Journal article
Bright Silicon Nanocrystals from a Liquid Precursor: Quasi-Direct Recombination with High Quantum Yield
ACS nano, v 14(4), pp 3858-3867
28 Apr 2020
PMID: 32150383
Abstract
Silicon nanocrystals (SiNCs) with bright bandgap photoluminescence (PL) are of current interest for a range of potential applications, from solar windows to biomedical contrast agents. Here, we use the liquid precursor cyclohexasilane (Si6H12) for the plasma synthesis of colloidal SiNCs with exemplary core emission. Through size separation executed in an oxygen-shielded environment, we achieve PL quantum yields (QYs) approaching 70% while exposing intrinsic constraints on efficient core emission from smaller SiNCs. Time-resolved PL spectra of these fractions in response to femtosecond pulsed excitation reveal a zero-phonon radiative channel that anticorrelates with QY, which we model using advanced computational methods applied to a 2 nm SiNC. Our results offer additional insight into the photophysical interplay of the nanocrystal surface, quasi-direct recombination, and efficient SiNC core PL.
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Details
- Title
- Bright Silicon Nanocrystals from a Liquid Precursor: Quasi-Direct Recombination with High Quantum Yield
- Creators
- Todd A. Pringle - North Dakota State UniversityKatharine Hunter - University of MinnesotaAlexandra Brumberg - Northwestern UniversityKenneth J. Anderson - North Dakota State UniversityJeffrey A. Fagan - National Institute of Standards and TechnologySalim A. Thomas - North Dakota State UniversityReed J. Petersen - North Dakota State UniversityMahmud Sefannaser - North Dakota State UniversityYulun Han - North Dakota State UniversitySamuel L. Brown - North Dakota State UniversityDmitri S. Kilin - North Dakota State UniversityRichard D. Schaller - Northwestern UniversityUwe R. Kortshagen - University of MinnesotaPhilip Raymond Boudjouk - North Dakota State UniversityErik K. Hobbie - North Dakota State UniversityArgonne National Lab. (ANL), Argonne, IL (United States)
- Publication Details
- ACS nano, v 14(4), pp 3858-3867
- Publisher
- Amer Chemical Soc
- Number of pages
- 10
- Grant note
- CBET-1603445 / National Science Foundation; National Science Foundation (NSF) CHE-1800476; OIA-1355466 / NSF; National Science Foundation (NSF) National Institute of Standards and Technology (NIST); National Institute of Standards & Technology (NIST) - USA DE-AC02-05CH11231 / DOE; United States Department of Energy (DOE) DGE-1324585; 00039202 / National Science Foundation Graduate Research Fellowship Program; National Science Foundation (NSF)
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Chemistry
- Web of Science ID
- WOS:000529895500011
- Scopus ID
- 2-s2.0-85084167130
- Other Identifier
- 991022053866304721
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