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A Phonon Scattering Bottleneck for Carrier Cooling in Lead Chalcogenide Nanocrystals
- Source :
- ACS Nano, ACS Nano, 2015, 9 (1), pp.778-788. ⟨10.1021/nn5062723⟩, ACS Nano, American Chemical Society, 2015, 9 (1), pp.778-788. ⟨10.1021/nn5062723⟩
- Publication Year :
- 2015
- Publisher :
- American Chemical Society (ACS), 2015.
-
Abstract
- The cooling dynamics of hot charge carriers in colloidal lead chalcogenide nanocrystals is studied by hyperspectral transient absorption spectroscopy. We demonstrate a transient accumulation of charge carriers at a high energy critical point in the Brillouin zone. Using a theoretical study of the cooling rate in lead chalcogenides, we attribute this slowing down of charge carrier cooling to a phonon scattering bottleneck around this critical point. The relevance of this observation for the possible harvesting of the excess energy of hot carriers by schemes such as multiexciton generation is discussed.
- Subjects :
- Materials science
Chalcogenide
Physics::Optics
General Physics and Astronomy
02 engineering and technology
010402 general chemistry
01 natural sciences
7. Clean energy
Condensed Matter::Materials Science
chemistry.chemical_compound
Critical point (thermodynamics)
Ultrafast laser spectroscopy
General Materials Science
[PHYS.COND]Physics [physics]/Condensed Matter [cond-mat]
ComputingMilieux_MISCELLANEOUS
[PHYS]Physics [physics]
Condensed matter physics
Phonon scattering
General Engineering
021001 nanoscience & nanotechnology
0104 chemical sciences
Brillouin zone
Multiple exciton generation
chemistry
Quantum dot
Charge carrier
0210 nano-technology
Subjects
Details
- ISSN :
- 1936086X and 19360851
- Volume :
- 9
- Database :
- OpenAIRE
- Journal :
- ACS Nano
- Accession number :
- edsair.doi.dedup.....7d46672e8eb929d0e17422e99cc583f7