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Title: Dynamic deformability of individual PbSe nanocrystals during superlattice phase transitions

Abstract

The behavior of individual nanocrystals during superlattice phase transitions can profoundly affect the structural perfection and electronic properties of the resulting superlattices. However, details of nanocrystal morphological changes during superlattice phase transitions are largely unknown due to the lack of direct observation. Here, we report the dynamic deformability of PbSe semiconductor nanocrystals during superlattice phase transitions that are driven by ligand displacement. Real-time high-resolution imaging with liquid-phase transmission electron microscopy reveals that following ligand removal, the individual PbSe nanocrystals experience drastic directional shape deformation when the spacing between nanocrystals reaches 2 to 4 nm. The deformation can be completely recovered when two nanocrystals move apart or it can be retained when they attach. The large deformation, which is responsible for the structural defects in the epitaxially fused nanocrystal superlattice, may arise from internanocrystal dipole–dipole interactions.

Authors:
ORCiD logo [1]; ORCiD logo [2];  [3];  [4];  [3]; ORCiD logo [1]; ORCiD logo [4]; ORCiD logo [4]; ORCiD logo [4];  [3]; ORCiD logo [1]
  1. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States)
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Xiamen Univ., Xiamen (People's Republic of China)
  3. Univ. of California, Irvine, CA (United States)
  4. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Scientific User Facilities Division
OSTI Identifier:
1542414
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Science Advances
Additional Journal Information:
Journal Volume: 5; Journal Issue: 6; Journal ID: ISSN 2375-2548
Publisher:
AAAS
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Wang, Yu, Peng, Xinxing, Abelson, Alex, Xiao, Penghao, Qian, Caroline, Yu, Lei, Ophus, Colin, Ercius, Peter, Wang, Lin -Wang, Law, Matt, and Zheng, Haimei. Dynamic deformability of individual PbSe nanocrystals during superlattice phase transitions. United States: N. p., 2019. Web. doi:10.1126/sciadv.aaw5623.
Wang, Yu, Peng, Xinxing, Abelson, Alex, Xiao, Penghao, Qian, Caroline, Yu, Lei, Ophus, Colin, Ercius, Peter, Wang, Lin -Wang, Law, Matt, & Zheng, Haimei. Dynamic deformability of individual PbSe nanocrystals during superlattice phase transitions. United States. doi:10.1126/sciadv.aaw5623.
Wang, Yu, Peng, Xinxing, Abelson, Alex, Xiao, Penghao, Qian, Caroline, Yu, Lei, Ophus, Colin, Ercius, Peter, Wang, Lin -Wang, Law, Matt, and Zheng, Haimei. Fri . "Dynamic deformability of individual PbSe nanocrystals during superlattice phase transitions". United States. doi:10.1126/sciadv.aaw5623. https://www.osti.gov/servlets/purl/1542414.
@article{osti_1542414,
title = {Dynamic deformability of individual PbSe nanocrystals during superlattice phase transitions},
author = {Wang, Yu and Peng, Xinxing and Abelson, Alex and Xiao, Penghao and Qian, Caroline and Yu, Lei and Ophus, Colin and Ercius, Peter and Wang, Lin -Wang and Law, Matt and Zheng, Haimei},
abstractNote = {The behavior of individual nanocrystals during superlattice phase transitions can profoundly affect the structural perfection and electronic properties of the resulting superlattices. However, details of nanocrystal morphological changes during superlattice phase transitions are largely unknown due to the lack of direct observation. Here, we report the dynamic deformability of PbSe semiconductor nanocrystals during superlattice phase transitions that are driven by ligand displacement. Real-time high-resolution imaging with liquid-phase transmission electron microscopy reveals that following ligand removal, the individual PbSe nanocrystals experience drastic directional shape deformation when the spacing between nanocrystals reaches 2 to 4 nm. The deformation can be completely recovered when two nanocrystals move apart or it can be retained when they attach. The large deformation, which is responsible for the structural defects in the epitaxially fused nanocrystal superlattice, may arise from internanocrystal dipole–dipole interactions.},
doi = {10.1126/sciadv.aaw5623},
journal = {Science Advances},
number = 6,
volume = 5,
place = {United States},
year = {2019},
month = {6}
}

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