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Title: Dynamics and Removal Pathway of Edge Dislocations in Imperfectly Attached PbTe Nanocrystal Pairs: Toward Design Rules for Oriented Attachment

Abstract

Using in situ high-resolution TEM, we study the structure and dynamics of well-defined edge dislocations in imperfectly attached PbTe nanocrystals. In this work, we identify that attachment of PbTe nanocrystals on both {100} and {110} facets gives rise to b = a/2⟨110⟩ edge dislocations. Based on the Burgers vector of individual dislocations, we can identify the glide plane of the dislocations. We observe that defects in particles attached on {100} facets have glide planes that quickly intersect the surface, and HRTEM movies show that the defects follow the glide plane to the surface. For {110} attached particles, the glide plane is collinear with the attachment direction, which does not provide an easy path for the dislocation to reach the surface. Indeed, HRTEM movies of dislocations for {110} attached particles show that defect removal is much slower. Further, we observe conversion from pure edge dislocations in imperfectly attached particles to dislocations with mixed edge and screw character, which has important implications for crystal growth. Lastly, we observe that dislocations initially closer to the surface have a higher speed of removal, consistent with the strong dislocation free surface attractive force. Our results provide important design rules for defect-free attachment of preformed nanocrystalsmore » into epitaxial assemblies.« less

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [2]
+ Show Author Affiliations
  1. Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  2. Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Kavli Energy NanoScience Institute, Berkeley, CA (United States)
Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
OSTI Identifier:
1532310
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
ACS Nano
Additional Journal Information:
Journal Volume: 12; Journal Issue: 4; Journal ID: ISSN 1936-0851
Publisher:
American Chemical Society (ACS)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; 36 MATERIALS SCIENCE; nanocrystals; oriented attachment; dislocations; PbTe; self-assembly; in situ TEM

Citation Formats

Ondry, Justin C., Hauwiller, Matthew R., and Alivisatos, A. Paul. Dynamics and Removal Pathway of Edge Dislocations in Imperfectly Attached PbTe Nanocrystal Pairs: Toward Design Rules for Oriented Attachment. United States: N. p., 2018. Web. doi:10.1021/acsnano.8b00638.
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Ondry, Justin C., Hauwiller, Matthew R., & Alivisatos, A. Paul. Dynamics and Removal Pathway of Edge Dislocations in Imperfectly Attached PbTe Nanocrystal Pairs: Toward Design Rules for Oriented Attachment. United States. https://doi.org/10.1021/acsnano.8b00638
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Ondry, Justin C., Hauwiller, Matthew R., and Alivisatos, A. Paul. Thu . "Dynamics and Removal Pathway of Edge Dislocations in Imperfectly Attached PbTe Nanocrystal Pairs: Toward Design Rules for Oriented Attachment". United States. https://doi.org/10.1021/acsnano.8b00638. https://www.osti.gov/servlets/purl/1532310.
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@article{osti_1532310,
title = {Dynamics and Removal Pathway of Edge Dislocations in Imperfectly Attached PbTe Nanocrystal Pairs: Toward Design Rules for Oriented Attachment},
author = {Ondry, Justin C. and Hauwiller, Matthew R. and Alivisatos, A. Paul},
abstractNote = {Using in situ high-resolution TEM, we study the structure and dynamics of well-defined edge dislocations in imperfectly attached PbTe nanocrystals. In this work, we identify that attachment of PbTe nanocrystals on both {100} and {110} facets gives rise to b = a/2⟨110⟩ edge dislocations. Based on the Burgers vector of individual dislocations, we can identify the glide plane of the dislocations. We observe that defects in particles attached on {100} facets have glide planes that quickly intersect the surface, and HRTEM movies show that the defects follow the glide plane to the surface. For {110} attached particles, the glide plane is collinear with the attachment direction, which does not provide an easy path for the dislocation to reach the surface. Indeed, HRTEM movies of dislocations for {110} attached particles show that defect removal is much slower. Further, we observe conversion from pure edge dislocations in imperfectly attached particles to dislocations with mixed edge and screw character, which has important implications for crystal growth. Lastly, we observe that dislocations initially closer to the surface have a higher speed of removal, consistent with the strong dislocation free surface attractive force. Our results provide important design rules for defect-free attachment of preformed nanocrystals into epitaxial assemblies.},
doi = {10.1021/acsnano.8b00638},
journal = {ACS Nano},
number = 4,
volume = 12,
place = {United States},
year = {Thu Feb 22 00:00:00 EST 2018},
month = {Thu Feb 22 00:00:00 EST 2018}
}
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https://doi.org/10.1021/acsnano.8b00638
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Course materials and datasets for the Alivisatos group-based undergraduate research program
other, January 2021

Course materials and datasets for the Alivisatos group-based undergraduate research program
dataset, January 2021

In Situ Transmission Electron Microscopy Data of Dislocations in Imperfectly Attached PbTe Nanocrystal Pairs
dataset, January 2018

  • Ondry, Justin; Hauwiller, Matthew; Alivisatos, A. Paul
  • UC Berkeley
  • DOI: 10.6078/d17675

Course materials and datasets for the Alivisatos group-based undergraduate research program
dataset, January 2021

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    Works referencing / citing this record:

    Hybrid Growth Modes of PbSe Nanocrystals with Oriented Attachment and Grain Boundary Migration
    journal, February 2019

    Colloidal quantum dot molecules manifesting quantum coupling at room temperature
    journal, December 2019

    In Situ Transmission Electron Microscopy Data of Dislocations in Imperfectly Attached PbTe Nanocrystal Pairs
    dataset, January 2018

    • Ondry, Justin; Hauwiller, Matthew; Alivisatos, A. Paul
    • UC Berkeley
    • DOI: 10.6078/d17675

    Course materials and datasets for the Alivisatos group-based undergraduate research program
    other, January 2021

    Course materials and datasets for the Alivisatos group-based undergraduate research program
    dataset, January 2021

    Course materials and datasets for the Alivisatos group-based undergraduate research program
    other, January 2021

    In Situ Transmission Electron Microscopy Data of Dislocations in Imperfectly Attached PbTe Nanocrystal Pairs
    dataset, January 2018

    • Ondry, Justin; Hauwiller, Matthew; Alivisatos, A. Paul
    • UC Berkeley
    • DOI: 10.6078/d17675

    Course materials and datasets for the Alivisatos group-based undergraduate research program
    dataset, January 2021

    Hybrid Growth Modes of PbSe Nanocrystals with Oriented Attachment and Grain Boundary Migration
    journal, February 2019

    Metallic Nanocrystal Ripening on Inorganic Surfaces
    journal, June 2018

    • Ranjan, Priyadarshi; Kaplan-Ashiri, Ifat; Popovitz-Biro, Ronit
    • ACS Omega, Vol. 3, Issue 6
    • DOI: 10.1021/acsomega.8b00779

    Colloidal quantum dot molecules manifesting quantum coupling at room temperature
    journal, December 2019

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