One-Dimensional Carrier Confinement in “Giant” CdS/CdSe Excitonic Nanoshells

Razgoniaeva, Natalia; Moroz, Pavel; Yang, Mingrui; Budkina, Darya S.; Eckard, Holly; Augspurger, Marissa; Khon, Dmitriy; Tarnovsky, Alexander N.; Zamkov, Mikhail

doi:10.1021/jacs.7b02054

Title: One-Dimensional Carrier Confinement in “Giant” CdS/CdSe Excitonic Nanoshells

Abstract

Here, the emerging generation of quantum dot optoelectronic devices offers an appealing prospect of a size-tunable band gap. The confinement-enabled control over electronic properties, however, requires nanoparticles to be sufficiently small, which leads to a large area of interparticle boundaries in a film. Such interfaces lead to a high density of surface traps which ultimately increase the electrical resistance of a solid. To address this issue, we have developed an inverse energy-gradient core/shell architecture supporting the quantum confinement in nanoparticles larger than the exciton Bohr radius. The assembly of such nanostructures exhibits a relatively low surface-to-volume ratio, which was manifested in this work through the enhanced conductance of solution-processed films. The reported core/shell geometry was realized by growing a narrow gap semiconductor layer (CdSe) on the surface of a wide-gap core material (CdS) promoting the localization of excitons in the shell domain, as was confirmed by ultrafast transient absorption and emission lifetime measurements. The band gap emission of fabricated nanoshells, ranging from 15 to 30 nm in diameter, has revealed a characteristic size-dependent behavior tunable via the shell thickness with associated quantum yields in the 4.4–16.0% range.

Authors:

Razgoniaeva, Natalia; Moroz, Pavel; Yang, Mingrui; Budkina, Darya S.; Eckard, Holly; Augspurger, Marissa ^[1]; Khon, Dmitriy ^[1]; Tarnovsky, Alexander N.;

Department of Chemistry and Biochemistry, St. Mary’s University, San Antonio, Texas 78228, United States

Publication Date:: 2017-06-05

Research Org.:: Bowling Green State Univ., Bowling Green, OH (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

OSTI Identifier:: 1361222

Alternate Identifier(s):: OSTI ID: 1372222

Grant/Contract Number:: SC0016872

Resource Type:: Published Article

Journal Name:: Journal of the American Chemical Society

Additional Journal Information:: Journal Name: Journal of the American Chemical Society Journal Volume: 139 Journal Issue: 23; Journal ID: ISSN 0002-7863

Publisher:: American Chemical Society

Country of Publication:: United States

Language:: English

Subject:: 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; 77 NANOSCIENCE AND NANOTECHNOLOGY

Citation Formats


                    Razgoniaeva, Natalia, Moroz, Pavel, Yang, Mingrui, Budkina, Darya S., Eckard, Holly, Augspurger, Marissa, Khon, Dmitriy, Tarnovsky, Alexander N., and Zamkov, Mikhail. One-Dimensional Carrier Confinement in “Giant” CdS/CdSe Excitonic Nanoshells.  United States: N. p., 2017. 
Web.  doi:10.1021/jacs.7b02054.

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                    Razgoniaeva, Natalia, Moroz, Pavel, Yang, Mingrui, Budkina, Darya S., Eckard, Holly, Augspurger, Marissa, Khon, Dmitriy, Tarnovsky, Alexander N., & Zamkov, Mikhail. One-Dimensional Carrier Confinement in “Giant” CdS/CdSe Excitonic Nanoshells.  United States.  https://doi.org/10.1021/jacs.7b02054

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                    Razgoniaeva, Natalia, Moroz, Pavel, Yang, Mingrui, Budkina, Darya S., Eckard, Holly, Augspurger, Marissa, Khon, Dmitriy, Tarnovsky, Alexander N., and Zamkov, Mikhail. Mon .  
"One-Dimensional Carrier Confinement in “Giant” CdS/CdSe Excitonic Nanoshells".  United States.  https://doi.org/10.1021/jacs.7b02054.

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@article{osti_1361222,

  title        = {One-Dimensional Carrier Confinement in “Giant” CdS/CdSe Excitonic Nanoshells},

  author       = {Razgoniaeva, Natalia and Moroz, Pavel and Yang, Mingrui and Budkina, Darya S. and Eckard, Holly and Augspurger, Marissa and Khon, Dmitriy and Tarnovsky, Alexander N. and Zamkov, Mikhail},

  abstractNote = {Here, the emerging generation of quantum dot optoelectronic devices offers an appealing prospect of a size-tunable band gap. The confinement-enabled control over electronic properties, however, requires nanoparticles to be sufficiently small, which leads to a large area of interparticle boundaries in a film. Such interfaces lead to a high density of surface traps which ultimately increase the electrical resistance of a solid. To address this issue, we have developed an inverse energy-gradient core/shell architecture supporting the quantum confinement in nanoparticles larger than the exciton Bohr radius. The assembly of such nanostructures exhibits a relatively low surface-to-volume ratio, which was manifested in this work through the enhanced conductance of solution-processed films. The reported core/shell geometry was realized by growing a narrow gap semiconductor layer (CdSe) on the surface of a wide-gap core material (CdS) promoting the localization of excitons in the shell domain, as was confirmed by ultrafast transient absorption and emission lifetime measurements. The band gap emission of fabricated nanoshells, ranging from 15 to 30 nm in diameter, has revealed a characteristic size-dependent behavior tunable via the shell thickness with associated quantum yields in the 4.4–16.0% range.},

  doi          = {10.1021/jacs.7b02054},

  journal      = {Journal of the American Chemical Society},

  number       = 23,

  volume       = 139,

  place        = {United States},

  year         = {2017},

  month        = {6}

}

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Works referencing / citing this record:

Optoelectronic Properties in Near-Infrared Colloidal Heterostructured Pyramidal “Giant” Core/Shell Quantum Dots
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Tong, Xin; Kong, Xiang-Tian; Wang, Chao
Advanced Science, Vol. 5, Issue 8
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Hydrothermal synthesis of ZnSe:Mn quantum dots and their optical properties
journal, February 2019

Nishimura, Hisaaki; Lin, Yuxin; Hizume, Masayuki
AIP Advances, Vol. 9, Issue 2
DOI: 10.1063/1.5085814

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Title: One-Dimensional Carrier Confinement in “Giant” CdS/CdSe Excitonic Nanoshells

Abstract

Citation Formats

Optoelectronic Properties in Near-Infrared Colloidal Heterostructured Pyramidal “Giant” Core/Shell Quantum Dots journal, July 2018

Hydrothermal synthesis of ZnSe:Mn quantum dots and their optical properties journal, February 2019

Optoelectronic Properties in Near-Infrared Colloidal Heterostructured Pyramidal “Giant” Core/Shell Quantum Dots
journal, July 2018

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journal, February 2019