n-Doping of Quantum Dots by Lithium Ion Intercalation

Woo Je Chang, Kyu Young Park, Yizhou Zhu, Christopher Wolverton, Mark C. Hersam, Emily A. Weiss

Research output: Contribution to journalArticle

Abstract

The optical properties of colloidal quantum dots (QDs) are controllable through introduction of excess electrons or holes into their delocalized bands. Crucial to robust and energy-efficient electronic doping of QDs is suitable charge compensation. Compensation by surface modification and substitutional impurities are however not sufficiently controllable to enable effective doping of QDs. This article describes electrochemical n-type doping of CdSe QDs where injected electrons are compensated by interstitial Li+ to form LixCdSe, x ≤ 0.3. n-type degenerate doping reversibly decreases absorption into the lowest-energy excitonic state of the QD, activates intraband optical transitions, and shifts the photoluminescence of the QD to higher energy. This work establishes electrochemical interstitial doping as a reversible and highly controllable method for tuning the optical properties of colloidal QDs.

Original languageEnglish
Pages (from-to)36523-36529
Number of pages7
JournalACS applied materials & interfaces
Volume12
Issue number32
DOIs
Publication statusPublished - Aug 12 2020

Keywords

  • CdSe
  • electronic doping
  • interstitial doping
  • lithiation
  • optical spectra
  • quantum dot

ASJC Scopus subject areas

  • Materials Science(all)

Fingerprint Dive into the research topics of 'n-Doping of Quantum Dots by Lithium Ion Intercalation'. Together they form a unique fingerprint.

  • Cite this