Strain-Driven Stacking Faults in CdSe/CdS Core/Shell Nanorods

Demortiere, Arnaud; Leonard, Donovan N.; Petkov, Valeri; Chapman, Karena; Chattopadhyay, Soma; She, Chunxing; Cullen, David A.; Shibata, Tomohiro; Pelton, Matthew; Shevchenko, Elena V.

doi:10.1021/acs.jpclett.8b00914

Strain-Driven Stacking Faults in CdSe/CdS Core/Shell Nanorods

Journal Article · Wed Mar 28 00:00:00 EDT 2018 · Journal of Physical Chemistry Letters

DOI:https://doi.org/10.1021/acs.jpclett.8b00914· OSTI ID:1460204

Demortiere, Arnaud ^[1]; Leonard, Donovan N. ^[2]; ^[3]; ^[4]; Chattopadhyay, Soma ^[4]; She, Chunxing ^[5]; Cullen, David A. ^[2]; Shibata, Tomohiro ^[4]; ^[6]; ^[5]

Argonne National Lab. (ANL), Argonne, IL (United States). Center for Nanoscale Materials; Univ. Picardie Jules Verne, Amiens (France). Lab. de Reactivite et Chimie des Solides (LRCS); Réseau sur le Stockage Electrochimique de l’Energie (RS2E), Amiens (France)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division
Central Michigan Univ., Mount Pleasant, MI (United States). Dept. of Physics
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Argonne National Lab. (ANL), Argonne, IL (United States). Center for Nanoscale Materials
Argonne National Lab. (ANL), Argonne, IL (United States). Center for Nanoscale Materials; Univ. of Maryland, Baltimore, MD (United States). Dept. of Physics

Colloidal semiconductor nanocrystals are commonly grown with a shell of a second semiconductor material to obtain desired physical properties, such as increased photoluminescence quantum yield. However, the growth of a lattice-mismatched shell results in strain within the nanocrystal, and this strain has the potential to produce crystalline defects. Here in this paper, we study CdSe/CdS core/shell nanorods as a model system to investigate the influence of core size and shape on the formation of stacking faults in the nanocrystal. Using a combination of high-angle annular dark-field scanning transmission electron microscopy and pair-distribution-function analysis of synchrotron X-ray scattering, we show that growth of the CdS shell on smaller, spherical CdSe cores results in relatively small strain and few stacking faults. By contrast, growth of the shell on larger, prolate spheroidal cores leads to significant strain in the CdS lattice, resulting in a high density of stacking faults.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1460204

Journal Information:: Journal of Physical Chemistry Letters, Journal Name: Journal of Physical Chemistry Letters Journal Issue: 8 Vol. 9; ISSN 1948-7185

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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