Tailoring Transition Dipole Moment in Colloidal Nanocrystal Thin Film on Nanocomposite Materials

Kwang Jin Lee, Gahyeon Kim, Joonhyung Lim, Sanghee Nah, Kwang Seob Jeong, Minhaeng Cho

Research output: Contribution to journalArticlepeer-review

Abstract

Controlling the transition dipole moment is extremely important for various photophysical characteristics in semiconductors. Especially, suppression of Auger recombination in quantum dots (QDs) is essential for the development of novel applications, including bioimaging, lasing, and optoelectronic devices. To date, most of the studies on the Auger process are conducted on the basis of manipulating the material property such as wavefunction of electron and hole, energy band, and confinement potential. However, a new way of tuning the Auger process using nanocomposite materials is not reported. In this work, the biexciton Auger recombination (BAR) process in CdSe/CdS(1 ML) nanocrystal thin-film is successfully controlled by introducing nanocomposite materials. Performing pump intensity-dependent transient absorption experiments, a significant reduction (up to 30%) of BAR rate is observed in the presence of nanocomposite structures. This notable suppression effect is attributed to the modulation of the net transition dipole moment. These findings will provide further insight into the rational design of QDs combining with a nanostructure that efficiently suppresses Auger recombination rates.

Original languageEnglish
Article number2102050
JournalAdvanced Optical Materials
Volume10
Issue number4
DOIs
Publication statusPublished - 2022 Feb 18

Keywords

  • Auger process
  • colloidal quantum dots
  • image dipole

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics

Fingerprint

Dive into the research topics of 'Tailoring Transition Dipole Moment in Colloidal Nanocrystal Thin Film on Nanocomposite Materials'. Together they form a unique fingerprint.

Cite this