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Title: Dislocation-driven growth of two-dimensional lateral quantum-well superlattices

Abstract

Here, the advent of two-dimensional (2D) materials has led to extensive studies of heterostructures for novel applications. 2D lateral multiheterojunctions and superlattices have been recently demonstrated, but the available growth methods can only produce features with widths in the micrometer or, at best, 100-nm scale and usually result in rough and defective interfaces with extensive chemical intermixing. Widths smaller than 5 nm, which are needed for quantum confinement effects and quantum-well applications, have not been achieved. We demonstrate the growth of sub–2-nm quantum-well arrays in semiconductor monolayers, driven by the climb of misfit dislocations in a lattice-mismatched sulfide/selenide heterointerface. Density functional theory calculations provide an atom-by-atom description of the growth mechanism. The calculated energy bands reveal type II alignment suitable for quantum wells, suggesting that the structure could, in principle, be turned into a “conduit” of conductive nanoribbons for interconnects in future 2D integrated circuits via n-type modulation doping. This misfit dislocation–driven growth can be applied to different combinations of 2D monolayers with lattice mismatch, paving the way to a wide range of 2D quantum-well superlattices with controllable band alignment and nanoscale width.

Authors:
ORCiD logo [1]; ORCiD logo [2];  [3];  [4]; ORCiD logo [5]; ORCiD logo [5]; ORCiD logo [6]; ORCiD logo [2]; ORCiD logo [3]
  1. Univ. of Chinese Academy of Science, Beijing (China); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Univ. of Chinese Academy of Science, Beijing (China); Vanderbilt Univ., Nashville, TN (United States)
  3. National Univ. of Singapore (Singapore)
  4. Univ. of Chinese Academy of Science, Beijing (China)
  5. Nanyang Technological Univ. (Singapore)
  6. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1456787
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Science Advances
Additional Journal Information:
Journal Volume: 4; Journal Issue: 3; Journal ID: ISSN 2375-2548
Publisher:
AAAS
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Zhou, Wu, Zhang, Yu -Yang, Chen, Jianyi, Li, Dongdong, Zhou, Jiadong, Liu, Zheng, Chisholm, Matthew F., Pantelides, Sokrates T., and Loh, Kian Ping. Dislocation-driven growth of two-dimensional lateral quantum-well superlattices. United States: N. p., 2018. Web. doi:10.1126/sciadv.aap9096.
Zhou, Wu, Zhang, Yu -Yang, Chen, Jianyi, Li, Dongdong, Zhou, Jiadong, Liu, Zheng, Chisholm, Matthew F., Pantelides, Sokrates T., & Loh, Kian Ping. Dislocation-driven growth of two-dimensional lateral quantum-well superlattices. United States. doi:10.1126/sciadv.aap9096.
Zhou, Wu, Zhang, Yu -Yang, Chen, Jianyi, Li, Dongdong, Zhou, Jiadong, Liu, Zheng, Chisholm, Matthew F., Pantelides, Sokrates T., and Loh, Kian Ping. Fri . "Dislocation-driven growth of two-dimensional lateral quantum-well superlattices". United States. doi:10.1126/sciadv.aap9096. https://www.osti.gov/servlets/purl/1456787.
@article{osti_1456787,
title = {Dislocation-driven growth of two-dimensional lateral quantum-well superlattices},
author = {Zhou, Wu and Zhang, Yu -Yang and Chen, Jianyi and Li, Dongdong and Zhou, Jiadong and Liu, Zheng and Chisholm, Matthew F. and Pantelides, Sokrates T. and Loh, Kian Ping},
abstractNote = {Here, the advent of two-dimensional (2D) materials has led to extensive studies of heterostructures for novel applications. 2D lateral multiheterojunctions and superlattices have been recently demonstrated, but the available growth methods can only produce features with widths in the micrometer or, at best, 100-nm scale and usually result in rough and defective interfaces with extensive chemical intermixing. Widths smaller than 5 nm, which are needed for quantum confinement effects and quantum-well applications, have not been achieved. We demonstrate the growth of sub–2-nm quantum-well arrays in semiconductor monolayers, driven by the climb of misfit dislocations in a lattice-mismatched sulfide/selenide heterointerface. Density functional theory calculations provide an atom-by-atom description of the growth mechanism. The calculated energy bands reveal type II alignment suitable for quantum wells, suggesting that the structure could, in principle, be turned into a “conduit” of conductive nanoribbons for interconnects in future 2D integrated circuits via n-type modulation doping. This misfit dislocation–driven growth can be applied to different combinations of 2D monolayers with lattice mismatch, paving the way to a wide range of 2D quantum-well superlattices with controllable band alignment and nanoscale width.},
doi = {10.1126/sciadv.aap9096},
journal = {Science Advances},
number = 3,
volume = 4,
place = {United States},
year = {Fri Mar 23 00:00:00 EDT 2018},
month = {Fri Mar 23 00:00:00 EDT 2018}
}

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