Ultranarrow Mid-infrared Quantum Plasmon Resonance of Self-Doped Silver Selenide Nanocrystal

Haemin Song, Jin Hyeok Lee, So Young Eom, Dongsun Choi, Kwang Seob Jeong

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


The infrared quantum plasmon resonance (IR QPR) of nanocrystals (NCs) exhibits the combined properties of classical and quantum mechanics, potentially overcoming the limitations of conventional optical features. However, research on the development of localized surface plasmon resonance (LSPR) from colloidal quantum dots has stagnated, owing to the challenge of increasing the carrier density of semiconductor NCs. Herein, we present the mid-IR QPR of a self-doped Ag2Se NC with an exceptionally narrow bandwidth. Chemical modification of the NC surface with chloride realizes this narrow QPR bandwidth by achieving a high free-carrier density in the NC. The mid-IR QPR feature was thoroughly analyzed by using various experimental methods such as Fourier transform (FT) IR spectroscopy, X-ray photoelectron spectroscopy, and current-voltage measurements. In addition, the optical properties were theoretically analyzed using the plamon-in-a-box model and a modified hydrodynamic model that revealed the effect of coupling with the intraband transition and the limited nature of electron density in semiconductor NCs. Integrating the quantum effect into the plasmonic resonance reduces the peak bandwidth to 19.7 meV, which is an extremely narrow bandwidth compared with that of the LSPR of conventional metal oxide or metal chalcogenide NCs. Our results demonstrate that self-doped silver selenide quantum dots are excellent systems for studying mid-IR QPR.

Original languageEnglish
Pages (from-to)16895-16903
Number of pages9
JournalACS nano
Issue number17
Publication statusPublished - 2023 Sept 12

Bibliographical note

Funding Information:
This research was supported by Creative Materials Discovery Program (NRF-2019M3D1A1078299), the Nano & Material Technology Development Program (NRF-2021M3H4A3A01062964 and NRF-2022M3H4A1A03076626), and the Basic Science Research Program (NRF-2021R1A2C2092053) through the National Research Foundation of Korea (NRF) funded by the Ministry of Science and ICT.

Publisher Copyright:
© 2023 American Chemical Society.


  • Colloidal nanocrystals
  • Intraband transition
  • Midinfrared
  • Narrow bandwidth
  • Quantum plasmon resonance
  • Self-doping

ASJC Scopus subject areas

  • General Materials Science
  • General Engineering
  • General Physics and Astronomy


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