Revealing the preferred interlayer orientations and stackings of two-dimensional bilayer gallium selenide crystals
Abstract
Characterizing and controlling the interlayer orientations and stacking order of bilayer two-dimensional (2D) crystals and van der Waals (vdW) heterostructure is crucial to optimize their electrical and optoelectronic properties. The four polymorphs of layered gallium selenide (GaSe) that result from different layer stacking provide an ideal platform to study the stacking configurations in bilayer 2D crystals. Here, through a controllable vapor-phase deposition method we selectively grow bilayer GaSe crystals and investigate their two preferred 0° or 60° interlayer rotations. The commensurate stacking configurations (AA' and AB-stacking) in as-grown 2D bilayer GaSe crystals are clearly observed at the atomic scale and the Ga-terminated edge structure are identified for the first time by using atomic-resolution scanning transmission electron microscopy (STEM). Theoretical analysis of the interlayer coupling energetics vs. interlayer rotation angle reveals that the experimentally-observed orientations are energetically preferred among the bilayer GaSe crystal polytypes. Here, the combined experimental and theoretical characterization of the GaSe bilayers afforded by these growth studies provide a pathway to reveal the atomistic relationships in interlayer orientations responsible for the electronic and optical properties of bilayer 2D crystals and vdW heterostructures.
- Authors:
-
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Escuela Politecnica Nacional, Quito (Ecuador)
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
- Sponsoring Org.:
- USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE Office of Science (SC)
- OSTI Identifier:
- 1185701
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Angewandte Chemie (International Edition)
- Additional Journal Information:
- Journal Name: Angewandte Chemie (International Edition); Journal Volume: 54; Journal Issue: 9; Journal ID: ISSN 1433-7851
- Publisher:
- Wiley
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; gallium selenide; monolayer; interlayer orientation; stacking; vapour-phase deposition
Citation Formats
Li, Xufan, Basile Carrasco, Leonardo A., Yoon, Mina, Ma, Cheng, Puretzky, Alexander A., Lee, Jaekwang, Idrobo Tapia, Juan Carlos, Chi, Miaofang, Rouleau, Christopher M., Geohegan, David B., and Xiao, Kai. Revealing the preferred interlayer orientations and stackings of two-dimensional bilayer gallium selenide crystals. United States: N. p., 2015.
Web. doi:10.1002/anie.201409743.
Li, Xufan, Basile Carrasco, Leonardo A., Yoon, Mina, Ma, Cheng, Puretzky, Alexander A., Lee, Jaekwang, Idrobo Tapia, Juan Carlos, Chi, Miaofang, Rouleau, Christopher M., Geohegan, David B., & Xiao, Kai. Revealing the preferred interlayer orientations and stackings of two-dimensional bilayer gallium selenide crystals. United States. https://doi.org/10.1002/anie.201409743
Li, Xufan, Basile Carrasco, Leonardo A., Yoon, Mina, Ma, Cheng, Puretzky, Alexander A., Lee, Jaekwang, Idrobo Tapia, Juan Carlos, Chi, Miaofang, Rouleau, Christopher M., Geohegan, David B., and Xiao, Kai. Wed .
"Revealing the preferred interlayer orientations and stackings of two-dimensional bilayer gallium selenide crystals". United States. https://doi.org/10.1002/anie.201409743. https://www.osti.gov/servlets/purl/1185701.
@article{osti_1185701,
title = {Revealing the preferred interlayer orientations and stackings of two-dimensional bilayer gallium selenide crystals},
author = {Li, Xufan and Basile Carrasco, Leonardo A. and Yoon, Mina and Ma, Cheng and Puretzky, Alexander A. and Lee, Jaekwang and Idrobo Tapia, Juan Carlos and Chi, Miaofang and Rouleau, Christopher M. and Geohegan, David B. and Xiao, Kai},
abstractNote = {Characterizing and controlling the interlayer orientations and stacking order of bilayer two-dimensional (2D) crystals and van der Waals (vdW) heterostructure is crucial to optimize their electrical and optoelectronic properties. The four polymorphs of layered gallium selenide (GaSe) that result from different layer stacking provide an ideal platform to study the stacking configurations in bilayer 2D crystals. Here, through a controllable vapor-phase deposition method we selectively grow bilayer GaSe crystals and investigate their two preferred 0° or 60° interlayer rotations. The commensurate stacking configurations (AA' and AB-stacking) in as-grown 2D bilayer GaSe crystals are clearly observed at the atomic scale and the Ga-terminated edge structure are identified for the first time by using atomic-resolution scanning transmission electron microscopy (STEM). Theoretical analysis of the interlayer coupling energetics vs. interlayer rotation angle reveals that the experimentally-observed orientations are energetically preferred among the bilayer GaSe crystal polytypes. Here, the combined experimental and theoretical characterization of the GaSe bilayers afforded by these growth studies provide a pathway to reveal the atomistic relationships in interlayer orientations responsible for the electronic and optical properties of bilayer 2D crystals and vdW heterostructures.},
doi = {10.1002/anie.201409743},
journal = {Angewandte Chemie (International Edition)},
number = 9,
volume = 54,
place = {United States},
year = {Wed Jan 21 00:00:00 EST 2015},
month = {Wed Jan 21 00:00:00 EST 2015}
}
Web of Science
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