Dopant Ink Viscosity Control for Semiconductor Printing
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Solution Overview
Problem
Existing dopant-containing inks face challenges in controlling line shape, thickness, dopant concentration, and integration in electronic device manufacturing, leading to variability in semiconductor doping and electrical characteristics.
Innovation Solution
Dopant formulations comprising polymer vehicles, dopants, solvents, and rheology modifiers with low metal content, designed for specific viscosity and rheological properties to prevent pattern distortion and ensure uniform doping, used in printing processes for semiconductor layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If dopant-containing inks are used for printing semiconductor layers, then doping of underlying silicon can be achieved, but control over line shape and thickness becomes difficult
Solution Approach 1:
The patent modifies the physical and chemical parameters of the dopant ink formulation, specifically adjusting viscosity (to 1-100 cP range), surface tension (to 20-40 mN/m range), and composition ratios to achieve optimal printability and line shape control while maintaining ease of operation in printing processes
Solution Approach 2:
The patent employs composite dopant ink formulations containing multiple components including dopant compounds, polymer vehicles, solvents, and additives in specific ratios. This composite structure enables simultaneous control of rheological properties for printability and chemical properties for effective doping, resolving the contradiction between manufacturing precision and operational ease
2Reliability
If dopant concentration is increased to ensure uniform doping, then doping effectiveness improves, but variability in electrical characteristics increases
Solution Approach 1:
The patent implements feedback control through precise formulation specification, where the dopant ink composition is carefully controlled with dopant concentration in the range of 0.1-10% and specific rheological parameters. This feedback mechanism ensures that each printing cycle produces consistent results, achieving both doping uniformity and electrical characteristic control
Solution Approach 2:
The patent optimizes the dopant concentration parameter within a specific range (0.1-10%) and adjusts accompanying parameters such as viscosity and surface tension to achieve the dual goal of uniform doping and controlled electrical characteristics, resolving the contradiction between reliability and manufacturing precision
3Ease of manufacture
If printing processes are used to deposit dopant composition, then material deposition is achieved, but integration with other underlying layers becomes problematic
Solution Approach 1:
The patent modifies the chemical composition parameters of the dopant ink to ensure compatibility with underlying layers. By controlling pH, adding specific additives, and adjusting composition ratios, the ink achieves effective material deposition while maintaining reliability in integration with silicon, silicon oxide, and other semiconductor layers
Solution Approach 2:
The patent introduces polymer vehicles and surfactant additives as intermediary substances that facilitate compatibility between the dopant ink and underlying layers. These intermediaries prevent adverse reactions while enabling effective material deposition, resolving the contradiction between ease of manufacture and layer compatibility
Data Source
AI summary
Printable dopant formulations, methods of making such dopant formulations, and methods of using such dopant formulations are disclosed. The dopant formulations provide a printable dopant ink with a viscosity sufficient to prevent ink spreading when deposited in a pattern on a substrate. Furthermore, an ion exchange purification process provides the dopant formulation with a reduced metal ion concentration, and thus a relatively high purity level. Consequently, the dopant residue remaining on the substrate after curing and/or dopant activation process is relatively uniform, and therefore can be easily removed.