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Measurements of Strain

Measurements of Strain

Strain quantifies the deformation of a material under force, typically measured as normal strain, which represents the change in length when compared with the original length. Electrical strain gauges are used for enhanced accuracy. These devices consist of a conductive wire mounted on a paper backing that adheres to the material's surface. These gauges operate on the piezoresistive effect, where the wire's electrical resistance changes in response to mechanical deformation. The strain gauge...

Biasing of Metal-Semiconductor Junctions

Biasing of Metal-Semiconductor Junctions

Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...

Design Example: Strain Gauge Bridge or Wheatstone Bridge

Design Example: Strain Gauge Bridge or Wheatstone Bridge

The utilization of strain gauges as transducers for converting mechanical strain into electrical signals is a common practice in various engineering applications. These strain gauges are frequently integrated into Wheatstone bridge circuits to accurately measure parameters such as force or pressure. Within this context, each element within the circuit exhibits a resistance that undergoes subtle variations when subjected to mechanical strain. The primary objective is to convert minuscule...

Shearing Strain

Shearing Strain

The shearing strain represents a cubic element's angular change when subjected to shearing stress. This type of stress can transform a cube into an oblique parallelepiped without influencing normal strains. The cubic element experiences a significant transformation when exposed solely to shearing stress. Its shape alters from a perfect cube into a rhomboid, clearly demonstrating the effect of shearing strain. The degree of this strain is considered positive if it reduces the angle between the...

Transformation of Plane Strain

Transformation of Plane Strain

When analyzing elongated structures like bars subjected to uniformly distributed loads, it is essential to understand the transformation of plane strain when coordinate axes are rotated. This transformation helps to assess how material deformation characteristics vary with orientation, which is crucial in materials science and structural engineering.
Under plane strain conditions, typical for members where one dimension significantly exceeds the others, deformations and resultant strains are...

Thermal Strain

Thermal Strain

Thermal strain is a concept that arises when we consider how temperature changes affect structures. Unlike the conventional assumption that structures remain constant under load, real-world scenarios often involve temperature fluctuations that can significantly impact these structures. Consider a homogeneous rod with a uniform cross-section resting freely on a flat horizontal surface. If the rod's temperature increases, the rod elongates. This elongation is proportional to the temperature...

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Related Experiment Video

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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

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Published on: August 2, 2019

Interface modification of the InGaN/GaN quantum wells: the strain pre-relief effect.

Z L Fang¹, D Q Lin, J Y Kang

¹Semiconductor Photonics Research Center, Department of Physics, Xiamen University, Xiamen 361005, People's Republic of China. zhilaifang@hotmail.com

|May 19, 2009

Summary

Interface modification using ultrathin low-temperature Gallium Nitride (GaN) layers improves Indium Gallium Nitride/Gallium Nitride (InGaN/GaN) quantum well properties. This method enhances surface smoothness and suppresses indium aggregation, leading to better material quality.

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Nanofabrication of Gate-defined GaAs/AlGaAs Lateral Quantum Dots

Nanofabrication of Gate-defined GaAs/AlGaAs Lateral Quantum Dots

Published on: November 1, 2013

Area of Science:

Materials Science
Semiconductor Physics
Nanotechnology

Background:

Indium Gallium Nitride/Gallium Nitride (InGaN/GaN) quantum wells are crucial for optoelectronic devices.
Achieving high-quality InGaN/GaN heterostructures is challenging due to issues like indium aggregation and phase separation.
Interface control is vital for optimizing the performance of these quantum wells.

Purpose of the Study:

To improve the properties of InGaN/GaN quantum wells.
To investigate the effect of interface modification using an ultrathin low-temperature Gallium Nitride (GaN) layer.
To understand the underlying physical mechanisms responsible for property enhancement.

Main Methods:

Interface modification by inserting an ultrathin low-temperature GaN layer before high-temperature GaN barrier growth.
Post-growth annealing process.
Characterization techniques including surface morphology analysis, photoluminescence (PL), and X-ray Photoelectron Spectroscopy (XPS).

Main Results:

Significantly improved surface morphology with enhanced smoothness and reduced pit density.
Suppression of indium aggregation and phase separation.
Demonstrated 'strain pre-relief effect' attributed to quasi-dot formation.
Ultrathin low-temperature GaN layers provided a protective function.

Conclusions:

Interface modification with ultrathin low-temperature GaN is an effective strategy for improving InGaN/GaN quantum well quality.
The 'strain pre-relief effect' plays a key role in mitigating material degradation.
This approach offers a pathway to enhanced optoelectronic device performance.