Related Experiment Video
Updated: Jan 28, 2026

12:57
Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection
Published on: October 13, 2017
9.6K
Measurements of the Thermal Resistivity of InAlAs, InGaAs, and InAlAs/InGaAs Superlattices
ACS Applied Materials & Interfaces
|February 27, 2019
Summary
Alloy semiconductor superlattices like InAlAs/InGaAs exhibit higher thermal resistivity than bulk materials. This resistance can be tuned by interface engineering, crucial for nanoscale thermal management.
Area of Science:
- Materials Science
- Solid State Physics
- Nanotechnology
Background:
- Effective thermal management in nanoscale devices requires understanding material properties and interfaces.
- The thermal conductivity of alloy semiconductor superlattices (e.g., InAlAs/InGaAs) compared to their bulk constituents is not well established.
Purpose of the Study:
- To measure the cross-plane thermal resistivity of InAlAs/InGaAs superlattices at room temperature.
- To investigate the influence of lattice mismatch and layer thickness on superlattice thermal conductivity.
- To determine the thermal conductivity of InAlAs films lattice-matched to InP substrates.
Main Methods:
- Measurement of cross-plane thermal resistivity using experimental techniques.
- Fabrication of InAlAs/InGaAs superlattices with varying compositions and layer thicknesses.
- Characterization of InAlAs and InGaAs thin films.
Main Results:
- InAlAs/InGaAs superlattices show 1.2-1.6 times higher thermal resistivity than bulk alloys.
- Superlattice thermal resistance is tunable by a factor of 2.5 via lattice mismatch control.
- Thermal resistance shows minimal increase as layer thickness decreases from 4 to 2 nm.
- Measured thermal conductivity of InAlAs is 2.24 ± 0.09 (W/cm·K), significantly lower than estimates.
Conclusions:
- Alloy semiconductor superlattices present enhanced thermal resistance compared to bulk materials.
- Interface engineering, specifically lattice mismatch, is a viable strategy to tune thermal transport in superlattices.
- Accurate thermal properties of constituent materials like InAlAs are critical for reliable nanoscale thermal modeling.
Related Concept Videos
Thermal expansion and Thermal stress: Problem Solving
2.2K
San Francisco's Golden Gate Bridge is exposed to temperatures ranging from -15 °C to 40 °C. At its coldest, the main span of the bridge is 1275 m long. Assuming that the bridge is made entirely of steel, what is the change in its length between these temperatures?
To solve the problem, first, identify the known and unknown quantities. The initial length (L) of the bridge is 1275 m, the coefficient of linear expansion (α) for steel is 12 x 10-6/°C, and the change in temperature (ΔT) is 55...
To solve the problem, first, identify the known and unknown quantities. The initial length (L) of the bridge is 1275 m, the coefficient of linear expansion (α) for steel is 12 x 10-6/°C, and the change in temperature (ΔT) is 55...
2.2K
Thermal Strain
2.8K
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...
2.8K
Resistivity
4.5K
When a voltage is applied to a conductor, an electrical field is generated, and charges in the conductor feel the force due to the electrical field. The current density that results depends on the electrical field and the properties of the material. In some materials, including metals at a given temperature, the current density is approximately proportional to the electrical field. In these cases, the current density can be modeled as:
4.5K
Resistance
5.9K
When a current moves through any conductor, the conductor causes some level of difficulty for the current to flow. The measure of that difficulty is known as the resistance of the material and is represented by R. Every material has its own resistance. In the case of conductors, heat is emitted whenever a current passes through them. Resistance depends on the resistivity of the material. Resistivity is a characteristic of the material used to fabricate electrical components, whereas the...
5.9K
Thermal Expansion
5.6K
The expansion of alcohol in a thermometer is one of many commonly encountered examples of thermal expansion, which is the change in size or volume of a given system as its temperature changes. The most visible example is the expansion of hot air. When air is heated, it expands and becomes less dense than the surrounding air, which then exerts an upward force on the hot air to, for example, make steam and smoke rise, and hot air balloons float. The same behavior happens in all liquids and gases,...
5.6K
Thermal Stress
3.3K
If the temperature of an object is changed while it is prevented from expanding or contracting, the object is subjected to stress. The stress is compressive if the object expands in the absence of constraint and tensile if it contracts. This stress resulting from temperature change is known as thermal stress. It can be quite large and can cause damage. To avoid this stress, engineers may design components so they can expand and contract freely. For instance, on highways, gaps are deliberately...
3.3K

