Semiconductor-to-metal transition in the bulk of WSe2upon potassium intercalation

Research output: Contribution to journal › Research article › Contributed › peer-review

Contributors

  • Mushtaq Ahmad - , Leibniz Institute for Solid State and Materials Research Dresden, COMSATS University Islamabad (First author)
  • Eric Müller - , Leibniz Institute for Solid State and Materials Research Dresden (Author)
  • Carsten Habenicht - , Leibniz Institute for Solid State and Materials Research Dresden (Author)
  • Roman Schuster - , Leibniz Institute for Solid State and Materials Research Dresden (Author)
  • Martin Knupfer - , Leibniz Institute for Solid State and Materials Research Dresden (Author)
  • Bernd Büchner - , Leibniz Institute for Solid State and Materials Research Dresden (Last author)

Abstract

We present electron energy-loss spectroscopic measurements of potassium (K) intercalated tungsten diselenide (WSe2). After exposure of pristine WSe2 films to potassium, we observe a charge carrier plasmon excitation at about 0.97 eV, which indicates a semiconductor-to-metal transition. Our data reveal the formation of one particular doped K-WSe2 phase. A Kramers–Kronig analysis allows the determination of the dielectric function and the estimation of the composition of K0.6WSe2. Momentum dependent measurements reveal a substantial plasmon dispersion to higher energies.

Details

Original languageEnglish
Pages (from-to)165502
Number of pages5
JournalJournal of Physics: Condensed Matter
Volume29
Issue number16
Publication statusPublished - 21 Mar 2017
Peer-reviewedYes
Externally publishedYes

External IDs

Scopus 85016288239

Keywords