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Updated: Mar 7, 2026

Electric-field Control of Electronic States in WS2 Nanodevices by Electrolyte Gating
Published on: April 12, 2018
Semiconductor-to-metal transition in the bulk of WSe2 upon potassium intercalation
Mushtaq Ahmad1,2, Eric Müller1, Carsten Habenicht1
1IFW Dresden, D-01069 Dresden, Germany.
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.
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