-reflective layers are used to absorb stray radiation, then optical performance is enhanced, but the layer thickness must be precisely controlled
Solution Approach 1:
The patent specifies that the anti-reflective layer thickness should be between 1-100 nanometers, with optimal thickness being one-quarter of the wavelength of incident light. This precise parameter specification enables effective stray radiation absorption while providing clear manufacturing guidelines for achieving the required thickness control.
3Object-affected harmful factors
If the anti-reflective layer has a higher refractive index than the substrate, then stray radiation is effectively absorbed, but the layer must be formed with specific optical properties
Solution Approach 1:
The patent specifies that the anti-reflective layer should have a refractive index higher than the substrate material. This parameter specification enables effective stray radiation absorption by creating the appropriate optical impedance mismatch, while providing clear guidance for material selection and deposition process control.
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 use of thin anti-reflective layers effectively reduces stray radiation, enhances optical performance, and minimizes process perturbations, allowing for the use of more reflective materials and reducing the risk of corrosion and electrical shorts in semiconductor devices.
Implementation Method 1
The first outer sidewall surface has a first minimum refractive index. The anti-reflective layer has: a second refractive index that is greater than the first minimum refractive index
Data Source
AI summary
In accordance with the teachings of the present disclosure, methods and apparatus are provided for a semiconductor device having thin anti-reflective layer(s) operable to absorb radiation that may otherwise reflect off surfaces disposed inwardly from the anti-reflective layer(s). In a method embodiment, a method for manufacturing a semiconductor device includes forming a support structure outwardly from a substrate. The support structure has a first thickness and a first outer sidewall surface that is not parallel with the substrate. The first outer sidewall surface has a first minimum refractive index. The method further includes forming an anti-reflective layer outwardly from the first outer sidewall surface. The anti-reflective layer has: a second outer sidewall surface that is not parallel with the substrate, a second refractive index that is greater than the first minimum refractive index, and a second thickness that is less than the first thickness.