Digital Lithography Pattern Adjustment for Plating Uniformity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Traditional methods for improving plating thickness uniformity on semiconductor substrates using dummy patterns are costly and do not achieve optimal results, as they lack flexibility and require multiple mask sets.
Innovation Solution
A method and apparatus that utilize metrology data to adjust lithographic patterns dynamically, incorporating substrate plating models and digital lithography to optimize dummy patterns and active die orientations for improved electroplating uniformity, allowing real-time feedback and maskless patterning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If dummy patterns are added to improve plating uniformity, then plating thickness uniformity is improved, but manufacturing cost increases due to multiple mask sets
Solution Approach 1:
The patent implements dynamic adjustment of lithographic patterns based on real-time metrology feedback from previous substrates. The pattern generation system continuously adapts dummy pattern placement and active die orientation to optimize plating uniformity for each substrate, replacing static multi-mask approaches with a dynamic, feedback-driven single-mask system.
Solution Approach 2:
The system incorporates metrology measurements of deposited material parameters from previously processed substrates into the pattern generation process. This feedback loop enables the system to learn from previous plating results and adjust subsequent patterns to improve uniformity, eliminating the need for costly multiple mask sets while achieving optimal plating thickness distribution.
2Manufacturing precision
If traditional stepper-based lithography with dummy patterns is used, then plating uniformity is improved, but process complexity and cost increase
Solution Approach 1:
The patent employs a single lithography mask that serves multiple functions: defining active die patterns, generating adaptive dummy patterns for plating uniformity, and accommodating feedback-driven modifications. This universal mask approach replaces the traditional multi-mask system, reducing process complexity while maintaining plating uniformity through intelligent pattern design and real-time adaptation.
Solution Approach 2:
The system dynamically changes lithographic pattern parameters including dummy pattern density, placement, and active die orientation based on metrology feedback. By adjusting these parameters computationally before each substrate processing, the system achieves optimal plating uniformity without requiring complex multi-step lithography processes or multiple physical masks.
3Manufacturing precision
If multiple mask sets are used for dummy patterns, then plating uniformity is improved, but production time and flexibility are reduced
Solution Approach 1:
The system performs preliminary computational analysis of metrology data and generates optimized lithographic patterns with dummy patterns and active die orientations before substrate processing. This pre-computation enables rapid single-mask fabrication and application, eliminating time-consuming multi-mask alignment steps while ensuring optimal plating uniformity through advance pattern design.
Solution Approach 2:
The patent replaces the mechanical multi-mask system with a computational pattern generation approach. Instead of physically creating and aligning multiple masks, the system uses software to design adaptive patterns and implements them on a single mask through digital lithography, dramatically reducing setup time and increasing production flexibility while maintaining plating uniformity.
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
Enhances plating uniformity and reduces costs by eliminating the need for multiple masks, providing rapid learning cycles and high flexibility in pattern adjustments, resulting in improved deposition quality and reduced planarization needs.
Implementation Method 1
using an electroplating process to deposit material on the first substrate
Data Source
AI summary
Methods and apparatus for electroplating a substrate incorporate aspects of digital lithography and feedback from electroplating processes to improve characteristics of plating material based on die patterns. In some embodiments, a method of electroplating a substrate may include receiving a die design, forming a first lithographic pattern for a first substrate based on the die design, using a digital lithography process to pattern the first substrate with the first lithographic pattern, using an electroplating process to deposit material on the first substrate, using a metrology process to determine at least one parameter of the deposited material on the first substrate, and forming a second lithographic pattern from the first lithographic pattern for a second substrate based, at least in part, on the at least one parameter received directly from the metrology process on the first substrate by the digital lithographic process for the second substrate.