Coherent Acoustic Phonons in Colloidal Semiconductor Nanocrystal Superlattices
Abstract
The phonon properties of films fabricated from colloidal semiconductor nanocrystals play a major role in thermal conductance and electron scattering, which govern the principles for building colloidal-based electronics and optics including thermoelectric devices with a high ZT factor. The key point in understanding the phonon properties is to obtain the strength of the elastic bonds formed by organic ligands connecting the individual nanocrystallites. In the case of very weak bonding, the ligands become the bottleneck for phonon transport between infinitively rigid nanocrystals. In the opposite case of strong bonding, the colloids cannot be considered as infinitively rigid beads and the distortion of the superlattice caused by phonons includes the distortion of the colloids themselves. We use the picosecond acoustics technique to study the acoustic coherent phonons in superlattices of nanometer crystalline CdSe colloids. We observe the quantization of phonons with frequencies up to 30 GHz. The frequencies of quantized phonons depend on the thickness of the colloidal films and possess linear phonon dispersion. Finally, the measured speed of sound and corresponding wave modulus in the colloidal films point on the strong elastic coupling provided by organic ligands between colloidal nanocrystals.
- Authors:
-
- Univ. of Nottingham (United Kingdom)
- Technische Univ. of Dortmund (Germany)
- Univ. of Pennsylvania, Philadelphia, PA (United States)
- Russian Academy of Sciences, St. Petersburg (Russia)
- Technische Univ. of Dortmund (Germany); Russian Academy of Sciences, St. Petersburg (Russia)
- Publication Date:
- Research Org.:
- Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; German Research Foundation (DFG); German Ministry of Education and Research (BMBF); Government of Russia
- OSTI Identifier:
- 1247347
- Grant/Contract Number:
- SC0002158; BA 1549/14-1; 05K13PE1; 14.B25.31.0025
- Resource Type:
- Accepted Manuscript
- Journal Name:
- ACS Nano
- Additional Journal Information:
- Journal Volume: 10; Journal Issue: 1; Journal ID: ISSN 1936-0851
- Publisher:
- American Chemical Society (ACS)
- Country of Publication:
- United States
- Language:
- ENGLISH
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; nanocrystal superlattice; colloidal nanoparticles; thin film; acoustic phonons; speed of sound
Citation Formats
Poyser, Caroline L., Czerniuk, Thomas, Akimov, Andrey, Diroll, Benjamin T., Gaulding, E. Ashley, Salasyuk, Alexey S., Kent, Anthony J., Yakovlev, Dmitri R., Bayer, Manfred, and Murray, Christopher B. Coherent Acoustic Phonons in Colloidal Semiconductor Nanocrystal Superlattices. United States: N. p., 2015.
Web. doi:10.1021/acsnano.5b06465.
Poyser, Caroline L., Czerniuk, Thomas, Akimov, Andrey, Diroll, Benjamin T., Gaulding, E. Ashley, Salasyuk, Alexey S., Kent, Anthony J., Yakovlev, Dmitri R., Bayer, Manfred, & Murray, Christopher B. Coherent Acoustic Phonons in Colloidal Semiconductor Nanocrystal Superlattices. United States. https://doi.org/10.1021/acsnano.5b06465
Poyser, Caroline L., Czerniuk, Thomas, Akimov, Andrey, Diroll, Benjamin T., Gaulding, E. Ashley, Salasyuk, Alexey S., Kent, Anthony J., Yakovlev, Dmitri R., Bayer, Manfred, and Murray, Christopher B. Tue .
"Coherent Acoustic Phonons in Colloidal Semiconductor Nanocrystal Superlattices". United States. https://doi.org/10.1021/acsnano.5b06465. https://www.osti.gov/servlets/purl/1247347.
@article{osti_1247347,
title = {Coherent Acoustic Phonons in Colloidal Semiconductor Nanocrystal Superlattices},
author = {Poyser, Caroline L. and Czerniuk, Thomas and Akimov, Andrey and Diroll, Benjamin T. and Gaulding, E. Ashley and Salasyuk, Alexey S. and Kent, Anthony J. and Yakovlev, Dmitri R. and Bayer, Manfred and Murray, Christopher B.},
abstractNote = {The phonon properties of films fabricated from colloidal semiconductor nanocrystals play a major role in thermal conductance and electron scattering, which govern the principles for building colloidal-based electronics and optics including thermoelectric devices with a high ZT factor. The key point in understanding the phonon properties is to obtain the strength of the elastic bonds formed by organic ligands connecting the individual nanocrystallites. In the case of very weak bonding, the ligands become the bottleneck for phonon transport between infinitively rigid nanocrystals. In the opposite case of strong bonding, the colloids cannot be considered as infinitively rigid beads and the distortion of the superlattice caused by phonons includes the distortion of the colloids themselves. We use the picosecond acoustics technique to study the acoustic coherent phonons in superlattices of nanometer crystalline CdSe colloids. We observe the quantization of phonons with frequencies up to 30 GHz. The frequencies of quantized phonons depend on the thickness of the colloidal films and possess linear phonon dispersion. Finally, the measured speed of sound and corresponding wave modulus in the colloidal films point on the strong elastic coupling provided by organic ligands between colloidal nanocrystals.},
doi = {10.1021/acsnano.5b06465},
journal = {ACS Nano},
number = 1,
volume = 10,
place = {United States},
year = {Tue Dec 22 00:00:00 EST 2015},
month = {Tue Dec 22 00:00:00 EST 2015}
}
Web of Science
Figures / Tables:
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