Substrate engineering for high quality emission of free and localized excitons from atomic monolayers in hybrid architectures
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Atomic monolayers represent a novel class of materials to study localized and free excitons in two dimensions and to engineer optoelectronic devices based on their significant optical response. Here, we investigate the role of the substrate on the photoluminescense response of MoSe2 and WSe2 monolayers exfoliated either on SiO2 or epitaxially grown InGaP substrates. In the case of MoSe2, we observe a significant qualitative modification of the emission spectrum, which is widely dominated by the trion resonance on InGaP substrates. However, the effects of inhomogeneous broadening of the emission features are strongly reduced. Even more strikingly, in sheets of WSe2, we could routinely observe emission lines from localized excitons with linewidths down to the resolution limit of 70 μeV. This is in stark contrast to reference samples featuring WSe2 monolayers on SiO2 surfaces, where the emission spectra from localized defects are widely dominated by spectral diffusion and blinking behaviour. Our experiment outlines the enormous potential of III-V-monolayer hybrid architectures to obtain high quality emission signals from atomic monolayers, which are straight forward to integrate into nanophotonic and integrated optoelectronic devices.
Iff , O , He , Y-M , Lundt , N , Stoll , S , Stoll , S , Baumann , V , Höfling , S & Schneider , C 2017 , ' Substrate engineering for high quality emission of free and localized excitons from atomic monolayers in hybrid architectures ' Optica , vol. 4 , no. 6 , pp. 669-673 . DOI: 10.1364/OPTICA.4.000669
© 2017 Optical Society of America. This work has been made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at: https://doi.org/10.1364/OPTICA.4.000669
DescriptionWe acknowledge financial support by the State of Bavaria and the European Research Council (Project Unlimit-2D).
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