2D-materials, especially transition metal dichalcogenides (TMDs) have drawn a lot of attention due to their remarkable characteristics rendering them a promising candidate for optical applications. While the basic properties are understood up to now, the influence of the environment has not been studied in detail, yet. Here we highlight a systematic comparison of the optical properties of tungsten diselenide monolayers on different substrates. Subtle changes in the emission spectrum and Raman signature have been found as well as surprisingly pronounced differences in the pump-power-dependent and time-resolved output at higher excitation densities. For all samples, exciton-exciton annihilation can be obtained. Nevertheless an analysis of different pump-dependent decay rates suggests Acknowledgments The authors acknowledge financial support by the Philipps-Universitat Marburg, the German Research Foundation (DFG: SFB1083) and the German Academic Exchange Service (DAAD). Work at Columbia was funded by the NSF MRSEC under DMR-1420634.

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Дата начала обработки статистических данных - 27 января 2016 г.