Aerogel Thermal Isolation for IC Substrates

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Solution Overview

Problem

Conventional materials used for thermal isolation in integrated circuits are inadequate in high thermal density environments, deteriorating over time and experiencing mechanical failures such as cracks and delamination, leading to inefficient heat management and potential thermal runaway.

Innovation Solution

An aerogel coating is applied to one side of an IC substrate during manufacturing, providing thermal isolation by reducing heat transmission between ICs, mitigating thermal stress, and offering chemical and mechanical insulation, thus facilitating efficient thermal extraction from localized hotspots.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional materials are used for thermal isolation, then the device can be manufactured with standard materials, but the materials deteriorate over time and experience mechanical failures such as cracks and delamination

Engineering Contradiction:

Improvethermal isolation effectivenessVSAvoidservice life of thermal isolation material

Core Design Contradiction:

ReliabilityVSDuration of action of stationary object

Solution Approach 1:

The patent changes the physical and chemical parameters of the thermal isolation material by using aerogel instead of conventional materials. Aerogel has extremely low thermal conductivity, high porosity, and exceptional thermal stability, which resolves the contradiction by providing both effective thermal isolation and long service life without deterioration or mechanical failure

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs aerogel, a composite material with unique properties combining ultra-low density with high strength and exceptional thermal stability. This composite structure provides both the required thermal isolation performance and the mechanical durability to prevent cracks and delamination over time

Inventive Principle:

Principle #40Composite materials

2Ease of manufacture

If conventional bonding materials are used between IC substrates, then the bonding process is simple, but thermal isolation is inadequate in high thermal density environments leading to compound heat generation

Engineering Contradiction:

Improvebonding process simplicityVSAvoidheat transmission between substrates

Core Design Contradiction:

Ease of manufactureVSTemperature

Solution Approach 1:

The patent changes the thermal parameters of the bonding interface by incorporating aerogel into the bonding material or as an interface layer. This provides adequate thermal isolation in high thermal density environments while maintaining the simplicity of the bonding process through direct application of the aerogel-containing material

Inventive Principle:

Principle #35Parameter changes

3Device complexity

If no thermal isolation coating is applied, then the manufacturing process is simpler, but heat couples between stacked electronic devices causing thermal runaway

Engineering Contradiction:

Improvemanufacturing process complexityVSAvoidthermal stability of stacked devices

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent applies a thin aerogel coating film on the IC substrate surface. This thin film provides effective thermal isolation to prevent heat coupling between stacked devices while adding minimal complexity to the manufacturing process. The coating can be applied as a thin layer that does not significantly increase device dimensions or manufacturing steps

Inventive Principle:

Principle #30Flexible shells and thin films

Solution Approach 2:

The aerogel coating acts as an intermediary thermal barrier between stacked electronic devices. It mediates the thermal interaction by providing high thermal resistance at the interface, preventing heat from one device from coupling to another, thus maintaining thermal stability without requiring complex active cooling systems

Inventive Principle:

Principle #24Intermediary (Mediator)

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 aerogel coating effectively reduces the risk of overheating, provides insulation against contamination, and enhances system performance by maintaining proper circuit behavior and efficient thermal management in high-power applications.

Implementation Method 1

an aerogel coating is applied to one side of an IC substrate... providing thermal isolation by reducing heat transmission between ICs

Methodology Applied

Scientific EffectThermal Insulation: Thermal Insulation

Data Source

PatentUS8767411B2Electronic device with aerogel thermal isolation

Publication Date: 2014.07.01 TAIWAN SEMICONDUCTOR MANUFACTURING CO LTD

AI summary

During manufacture of an electronic device, an aerogel coating is applied to a first side of an IC substrate of a first IC. A bonding procedure is initiated, during which IC interconnects are either placed on the coated side of the substrate or on the opposite side of the substrate. The first IC is connected on a carrier to a second IC with the coated side of the first IC facing the second IC to reduce heat transmission to the second IC during operation of the first IC. The aerogel coating reduces thermal stress to the circuit board and surrounding components, reduces the risk of overheating of critical circuit components, provides chemical and mechanical insulation from contamination during subsequent wafer handling operations, and provides a thermal isolator between IC regions of dissimilar power dissipation, which isolator facilitates efficient thermal extraction from localized hotspots.