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

ACS Nano
Justin C OndryA Paul Alivisatos

Abstract

Using in situ high-resolution TEM, we study the structure and dynamics of well-defined edge dislocations in imperfectly attached PbTe nanocrystals. 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. Finally, 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 impo...Continue Reading

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Citations

Dec 18, 2019·Nature Communications·Jiabin CuiUri Banin
Nov 12, 2020·Nanoscale Horizons : the Home for Rapid Reports of Exceptional Significance in Nanoscience and Nanotechnolgy·Yang LiuWanli Ma
Feb 13, 2021·Accounts of Chemical Research·Justin C Ondry, A Paul Alivisatos
Jan 19, 2021·Accounts of Chemical Research·Somnath KoleyUri Banin
Jun 18, 2018·ACS Omega·Priyadarshi RanjanMilko E van der Boom
Feb 20, 2019·Journal of the American Chemical Society·Matthew R HauwillerA Paul Alivisatos
Jun 8, 2019·Journal of the American Chemical Society·Marie JehanninHelmut Cölfen
Sep 11, 2019·ACS Nano·Arthur R C McCrayLena F Kourkoutis
Jan 15, 2021·ACS Nano·Michelle A SmeatonLena F Kourkoutis
Jan 25, 2020·ACS Applied Materials & Interfaces·Harshal AgrawalErik C Garnett
Nov 19, 2021·Journal of the American Chemical Society·Jiabin CuiUri Banin

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