Dynamic deformability of individual PbSe nanocrystals during superlattice phase transitions

Wang, Yu; Peng, Xinxing; Abelson, Alex; Xiao, Penghao; Qian, Caroline; Yu, Lei; Ophus, Colin; Ercius, Peter; Wang, Lin -Wang; Law, Matt; Zheng, Haimei

doi:10.1126/sciadv.aaw5623

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

Journal Article · 07 June 2019 · Science Advances

DOI: https://doi.org/10.1126/sciadv.aaw5623 · OSTI ID:1542414

^[1];

^[2]; Abelson, Alex ^[3]; Xiao, Penghao ^[4]; Qian, Caroline ^[3];

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^[4]; Law, Matt ^[3];

^[1]

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 (People's Republic of China)
Univ. of California, Irvine, CA (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

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.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Scientific User Facilities Division

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1542414

Journal Information:: Science Advances, Journal Name: Science Advances Journal Issue: 6 Vol. 5; ISSN 2375-2548

Publisher:: AAASCopyright Statement

Country of Publication:: United States

Language:: English

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