Microwave Annealing Control with Pulsed Heating Feedback

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Solution Overview

Problem

Conventional annealing systems for semiconductor materials require continuous temperature monitoring and often rely on photovoltage measurements, which are inefficient and may lead to undesired strain or stress on the material due to sudden changes in microwave energy exposure.

Innovation Solution

A multi-pulse rapid thermal annealing system with a thermal shielding enclosure, microwave emitter, and temperature sensor, controlled by a control system that adjusts microwave emitter operational characteristics based on measured temperature to prevent overheating and ensure efficient annealing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If continuous microwave energy is applied for annealing, then the annealing process is efficient, but the material may overheat and degrade

Engineering Contradiction:

Improveannealing efficiencyVSAvoidmaterial degradation

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent applies periodic pulsed microwave energy instead of continuous energy application. The system delivers microwave energy in controlled pulses with specific duty cycles, allowing the material to heat during pulse periods and cool during inter-pulse periods. This periodic action prevents overheating and material degradation while maintaining annealing efficiency through cumulative thermal effects.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The patent implements a feedback control system that continuously monitors material temperature and adjusts microwave energy delivery accordingly. The control system receives temperature feedback from sensors and modulates the microwave emitter's power output, pulse width, and duty cycle to maintain optimal annealing temperature, preventing both overheating and underheating conditions.

Inventive Principle:

Principle #23Feedback

2Measurement precision

If photovoltage measurement is used for temperature monitoring, then temperature can be measured, but the system complexity increases and strain/stress may be introduced

Engineering Contradiction:

Improvetemperature measurement capabilityVSAvoidmonitoring system complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent replaces complex photovoltage measurement systems with simpler optical or contact-based temperature sensing methods. The system uses infrared sensors, thermocouples, or pyrometers that provide direct temperature measurement without requiring complex optical setups, reducing system complexity while maintaining measurement accuracy.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Speed

If sudden changes in microwave energy exposure are applied, then the annealing process can be accelerated, but undesired strain or stress is introduced

Engineering Contradiction:

Improveannealing rateVSAvoidmaterial strain and stress

Core Design Contradiction:

SpeedVSStability of the object's composition

Solution Approach 1:

The patent employs dynamic control of microwave energy delivery through variable pulse widths, duty cycles, and power levels that adapt to real-time material temperature and annealing stage. The system transitions from high-power initial pulses for rapid heating to lower-power sustained pulses for controlled annealing, maintaining material stability while achieving fast processing speeds.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent applies pre-heating pulses at reduced power levels before delivering full annealing energy. This gradual energy introduction prevents thermal shock and minimizes strain and stress in the material by allowing progressive thermal expansion and structural adjustment before high-energy treatment.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

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 system effectively controls temperature fluctuations, minimizing material degradation and optimizing the annealing process by adjusting microwave energy output in response to measured temperature, ensuring consistent and efficient material processing.

Implementation Method 1

applying a microwave energy to the sample using a microwave emitter

Methodology Applied

Scientific EffectDielectric heating: Dielectric Heating

Implementation Method 2

measuring a temperature of the sample receiving the microwave energy

Methodology Applied

Scientific EffectTemperature detection:

Data Source

PatentUS12546690B2Systems and methods for annealing samples

Publication Date: 2026.02.10 THE RES FOUNDATION FOR THE STATE UNIV OF NEW YORK

AI summary

A system and method for annealing samples. The system includes a thermal shielding enclosure including a cavity, with a first surface, a second surface, a microwave emitter, a sensor and a control system. Additionally, the control system can adjust operational characteristics of the microwave emitter in response to determining whether the measured temperature of the sample is equal to or greater than a first predetermined temperature of the sample or is equal to or less than a second predetermined temperature of the sample.