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Semiconductors

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There is variation in the electrical conductivity of materials - metals, semiconductors, and insulators that are showcased with the help of the energy band diagrams.
Metals such as copper (Cu), zinc (Zn), or lead (Pb) have low resistivity and feature conduction bands that are either not fully occupied or overlap with the valence band, making a bandgap non-existent. This allows electrons in the highest energy levels of the valence band to easily transition to the conduction band upon gaining...

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The Debye-Hückel-Onsager equation is a cornerstone of physical chemistry, providing a method to determine the molar conductance (Λm) and molar conductance at infinite dilution (Λ°m) for uni-univalent electrolytes.Uni-univalent electrolytes are electrolytes that dissociate in solution to produce one cation with a +1 charge and one anion with a –1 charge per formula unit.This equation addresses two crucial phenomena: the asymmetry effect and the electrophoretic effect. According to this equation,...

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Related Experiment Video

Updated: May 9, 2026

Characterization of Thermal Transport in One-dimensional Solid Materials

Characterization of Thermal Transport in One-dimensional Solid Materials

Published on: January 26, 2014

Single molecule conductance, thermopower, and transition voltage.

Shaoyin Guo¹, Gang Zhou, Nongjian Tao

¹Center for Bioelectronics and Biosensors, Biodesign Institute, and Department of Electrical Engineering, Arizona State University , Tempe, Arizona 85287, United States.

|July 31, 2013

Summary

We measured single-molecule thermopower and found it correlates with transition voltage, not conductance. This reveals insights into molecular energy level alignment relative to electrode Fermi levels.

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Last Updated: May 9, 2026

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Ohmic Contact Fabrication Using a Focused-ion Beam Technique and Electrical Characterization for Layer Semiconductor Nanostructures

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The Frequency Domain Thermoreflectance Technique for Thermal Property Measurements

The Frequency Domain Thermoreflectance Technique for Thermal Property Measurements

Published on: December 5, 2025

Area of Science:

Molecular electronics
Quantum transport phenomena

Background:

Understanding charge transport in single molecules is crucial for molecular electronics.
Thermopower measurements offer a complementary probe to conductance for characterizing molecular junctions.

Purpose of the Study:

To measure and analyze the thermopower of single molecules.
To investigate the relationship between thermopower, conductance, and transition voltage.
To explore the utility of thermopower for determining molecular energy level alignment.

Main Methods:

Measurement of thermopower, conductance, current-voltage characteristics, and transition voltage in single-molecule junctions.
Utilizing a theoretical framework based on Landauer's formula for analysis.

Main Results:

Thermopower showed minimal correlation with conductance.
Thermopower exhibited a decrease with increasing transition voltage.
The observed trends align with theoretical predictions.

Conclusions:

Thermopower is a valuable metric for assessing molecular energy level alignment.
The transition voltage serves as a key indicator of energy level alignment.
This work provides a deeper understanding of charge and heat transport in molecular systems.