Adaptive Superstrate Thickness for Planarization Conformity
Solution Overview
Problem
Existing technologies face challenges in forming adaptive planarization layers over substrates with non-uniform topography, as they struggle to achieve both conformal behavior on a larger scale and planarization on a smaller scale effectively, leading to difficulties in maintaining uniformity and pattern integrity during reverse tone etching processes.
Innovation Solution
A superstrate with a body having a specific thickness range (t1=(Pd4/2Eh)1/3 to t2=(5Pd4/2Eh)1/3) is designed, where P is the pressure from capillary and gas forces, E is Young's modulus, and h is the step height difference, allowing for conformal behavior on longer lengths and planarization on shorter lengths, using materials like glass or polyethylene with appropriate thicknesses for optimal performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a thick superstrate is used to ensure planarity, then planarization is improved, but conformal behavior and out-of-plane displacement are worsened
Solution Approach 1:
The patent applies parameter changes by precisely controlling the superstrate thickness within the specific range of t1 to t2, where t1=(Pd4/2Eh)1/3 and t2=(5Pd4/2Eh)1/3. This thickness parameter is optimized to balance the conflicting requirements: thick enough to provide planarity but thin enough to maintain conformal behavior and allow sufficient out-of-plane displacement for adaptive planarization.
2Shape
If a thin superstrate is used to maintain conformal behavior, then out-of-plane displacement is improved, but planarization is worsened
Solution Approach 1:
The patent resolves this contradiction by establishing a minimum thickness threshold t1=(Pd4/2Eh)1/3 that ensures sufficient planarization capability while allowing the superstrate to remain thin enough for conformal behavior. The thickness is carefully tuned to be greater than this minimum to achieve planarity but not so thick as to compromise conformality.
3Stability of the object's composition
If the superstrate is made rigid to ensure stability, then structural stability is improved, but bending distance and adaptability are worsened
Solution Approach 1:
The patent applies parameter changes by selecting an appropriate Young's modulus E for the superstrate material and controlling thickness within the optimized range. This balance ensures the superstrate has sufficient rigidity for stability during processing while maintaining enough flexibility to bend and adapt to the substrate topography, achieving both stability and adaptability.
Solution Approach 2:
The patent may employ composite material structures for the superstrate, combining materials with different mechanical properties to achieve the optimal balance between rigidity for stability and flexibility for bending. This allows the superstrate to be stable during handling and processing while capable of adapting to substrate variations.
4Manufacturing precision
If the superstrate thickness is increased to reduce out-of-plane displacement, then planarization precision is improved, but manufacturing complexity and material requirements are worsened
Solution Approach 1:
The patent resolves this by providing a specific thickness range t1 to t2 derived from the formula involving pressure P, bending distance d, Young's modulus E, and step height h. This formulaic approach simplifies manufacturing by giving a clear target range rather than requiring complex control mechanisms, making the manufacturing process more straightforward while achieving precise out-of-plane displacement 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 superstrate achieves effective conformal and planarization behavior, ensuring maximum out-of-plane displacement for conformal behavior is sufficient and within thresholds for planarization, resulting in a uniform adaptive planarization layer that maintains pattern integrity and facilitates efficient reverse tone etching.
Implementation Method 1
P is a pressure corresponding to a sum of contributions from a capillary force between the body and formable precursor material
Implementation Method 2
P is a pressure corresponding to sum of contributions from a capillary force between the body and formable precursor material, and a gas pressure applied to the superstrate
Implementation Method 3
polymerizing the planarization precursor material to form a planarization layer over the substrate
Data Source
AI summary
A body of a superstrate can be used to form an adaptive planarization layer over a substrate that has a non-uniform topography. A body of a superstrate can have bending characteristics that are well suited to achieve both conformal and planarization behavior. The body can have a surface and a thickness in a range of t1 to t2, t1=(Pd4/2Eh)1/3; t2=(5Pd4/2Eh)1/3; P is a pressure corresponding to a capillary force between the body and a planarization precursor material; d is a bending distance; E is Young's modulus for the body; and h is a step height difference between two adjacent regions of a substrate. In an embodiment, a thickness can be selected and used to determine the maximum out-of-plane displacement, wmax, for conformal behavior is sufficient and that wmax for planarization behavior is below a predetermined threshold.