Journal article
Acceleration of Biexciton Radiative Recombination at Low Temperature in CdSe Nanoplatelets
Nano letters, v 22(17), pp 6997-7004
14 Sep 2022
PMID: 36018835
Abstract
Colloidal semiconductor nanocrystals offer bandgap tunability, high photoluminescence quantum yield, and colloidal processing of benefit to optoelectronics, however rapid nonradiative Auger recombination (AR) deleteriously affects device efficiencies at elevated excitation intensities. AR is understood to transition from temperature-dependent behavior in bulk semiconductors to temperature-independent behavior in zero-dimensional quantum dots (QDs) as a result of discretized band structure that facilitates satisfaction of linear momentum conservation. For nanoplatelets (NPLs), two-dimensional morphology renders prediction of photophysical behaviors challenging. Here, we investigate and compare the temperature dependence of excited-stated lifetime and fluence-dependent emission of CdSe NPLs and QDs. For NPLs, upon temperature reduction, biexciton lifetime surprisingly decreases (even becoming shorter lived than trion emission) and emission intensity increases nearly linearly with fluence rather than saturating, consistent with dominance of radiative recombination rather than AR. CdSe NPLs thus differ fundamentally from core-only QDs and foster increased utility of photogenerated excitons and multiexcitons at low temperatures.
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Details
- Title
- Acceleration of Biexciton Radiative Recombination at Low Temperature in CdSe Nanoplatelets
- Creators
- Alexandra Brumberg - Northwestern UniversityNicolas E. Watkins - Northwestern UniversityBenjamin T. Diroll - Argonne National LaboratoryRichard D. Schaller - Northwestern UniversityArgonne National Laboratory (ANL), Argonne, IL (United States)
- Publication Details
- Nano letters, v 22(17), pp 6997-7004
- Publisher
- Amer Chemical Soc
- Number of pages
- 8
- Grant note
- 1808590 / National Science Foundation MSN Program Award DGE-1842165 / National Science Foundation Graduate Research Fellowship Program; National Science Foundation (NSF) International Institute for Nanotechnology at Northwestern University 3M Graduate Research Fellowship; 3M Ryan Fellowship DE-AC02-06CH11357 / U.S. DOE, Office of Basic Energy Sciences; United States Department of Energy (DOE)
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Chemistry
- Web of Science ID
- WOS:000879447600001
- Scopus ID
- 2-s2.0-85137291362
- Other Identifier
- 991022053866604721
InCites Highlights
Data related to this publication, from InCites Benchmarking & Analytics tool:
- Collaboration types
- Domestic collaboration
- Web of Science research areas
- Chemistry, Multidisciplinary
- Chemistry, Physical
- Materials Science, Multidisciplinary
- Nanoscience & Nanotechnology
- Physics, Applied
- Physics, Condensed Matter