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Related Concept Videos

Mechanisms of Heat Transfer II01:20

Mechanisms of Heat Transfer II

In convection, thermal energy is carried by the large-scale flow of matter. Ocean currents and large-scale atmospheric circulation, which result from the buoyancy of warm air and water, transfer hot air from the tropics toward the poles and cold air from the poles toward the tropics. The Earth’s rotation interacts with those flows, causing the observed eastward flow of air in the temperate zones. Convection dominates heat transfer by air, and the amount of available space for the airflow...
Mechanisms of Heat Transfer01:14

Mechanisms of Heat Transfer

Heat transfer between the human body and its environment occurs through four main mechanisms: conduction, convection, radiation, and evaporation.
Conduction, accounting for approximately 3% of body heat loss at rest, is the process of exchanging heat between molecules of two materials in direct contact. This can result in both heat loss and gain. For instance, when the body is submerged in water, which conducts heat 20 times more effectively than air, it can either lose or gain significant heat.
Mechanism of heat transfer01:19

Mechanism of heat transfer

Understanding heat transfer mechanisms is essential for understanding how our bodies maintain balance in different environmental conditions. When the environment is thermoneutral, the body is in a state of balance, neither using nor releasing energy to maintain its core temperature. However, when the environment is not thermoneutral, the body employs four heat transfer mechanisms to maintain homeostasis: conduction, convection, evaporation, and radiation. These mechanisms facilitate heat...
Mechanisms of Heat Transfer I01:14

Mechanisms of Heat Transfer I

Just as interesting as the effects of heat transfer on a system are the methods by which the heat transfer occur. Whenever there is a temperature difference, heat transfer occurs. It may occur rapidly, such as through a cooking pan, or slowly, such as through the walls of a picnic ice box. So many processes involve heat transfer that it is hard to imagine a situation where no heat transfer occurs. Yet, every heat transfer takes place by only three methods: conduction, convection, and radiation.
Carrier Transport01:21

Carrier Transport

The generation of electrical current in semiconductors is fundamentally driven by two mechanisms: drift and diffusion. These processes are essential for the functionality and performance of semiconductor-based devices.
Drift Current:
The drift of charge carriers is started by an external electric field (E). Charged particles, such as electrons and holes, experience an acceleration between collisions with lattice atoms. For electrons, this results in a drift velocity (vd) given by:
Thermal expansion and Thermal stress: Problem Solving01:27

Thermal expansion and Thermal stress: Problem Solving

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 °C.

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Related Experiment Video

Updated: Jun 7, 2026

Characterization of Thermal Transport in One-dimensional Solid Materials
05:20

Characterization of Thermal Transport in One-dimensional Solid Materials

Published on: January 26, 2014

Governing Thermal Transport in Three-Dimensional Electronics.

Kyubeen Kim1,2, Minho Jin1,3, Sanggeun Bae1,4

  • 1Department of Mechanical Engineering and Materials Science, Washington University in St. Louis, St. Louis, Missouri 63130, United States.

ACS Nano
|June 6, 2026
PubMed
Summary
This summary is machine-generated.

Thermal management is a key challenge for 3D integrated circuits. Understanding materials physics and interfacial thermal boundary conductance (TBC) is crucial for efficient heat dissipation in stacked chip designs.

Keywords:
3D integrated circuitselectrothermal couplingmonolithic 3D integrationthermal boundary conductancethermal transport

Related Experiment Videos

Last Updated: Jun 7, 2026

Characterization of Thermal Transport in One-dimensional Solid Materials
05:20

Characterization of Thermal Transport in One-dimensional Solid Materials

Published on: January 26, 2014

Area of Science:

  • Materials Science
  • Electrical Engineering
  • Semiconductor Physics

Background:

  • 3D integrated circuits (3D ICs) face thermal management challenges due to stacked architectures.
  • Heat dissipation is confined within the back-end-of-line (BEOL) heterostructure, increasing interfacial resistance.
  • Interfacial resistance and thin-film effects significantly impact temperature and reliability in 3D ICs.

Purpose of the Study:

  • To highlight the materials physics governing thermal limits in 3D ICs.
  • To connect thermal physics to integration and design considerations for 3D ICs.
  • To discuss thermal pathways and potential solutions for improved heat management.

Main Methods:

  • Analysis of carrier-phonon relaxation pathways for lattice heating.
  • Discussion of heat transport in nanoscale BEOL multilayer stacks, considering thickness-dependent conduction and thermal penetration.
  • Examination of vertical heat removal mechanisms, including interfacial thermal boundary conductance (TBC) and electrothermal coupling.

Main Results:

  • Lattice heating involves carrier-phonon relaxation and optical phonon baths modulating ultrafast thermal responses.
  • Heat transport in nanoscale BEOL stacks is influenced by thickness-dependent conduction and thermal penetration.
  • Vertical heat removal is dictated by TBC and electrothermal coupling, with parasitic Joule heating as a factor.

Conclusions:

  • Effective thermal management in 3D ICs requires addressing interfacial resistance and size effects.
  • Optimizing thermal pathways through advanced materials and architectures is essential for reliable 3D IC operation.
  • Future solutions include thermally conductive dielectrics, TBC-enhancing interlayers, advanced bonding, and functional via designs.