Microwave Curing Barrier for Microelectronic Devices

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Solution Overview

Problem

Conventional microwave curing methods for microelectronic devices can cause arcing and excessive heat accumulation, damaging components due to charge differentials and uneven heating, and varying frequencies may irreversibly alter materials like doped silicon and polymeric random access memory.

Innovation Solution

A method involving the construction of a microelectronic device with a radiation sensitive component and a curable component, where a barrier is formed to inhibit irradiation, allowing for variable-frequency microwave radiation to cure the curable component while protecting the radiation sensitive component, using a conductive barrier to reflect radiation and maintain uniform temperature.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If microwave energy is applied to cure curable materials, then curing time is reduced, but arcing and excessive heat accumulation occur causing localized damage

Engineering Contradiction:

Improvecuring timeVSAvoidarcing and excessive heat accumulation

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The microwave radiation source is divided into multiple independent radiation sources arranged in an array. Each radiation source can be independently controlled to deliver microwave energy to different regions of the curable material, distributing the energy input and preventing localized overheating and arcing.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the curable material receive customized microwave radiation based on their specific curing requirements. The system adjusts radiation parameters locally for each region, applying energy only where needed and at appropriate intensities, thereby avoiding excessive heat accumulation in sensitive areas.

Inventive Principle:

Principle #3Local quality

2Reliability

If variable frequency microwave radiation is used to prevent arcing, then curing effectiveness is improved, but radiation sensitive components are irreversibly altered

Engineering Contradiction:

Improvecuring effectivenessVSAvoidirreversible alteration of radiation sensitive components

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The array of microwave radiation sources is spatially segmented and positioned to direct radiation selectively toward curable materials while away from radiation-sensitive components. This spatial separation allows variable frequency operation for effective curing without exposing sensitive components to damaging frequencies.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different frequency parameters are applied to different regions containing different materials. Radiation-sensitive components are located in regions where frequencies known to cause damage are avoided, while curable materials receive frequencies optimized for their curing requirements.

Inventive Principle:

Principle #3Local quality

3Device complexity

If fixed frequency microwave energy is used, then curing process is simplified, but charge differential build-up causes arcing between components

Engineering Contradiction:

Improvecuring process complexityVSAvoidcharge differential and arcing

Core Design Contradiction:

Device complexityVSObject-affected harmful factors

Solution Approach 1:

The microwave radiation system transitions from fixed frequency to dynamically variable frequency operation. The frequency parameters are adjusted in real-time based on feedback from sensors monitoring the curing process, preventing charge differential build-up and arcing while maintaining curing effectiveness.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system incorporates feedback mechanisms that monitor the curing process and adjust microwave radiation parameters accordingly. When charge differential or arcing is detected, the system automatically modifies frequency and power levels to eliminate the harmful effects while continuing the curing process.

Inventive Principle:

Principle #23Feedback

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

This approach reduces arcing and heat accumulation, preventing damage to sensitive components during curing, while ensuring effective curing of materials without altering them irreversibly.

Implementation Method 1

a barrier is formed to inhibit irradiation... using a conductive barrier to reflect radiation

Methodology Applied

Scientific EffectReflection: Reflection

Implementation Method 2

irradiating the microelectronic device at a plurality of frequencies to at least partially cure the curable component

Methodology Applied

Scientific EffectDielectric heating: Dielectric Heating

Data Source

PatentUS8569093B2Microelectronic devices and methods for manufacturing microelectronic devices

Publication Date: 2013.10.29 MICRON TECHNOLOGY INC

AI summary

Microelectronic devices and methods for manufacturing microelectronic devices are disclosed herein. In one embodiment, a method includes constructing a radiation sensitive component in and/or on a microelectronic device, placing a curable component in and/or on the microelectronic device, and forming a barrier in and/or on the microelectronic device to at least partially inhibit irradiation of the radiation sensitive component. The radiation sensitive component can be doped silicon, chalcogenide, polymeric random access memory, or any other component that is altered when irradiated with one or more specific frequencies of radiation. The curable component can be an adhesive, an underfill layer, an encapsulant, a stand-off, or any other feature constructed of a material that requires curing by irradiation.