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Glassy-like Transients in Semiconductor Nanomaterials.

Isaac Balberg¹

¹The Racah Institute of Physics, The Hebrew University, Jerusalem 9190401, Israel.

Nanomaterials (Basel, Switzerland)

|March 12, 2024

Summary

This study reveals that glassy behavior in semiconductor nanomaterials arises from their nanoscale properties, influenced by quantum confinement and Coulomb blockade effects. Understanding these mechanisms is key for developing advanced nanodevices.

Keywords:

glassy behavior nano-semiconductors nonvolatile electrical and optical memories quantum confinement and Coulomb blockade quantum dots and MOSFETs transient currents

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Area of Science:

Condensed Matter Physics
Materials Science
Nanotechnology

Background:

Glassy behavior, characterized by time-dependent physical properties, is observed in disordered systems but its mechanisms remain debated.
Electrical conductivity transients in disordered systems exhibit glassy behavior, with ongoing research into its underlying causes.

Purpose of the Study:

Investigate the influence of quantum confinement (QC) and Coulomb blockade (CB) effects on glassy-like behavior in semiconductor nanomaterials.
Examine transient electrical currents in CdSe and Si nanosize crystallites, considering size and temperature dependencies.
Analyze current transients during excitation, not just post-excitation, to understand glassy behavior origins.

Main Methods:

Studied transient electrical currents in semiconductor systems containing CdSe or Si nanosize crystallites.
Varied crystallite size and ambient temperature to observe effects on current transients.
Analyzed both pre- and post-excitation current transients to elucidate glassy behavior mechanisms.

Main Results:

Demonstrated that glassy behavior in these systems is intrinsically linked to their nanoscale nature.
Confirmed that quantum confinement and Coulomb blockade effects significantly influence the observed glassy characteristics.
Identified temperature dependence of transients, providing insights into macroscopic and microscopic transport mechanisms.

Conclusions:

Glassy electrical transients in nanomaterials are explained by energy minimization and minimal energy dissipation principles, affecting conductivity percolation.
The similarity between electron localization (due to CB) and particle caging in mechanical glasses provides a deep reason for observed glassy-like behavior.
Findings are crucial for designing semiconductor nanodevices like quantum dot memories and quantum well MOSFETs.