HVPE Reactor In-Situ Indium Source Generation

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Solution Overview

Problem

Current methods for growing high-quality indium nitride materials using hydride vapor phase epitaxy (HVPE) face challenges such as high defect densities, poor conductivity control, and contamination issues due to external source material synthesis, limiting the growth of high-quality InN and related nitride structures.

Innovation Solution

Generating indium source materials internally within the HVPE reactor, allowing for the collection and evaporation of indium-containing compounds to produce high-quality indium nitride through controlled reactions with reactive gases, thereby reducing contamination and improving material properties.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If external source materials are used for HVPE growth, then the growth process can proceed, but contamination and high defect densities occur

Engineering Contradiction:

Improvematerial qualityVSAvoidcontamination

Core Design Contradiction:

Manufacturing precisionVSObject-affected harmful factors

Solution Approach 1:

The patent extracts the source material synthesis step from the external environment and moves it inside the HVPE reactor. Indium source material is generated in-situ by reacting indium metal with hydrogen chloride gas within the reactor chamber, eliminating contamination from external source material handling and transport.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent introduces hydrogen chloride gas as an intermediary substance that facilitates the generation of indium source material inside the reactor. The HCl gas reacts with indium metal to form volatile indium chloride, which then serves as the actual source material for epitaxial growth, enabling clean in-situ source generation.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Manufacturing precision

If MOCVD is used for InN growth, then epitaxial layers can be deposited, but high defect density and poor conductivity control result

Engineering Contradiction:

Improvedefect densityVSAvoidconductivity control

Core Design Contradiction:

Manufacturing precisionVSReliability

Solution Approach 1:

The patent replaces the MOCVD chemical vapor deposition mechanism with an HVPE mechanism. Instead of using metal organic compounds that require complex decomposition and transport, the patent uses volatile indium chloride generated in-situ, which deposits more cleanly with fewer defects and better conductivity control through simplified chemistry.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Productivity

If MOCVD is used for InN growth, then epitaxial layers can be formed, but low deposition rates limit material thickness

Engineering Contradiction:

Improvedeposition rateVSAvoidmaterial thickness

Core Design Contradiction:

ProductivityVSLength of stationary object

Solution Approach 1:

The patent changes the fundamental deposition parameters by switching from MOCVD to HVPE methodology. The in-situ generated indium chloride source material enables higher deposition rates in HVPE compared to MOCVD, allowing growth of thicker nitride materials while maintaining quality.

Inventive Principle:

Principle #35Parameter changes

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 results in indium nitride with significantly reduced defect densities and improved crystalline quality, as evidenced by narrower x-ray rocking curve full widths at half maximum (FWHM) and enhanced optical properties, enabling the growth of high-quality InN and related nitride structures for advanced semiconductor applications.

Implementation Method 1

The first gas product is cooled so that the first gas product condenses into a condensate, which has a compound containing indium

Methodology Applied

Scientific EffectCondensation: Condensation

Implementation Method 2

The collected condensate is evaporated to produce a second gas product. The second gas product includes a compound containing indium

Methodology Applied

Scientific EffectEvaporation: Evaporation

Implementation Method 3

indium nitride is grown inside the reactor by a reaction of the second reactive gas and the second gas product resulting from evaporation of the collected condensate

Methodology Applied

Scientific EffectChemical Vapor Deposition: Chemical Vapour Deposition

Data Source

PatentUS11661673B1HVPE apparatus and methods for growing indium nitride and indium nitride materials and structures grown thereby

Publication Date: 2023.05.30 OSTENDO TECHNOLOGIES INC

AI summary

Hydride phase vapor epitaxy (HVPE) growth apparatus, methods and materials and structures grown thereby. An HVPE reactor includes generation, accumulation, and growth zones. A source material for growth of indium nitride is generated and collected inside the reactor. A first reactive gas reacts with an indium source inside the generation zone to produce a first gas product having an indium-containing compound. The first gas product is cooled and condenses into a liquid or solid condensate or source material having an indium-containing compound. The source material is collected in the accumulation zone. Vapor or gas resulting from evaporation of the condensate forms a second gas product, which reacts with a second reactive gas in the growth zone for growth of indium nitride.