Colloidal Single-Layer Quantum Dots with Lateral Confinement Effects on 2D Exciton

Ho Jin; Minji Ahn; Sohee Jeong; Jae Hyo Han; Dongwon Yoo; Dong Hee Son; Jinwoo Cheon

doi:10.1021/jacs.6b06972

Colloidal Single-Layer Quantum Dots with Lateral Confinement Effects on 2D Exciton

Ho Jin, Minji Ahn, Sohee Jeong, Jae Hyo Han, Dongwon Yoo, Dong Hee Son, Jinwoo Cheon

Department of Chemistry

Research output: Contribution to journal › Article › peer-review

42 Citations (Scopus)

Abstract

Controlled lateral quantum confinement in single-layer transition-metal chalcogenides (TMCs) can potentially combine the unique properties of two-dimensional (2D) exciton with the size-tunability of exciton energy, creating the single-layer quantum dots (SQDs) of 2D TMC materials. However, exploring such opportunities has been challenging due to the limited ability to produce well-defined SQDs with sufficiently high quality and size control, in conjunction with the commonly observed inconsistency in the optical properties. Here, we report an effective method to synthesize high-quality and size-controlled SQDs of WSe₂ via multilayer quantum dots (MQDs) precursors, which enables grasping a clear picture of the role of lateral confinement on the optical properties of the 2D exciton. From the single-particle optical spectra and polarization anisotropy of WSe₂ SQDs of varying sizes in addition to their ensemble data, we reveal how the properties of 2D exciton in single-layer TMCs evolve with increasing lateral quantum confinement.

Original language	English
Pages (from-to)	13253-13259
Number of pages	7
Journal	Journal of the American Chemical Society
Volume	138
Issue number	40
DOIs	https://doi.org/10.1021/jacs.6b06972
Publication status	Published - 2016 Oct 12

Bibliographical note

Funding Information:
This work was supported by the Institute for Basic Science (IBS-R026-D1), the Asian Office of Aerospace Research and Development (FA2386-14-1-0014), the Welch Foundation (grant no. A-1639), NSF (grant no. DMR-1404457), and S. J. Yoo for TEM analyses [KBSI-HVEM (JEM-ARM1300S)].

Publisher Copyright:
© 2016 American Chemical Society.

All Science Journal Classification (ASJC) codes

Catalysis
Chemistry(all)
Biochemistry
Colloid and Surface Chemistry

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10.1021/jacs.6b06972

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title = "Colloidal Single-Layer Quantum Dots with Lateral Confinement Effects on 2D Exciton",

abstract = "Controlled lateral quantum confinement in single-layer transition-metal chalcogenides (TMCs) can potentially combine the unique properties of two-dimensional (2D) exciton with the size-tunability of exciton energy, creating the single-layer quantum dots (SQDs) of 2D TMC materials. However, exploring such opportunities has been challenging due to the limited ability to produce well-defined SQDs with sufficiently high quality and size control, in conjunction with the commonly observed inconsistency in the optical properties. Here, we report an effective method to synthesize high-quality and size-controlled SQDs of WSe2 via multilayer quantum dots (MQDs) precursors, which enables grasping a clear picture of the role of lateral confinement on the optical properties of the 2D exciton. From the single-particle optical spectra and polarization anisotropy of WSe2 SQDs of varying sizes in addition to their ensemble data, we reveal how the properties of 2D exciton in single-layer TMCs evolve with increasing lateral quantum confinement.",

author = "Ho Jin and Minji Ahn and Sohee Jeong and Han, {Jae Hyo} and Dongwon Yoo and Son, {Dong Hee} and Jinwoo Cheon",

note = "Funding Information: This work was supported by the Institute for Basic Science (IBS-R026-D1), the Asian Office of Aerospace Research and Development (FA2386-14-1-0014), the Welch Foundation (grant no. A-1639), NSF (grant no. DMR-1404457), and S. J. Yoo for TEM analyses [KBSI-HVEM (JEM-ARM1300S)]. Publisher Copyright: {\textcopyright} 2016 American Chemical Society.",

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AU - Yoo, Dongwon

AU - Son, Dong Hee

AU - Cheon, Jinwoo

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PY - 2016/10/12

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N2 - Controlled lateral quantum confinement in single-layer transition-metal chalcogenides (TMCs) can potentially combine the unique properties of two-dimensional (2D) exciton with the size-tunability of exciton energy, creating the single-layer quantum dots (SQDs) of 2D TMC materials. However, exploring such opportunities has been challenging due to the limited ability to produce well-defined SQDs with sufficiently high quality and size control, in conjunction with the commonly observed inconsistency in the optical properties. Here, we report an effective method to synthesize high-quality and size-controlled SQDs of WSe2 via multilayer quantum dots (MQDs) precursors, which enables grasping a clear picture of the role of lateral confinement on the optical properties of the 2D exciton. From the single-particle optical spectra and polarization anisotropy of WSe2 SQDs of varying sizes in addition to their ensemble data, we reveal how the properties of 2D exciton in single-layer TMCs evolve with increasing lateral quantum confinement.

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Colloidal Single-Layer Quantum Dots with Lateral Confinement Effects on 2D Exciton

Abstract

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