Black Phosphorus n-Type Doping by Cu: A Microscopic Surface Investigation

@article{Kumar2021BlackPN,
  title={Black Phosphorus n-Type Doping by Cu: A Microscopic Surface Investigation},
  author={Abhishek Kumar and Francesca Telesio and Deborah Prezzi and Claudia Cardoso and Alessandra Catellani and Stiven Forti and Camilla Coletti and Manuel Serrano−Ruiz and Maurizio Peruzzini and Fabio Beltram and Stefan Heun},
  journal={The Journal of Physical Chemistry C},
  year={2021}
}
We study surface charge transfer doping of exfoliated black phosphorus (bP) flakes by copper using scanning tunneling microscopy (STM) and spectroscopy (STS) at room temperature. The tunneling spectra reveal a gap in correspondence of Cu islands, which is attributed to Coulomb blockade phenomena. Moreover, using line spectroscopic measurements across small copper islands, we exploit the potential of the local investigation, showing that the n-type doping effect of copper on bP is short-ranged… 
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