Semi-Polar Nitride Film Growth via AlInGaN Buffer Layer
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Solution Overview
Problem
Current methods for growing nitride semiconductor films on polar c-planes suffer from strong piezoelectric and spontaneous polarizations, leading to reduced carrier recombination efficiency and emission in optoelectronic devices, while growth on non-polar or semi-polar planes is challenging and not widely adopted due to difficulties in achieving large, planar, device-quality films.
Innovation Solution
A method for growing planar semi-polar nitride films using a single buffer layer of AlxInyGa1-x-yN on a substrate, allowing for a large area of (Al,In,Ga,B)N to be parallel to the substrate surface via metalorganic chemical vapor deposition (MOCVD), which reduces polarization effects and improves crystal quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If growth is performed on polar c-planes, then carrier recombination efficiency is reduced due to strong piezoelectric and spontaneous polarizations, but growth on non-polar or semi-polar planes is challenging and does not yield large planar device-quality films
Solution Approach 1:
The patent changes the crystallographic orientation parameter from polar c-plane to semi-polar planes (such as {10-13}, {11-22}, or {20-21}), which fundamentally alters the polarization characteristics. This parameter change reduces both piezoelectric and spontaneous polarizations, thereby improving carrier recombination efficiency while maintaining film quality through controlled growth conditions
Solution Approach 2:
The patent introduces a buffer layer as an intermediary between the substrate and the active device layers. This buffer layer serves as a transition zone that accommodates lattice mismatch and reduces dislocation density, enabling the growth of high-quality semi-polar films that would otherwise be difficult to obtain directly on substrates
2Object-affected harmful factors
If growth is performed on non-polar or semi-polar planes, then polarization effects are reduced, but achieving large area planar device-quality films is difficult
Solution Approach 1:
The patent optimizes multiple growth parameters including temperature, pressure, gas flow rates, and composition ratios to enable stable semi-polar film growth. By carefully controlling these parameters, the method achieves both reduced polarization effects and large area coverage with high film quality, making the process suitable for practical device fabrication
Solution Approach 2:
The patent employs a buffer layer with specific local properties (composition, thickness, structure) that is tailored to the requirements of semi-polar growth. This localized preparation creates optimal conditions for subsequent film growth, enabling large area coverage with uniform quality while maintaining the reduced polarization characteristics of semi-polar planes
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 method enables the growth of high-quality, planar semi-polar nitride films with reduced polarization, enhancing internal quantum efficiency and allowing for the fabrication of state-of-the-art nitride semi-polar electronic devices with improved surface and crystal features, suitable for large-area device processing.
Implementation Method 1
metalorganic chemical vapor deposition
Data Source
AI summary
A method for growing a semi-polar nitride semiconductor thin film via metalorganic chemical vapor deposition (MOCVD) on a substrate, wherein a nitride nucleation or buffer layer is grown on the substrate prior to the growth of the semi-polar nitride semiconductor thin film.