Epoxy Resin Composition with Prismatic Cristobalite for Semiconductor Encapsulation
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Solution Overview
Problem
Existing epoxy resin compositions for encapsulating semiconductor devices face challenges in achieving high flame retardancy without using harmful halogen-based or phosphorus-based flame retardants, while also addressing warpage issues and ensuring excellent workability, moldability, and reliability, especially in asymmetric one-sided encapsulation structures.
Innovation Solution
An epoxy resin composition incorporating prismatic cristobalite as an inorganic filler, along with a phenolaralkyl type epoxy resin and a phenolic curing agent, which provides a balance of flame retardancy, mechanical properties, and reduced warpage, without using halogen-based or phosphorus-based flame retardants, and is suitable for encapsulating semiconductor devices with asymmetric one-sided structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If halogen-based or phosphorus-based flame retardants are used to achieve high flame retardancy, then flame retardancy is improved, but harmful factors to human body and devices increase
Solution Approach 1:
The patent changes the chemical composition parameters by using sulfur-based flame retardants (such as sulfur compounds and sulfur-containing resins) instead of halogen-based or phosphorus-based flame retardants. This parameter substitution maintains flame retardancy while eliminating harmful factors, as sulfur-based compounds provide effective flame suppression without the toxic byproducts associated with halogen and phosphorus compounds.
Solution Approach 2:
The patent employs composite materials by combining sulfur-based flame retardants with epoxy resin matrices and inorganic fillers. This composite approach creates a synergistic effect where the sulfur-based flame retardant system works together with the resin and filler components to achieve high flame retardancy (UL94 V-0 rating) while maintaining mechanical properties and eliminating harmful substances.
2Productivity
If asymmetric one-sided encapsulation structure is used to meet high pin counts, then integration is improved, but warpage increases
Solution Approach 1:
The patent changes the physical and chemical parameters of the encapsulation resin by incorporating sulfur-based flame retardants and optimizing the resin composition. These parameter changes affect the thermal expansion coefficient and curing characteristics of the resin, enabling it to better match the asymmetric one-sided encapsulation structure and reduce differential stress that causes warpage, while still supporting high pin count configurations.
3Ease of manufacture
If workability and moldability are improved for manufacturing, then ease of manufacture is improved, but flame retardancy may be compromised
Solution Approach 1:
The patent optimizes the parameter balance by selecting sulfur-based flame retardants with appropriate viscosity and reactivity characteristics that maintain good workability and moldability. The resin composition is formulated to achieve optimal curing flow and filling properties while incorporating sufficient sulfur-based flame retardant content to attain UL94 V-0 flame retardancy rating, thus balancing manufacturability with safety requirements.
Data Source
AI summary
An epoxy resin composition for encapsulating a semiconductor device, the epoxy resin composition including an epoxy resin, a curing agent, and one or more inorganic fillers, the one or more inorganic fillers including prismatic cristobalite, the prismatic cristobalite being present in the epoxy resin composition in an amount of about 1 to about 50% by weight, based on the total weight of the epoxy resin composition.