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Optically tunable charge carrier injection in monolayer MoS2

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Abstract

We report on excitation laser power-dependent Raman and photoluminescence (PL) measurements on gold nanoparticles–monolayer MoS2 hybrid nanostructures. Excitation of localized surface plasmon resonances in gold nanoparticles and their subsequent non-radiative relaxation inject charge carriers (electrons) into the adjacent monolayer MoS2. Due to the non-centrosymmetric nature of monolayer MoS2, the localized electron doping induces lattice compression via inverse piezoelectric response. The resultant lattice distortion manifests as a shift as well as broadening of \({A}_{1g}(\Gamma )\) and \({E}_{2g}^{1}\left(\Gamma \right)\) MoS2 Raman modes. A splitting of \({E}_{2g}^{1}\left(\Gamma \right)\) mode is also observed. The PL spectra reveal power-dependent enhancement of trion feature, which again is a signature of an increasing electron doping. The observed effects are confirmed to be doping related as they are absent in monolayer MoS2 without gold nanoparticles. Our observations reveal that charge carrier injection is effectively controlled by varying the excitation laser power, which may aid in optically tuning physical response of MoS2 hybrid nanostructures and devices.

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Data availability

The data that support the findings of this study are available from the corresponding author upon reasonable request. No custom code has been used in this work.

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Acknowledgements

The authors acknowledge Sophisticated Analytical Instrument Facility (SAIF) and Centre for Research in Nanotechnology and Science (CRNTS) at IIT Bombay for providing synthesis and characterization facilities. They also acknowledge financial support from SERB, DST and Dhananjay Joshi Endowment Fund (IIT Bombay) to PV. They are grateful to other group members for their help.

Funding

This work was supported by Science and Engineering Board (SERB) and Department of Science and Technology (DST) under the project grant nos. CRG/2018/000157 and DST/TMD (EWO)/IC5-2018/05.

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Authors and Affiliations

  1. Department of Physics, Indian Institute of Technology Bombay, Mumbai, 400076, India

    Geeta Sharma, Shraddha M. Rao, Bhanu Pratap Singh & Parinda Vasa

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  1. Geeta Sharma
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Correspondence to Parinda Vasa.

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Sharma, G., Rao, S.M., Singh, B.P. et al. Optically tunable charge carrier injection in monolayer MoS2. Appl. Phys. A 126, 663 (2020). https://doi.org/10.1007/s00339-020-03839-1

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