Journal article
Anisotropic Transient Disordering of Colloidal, Two-Dimensional CdSe Nanoplatelets upon Optical Excitation
Nano letters, v 21(3), pp 1288-1294
10 Feb 2021
PMID: 33464913
Abstract
Nanoplatelets (NPLs)-colloidally synthesized, spatially anisotropic, two-dimensional semiconductor quantum wells-are of intense interest owing to exceptionally narrow transition line widths, coupled with solution processability and bandgap tunability. However, given large surface areas and undercoordinated bonding at facet corners and edges, excitation under sufficient intensities may induce anisotropic structural instabilities that impact desired properties. We employ time-resolved X-ray diffraction to study the crystal structure of CdSe NPLs in response to optical excitation. Photoexcitation induces greater out-of-plane than in-plane disordering in 4 and 5 monolayer (ML) NPLs, while 3 ML NPLs display the opposite behavior. Recovery dynamics suggest that out-of-plane cooling slightly outpaces in-plane cooling in 5 ML NPLs with recrystallization occurring on indistinguishable time scales. In comparison, for zero-dimensional CdSe nanocrystals, disordering is isotropic and recovery is faster. These results favor the use of NPLs in optoelectronic applications, where they are likely to exhibit superior performance over traditional, zero-dimensional nanocrystals.
Metrics
Details
- Title
- Anisotropic Transient Disordering of Colloidal, Two-Dimensional CdSe Nanoplatelets upon Optical Excitation
- Creators
- Alexandra Brumberg - Northwestern UniversityMatthew S. Kirschner - Northwestern UniversityBenjamin T. Diroll - Argonne National LaboratoryKali R. Williams - Northwestern UniversityNathan C. Flanders - Northwestern UniversitySamantha M. Harvey - Northwestern UniversityAriel A. Leonard - Northwestern UniversityNicolas E. Watkins - Northwestern UniversityCunming Liu - Argonne National LaboratoryEli D. Kinigstein - Argonne National LaboratoryJin Yu - Argonne National LaboratoryAustin M. Evans - Northwestern UniversityYuzi Liu - Argonne National LaboratoryShelby A. Cuthriell - Northwestern UniversityShobhana Panuganti - Northwestern UniversityWilliam R. Dichtel - Northwestern UniversityMercouri G. Kanatzidis - Northwestern UniversityMichael R. Wasielewski - Northwestern UniversityXiaoyi Zhang - Argonne National LaboratoryLin X. Chen - Northwestern UniversityRichard D. Schaller - Northwestern UniversityArgonne National Lab. (ANL), Argonne, IL (United States)
- Publication Details
- Nano letters, v 21(3), pp 1288-1294
- Publisher
- Amer Chemical Soc
- Number of pages
- 7
- Grant note
- 1808590 / Direct For Mathematical & Physical Scien; Division Of Chemistry; National Science Foundation (NSF); NSF - Directorate for Mathematical & Physical Sciences (MPS) 1629383; 1808590 / National Science Foundation; National Science Foundation (NSF) DEAC02-06CH11357 / Ultrafast Initiative of the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, through Argonne National Laboratory; United States Department of Energy (DOE) E.I. DuPont de Nemours Co. 3M Graduate Research Fellowship; 3M 1629383 / Direct For Mathematical & Physical Scien; Division Of Materials Research; National Science Foundation (NSF); NSF - Directorate for Mathematical & Physical Sciences (MPS) DGE1842165 / National Science Foundation Graduate Research Fellowship Program; National Science Foundation (NSF) Northwestern University Dow Chemical Company DEFG02-99ER14999; DE-AC02-06CH11357 / U.S. Department of Energy, Office of Science, 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:000619638600013
- Scopus ID
- 2-s2.0-85100262558
- Other Identifier
- 991022053868904721
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