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

Research output: Contribution to journalArticlepeer-review

42 Citations (Scopus)


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 languageEnglish
Pages (from-to)13253-13259
Number of pages7
JournalJournal of the American Chemical Society
Issue number40
Publication statusPublished - 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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