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• W4378803205 endingPage "385703" @default.
• W4378803205 startingPage "385703" @default.
• W4378803205 abstract "Abstract Single layers of transition metal dichalcogenides (TMDCs), such as WSe 2 have gathered increasing attention due to their intense electron–hole interactions, being considered promising candidates for developing novel optical applications. Within the few-layer regime, these systems become highly sensitive to the surrounding environment, enabling the possibility of using a proper substrate to tune desired aspects of these atomically-thin semiconductors. In this scenario, the dielectric environment provided by the substrates exerts significant influence on electronic and optical properties of these layered materials, affecting the electronic band-gap and the exciton binding energy. However, the corresponding effect on the luminescence of TMDCs is still under discussion. To elucidate these impacts, we used a broad set of materials as substrates for single-layers of WSe 2 , enabling the observation of these effects over a wide range of electrical permittivities. Our results demonstrate that an increasing permittivity induces a systematic red-shift of the optical band-gap of WSe 2 , intrinsically related to a considerable reduction of the luminescence intensity. Moreover, we annealed the samples to ensure a tight coupling between WSe 2 and its substrates, reducing the effect of undesired adsorbates trapped in the interface. Ultimately, our findings reveal how critical the annealing temperature can be, indicating that above a certain threshold, the heating treatment can induce adverse impacts on the luminescence. Furthermore, our conclusions highlight the influence the dielectric properties of the substrate have on the luminescence of WSe 2 , showing that a low electrical permittivity favours preserving the native properties of the adjacent monolayer." @default.
• W4378803205 created "2023-06-01" @default.
• W4378803205 creator A5011377545 @default.
• W4378803205 creator A5035391927 @default.
• W4378803205 creator A5083160356 @default.
• W4378803205 creator A5092052659 @default.
• W4378803205 date "2023-07-06" @default.
• W4378803205 modified "2023-09-30" @default.
• W4378803205 title "Impacts of dielectric screening on the luminescence of monolayer WSe₂" @default.
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