In situ TEM observation of neck formation during oriented attachment of PbSe nanocrystals
Abstract
Oriented attachment of nanocrystals is an important route to constructing epitaxially-connected nanocrystal superlattices for various applications. During oriented attachment of semiconductor nanocrystals, neck can be formed between nanocrystals and it strongly influences the properties of the resulting superlattice. However, the neck formation mechanism is poorly understood. Here, we use in situ liquid cell transmission electron microscopy to directly observe the initiation and growth of homoepitaxial necks between PbSe nanocrystals with atomic details. We find that neck initiation occurs slowly (~ 10 s) when two nanocrystals approach to each other within an edge-to-edge distance of 0.6 nm. During neck initiation, Pb and Se atoms defuse from other facets into the gap, forming “dynamic reversible” filaments. Once the filament (neck) width is larger than a critical size of 0.9 nm, it gradually (15 s) widens into a 3-nm-wide neck. The atomic structure of the neck is further obtained using ex situ aberration-corrected scanning TEM imaging. Neck initiation and growth mechanisms are elucidated with density functional theory calculations. As a result, our direct unveiling of the atomic pathways of neck formation during oriented attachment shed light into the fabrication of nanocrystal superlattices with improved structural order and electronic properties.
- Authors:
-
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States)
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Xiamen Univ., Xiamen (China)
- Univ. of California, Irvine, CA (United States)
- 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). Scientific User Facilities Division
- OSTI Identifier:
- 1563993
- Grant/Contract Number:
- AC02-05CH11231
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nano Research
- Additional Journal Information:
- Journal Volume: 12; Journal Issue: 10; Journal ID: ISSN 1998-0124
- Publisher:
- Springer
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 77 NANOSCIENCE AND NANOTECHNOLOGY; PbSe nanocrystals; quantum dots; superlattices; necking; oriented attachment; liquid cell transmission electron microscopy (TEM)
Citation Formats
Wang, Yu, Peng, Xinxing, Abelson, Alex, Zhang, Bing-Kai, Qian, Caroline, Ercius, Peter, Wang, Lin-Wang, Law, Matt, and Zheng, Haimei. In situ TEM observation of neck formation during oriented attachment of PbSe nanocrystals. United States: N. p., 2019.
Web. doi:10.1007/s12274-019-2483-8.
Wang, Yu, Peng, Xinxing, Abelson, Alex, Zhang, Bing-Kai, Qian, Caroline, Ercius, Peter, Wang, Lin-Wang, Law, Matt, & Zheng, Haimei. In situ TEM observation of neck formation during oriented attachment of PbSe nanocrystals. United States. https://doi.org/10.1007/s12274-019-2483-8
Wang, Yu, Peng, Xinxing, Abelson, Alex, Zhang, Bing-Kai, Qian, Caroline, Ercius, Peter, Wang, Lin-Wang, Law, Matt, and Zheng, Haimei. Mon .
"In situ TEM observation of neck formation during oriented attachment of PbSe nanocrystals". United States. https://doi.org/10.1007/s12274-019-2483-8. https://www.osti.gov/servlets/purl/1563993.
@article{osti_1563993,
title = {In situ TEM observation of neck formation during oriented attachment of PbSe nanocrystals},
author = {Wang, Yu and Peng, Xinxing and Abelson, Alex and Zhang, Bing-Kai and Qian, Caroline and Ercius, Peter and Wang, Lin-Wang and Law, Matt and Zheng, Haimei},
abstractNote = {Oriented attachment of nanocrystals is an important route to constructing epitaxially-connected nanocrystal superlattices for various applications. During oriented attachment of semiconductor nanocrystals, neck can be formed between nanocrystals and it strongly influences the properties of the resulting superlattice. However, the neck formation mechanism is poorly understood. Here, we use in situ liquid cell transmission electron microscopy to directly observe the initiation and growth of homoepitaxial necks between PbSe nanocrystals with atomic details. We find that neck initiation occurs slowly (~ 10 s) when two nanocrystals approach to each other within an edge-to-edge distance of 0.6 nm. During neck initiation, Pb and Se atoms defuse from other facets into the gap, forming “dynamic reversible” filaments. Once the filament (neck) width is larger than a critical size of 0.9 nm, it gradually (15 s) widens into a 3-nm-wide neck. The atomic structure of the neck is further obtained using ex situ aberration-corrected scanning TEM imaging. Neck initiation and growth mechanisms are elucidated with density functional theory calculations. As a result, our direct unveiling of the atomic pathways of neck formation during oriented attachment shed light into the fabrication of nanocrystal superlattices with improved structural order and electronic properties.},
doi = {10.1007/s12274-019-2483-8},
journal = {Nano Research},
number = 10,
volume = 12,
place = {United States},
year = {Mon Jul 29 00:00:00 EDT 2019},
month = {Mon Jul 29 00:00:00 EDT 2019}
}
Web of Science
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