Enhanced Charge Transport in Two-Dimensional Materials through Light-Matter Strong Coupling.
basic_science · Level V
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- Record sourced from PubMed, PMID 34347448.
- Also identified by DOI 10.1021/acsnano.1c04544.
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Abstract
Strong light-matter interaction of functional materials is emerging as a promising area of research. Recent experiments suggest that material properties like charge transport can be controlled by coupling to a vacuum electromagnetic field. Here, we explored the design of a Fabry-Perot cavity in a field-effect transistor configuration and studied the charge transport in two-dimensional materials. The optical and electrical measurements of strongly coupled WS<sub>2</sub> suggest an enhancement of electron transport at room temperature. Electron mobility is enhanced more than 50 times at ON resonance conditions. Similarly, <i>I</i><sub>on</sub>/<i>I</i><sub>off</sub> ratio of the device increased by 2 orders of magnitude without chemical modification of the active layer. Cavity tuning and coupling strength-dependent studies support the evidence of modifying the electronic properties of the coupled system. A clear correlation in the effective mass of the polaritonic state and Schottky barrier height indicates a collective nature of light-matter interaction.