Nanoshell quantum dots: Quantum confinement beyond the exciton Bohr radius

Cassidy, James; Zamkov, Mikhail

doi:10.1063/1.5126423

Title: Nanoshell quantum dots: Quantum confinement beyond the exciton Bohr radius

Journal Article · Sat Mar 21 00:00:00 EDT 2020 · Journal of Chemical Physics

DOI:https://doi.org/10.1063/1.5126423· OSTI ID:1803092

Cassidy, James ^[1];

^[1]

Bowling Green State University, OH (United States). The Center for Photochemical Sciences

Nanoshell quantum dots (QDs) represent a novel class of colloidal semiconductor nanocrystals (NCs), which supports tunable optoelectronic properties over the extended range of particle sizes. Traditionally, the ability to control the bandgap of colloidal semiconductor NCs is limited to small-size nanostructures, where photoinduced charges are confined by Coulomb interactions. A notorious drawback of such a restricted size range concerns the fact that assemblies of smaller nanoparticles tend to exhibit a greater density of interfacial and surface defects. This presents a potential problem for device applications of semiconductor NCs where the charge transport across nanoparticle films is important, as in the case of solar cells, field-effect transistors, and photoelectrochemical devices. Furthermore, the morphology of nanoshell QDs addresses this issue by enabling the quantum-confinement in the shell layer, where two-dimensional excitons can exist, regardless of the total particle size. Such a geometry exhibits one of the lowest surface-to-volume ratios among existing QD architectures and, therefore, could potentially lead to improved charge-transport and multi-exciton characteristics. The expected benefits of the nanoshell architecture were recently demonstrated by a number of reports on the CdS_bulk/CdSe nanoshell model system, showing an improved photoconductivity of solids and increased lifetime of multi-exciton populations. Along these lines, this perspective will summarize the recent work on CdS_bulk/CdSe nanoshell colloids and discuss the possibility of employing other nanoshell semiconductor combinations in light-harvesting and lasing applications.

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

Sponsoring Organization:: USDOE Office of Science (SC); National Science Foundation (NSF)

Grant/Contract Number:: SC0016872; DMR-1710063; SC0026872 (MZ)

OSTI ID:: 1803092

Alternate ID(s):: OSTI ID: 1604830

Journal Information:: Journal of Chemical Physics, Vol. 152, Issue 11; ISSN 0021-9606

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 21 works

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Variation of the Thickness and Number of Wells in the CdS/HgS/CdS Quantum Dot Quantum Well System ^† Braun, Markus; Burda, Clemens; El-Sayed, Mostafa A. The Journal of Physical Chemistry A, Vol. 105, Issue 23 https://doi.org/10.1021/jp010002l	journal	June 2001
Direct observation of triplet energy transfer from semiconductor nanocrystals Mongin, C.; Garakyaraghi, S.; Razgoniaeva, N. Science, Vol. 351, Issue 6271 https://doi.org/10.1126/science.aad6378	journal	January 2016
Synthesis and Micrometer-Scale Assembly of Colloidal CdSe/CdS Nanorods Prepared by a Seeded Growth Approach Carbone, Luigi; Nobile, Concetta; De Giorgi, Milena Nano Letters, Vol. 7, Issue 10 https://doi.org/10.1021/nl0717661	journal	October 2007
Understanding and Exploiting the Interface of Semiconductor Nanocrystals for Light Emissive Applications Kambhampati, Patanjali; Mack, Timothy; Jethi, Lakshay ACS Photonics, Vol. 4, Issue 3 https://doi.org/10.1021/acsphotonics.6b00951	journal	February 2017
Single Dot Spectroscopy of Two-Color Quantum Dot/Quantum Shell Nanostructures Dias, Eva A.; Grimes, Amy F.; English, Douglas S. The Journal of Physical Chemistry C, Vol. 112, Issue 37 https://doi.org/10.1021/jp806621q	journal	July 2008
Tailoring the Inherent Optical and Electrical Properties of Nanostructures Kuno, Masaru The Journal of Physical Chemistry Letters, Vol. 5, Issue 21 https://doi.org/10.1021/jz502041a	journal	October 2014

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
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