Electron Doping of Ultrathin Black Phosphorus with Cu Adatoms

Koenig S.P.; Doganov R.A.; Seixas L.; Carvalho A.; Tan J.Y.; Watanabe K.; Taniguchi T.; Yakovlev N.; Castro Neto A.H.; Ozyilmaz B.

Electron Doping of Ultrathin Black Phosphorus with Cu Adatoms

Tipo

Artigo

Data de publicação

2016

Periódico

Nano Letters

Citações (Scopus)

197

Autores

Koenig S.P.
Doganov R.A.
Seixas L.
Carvalho A.
Tan J.Y.
Watanabe K.
Taniguchi T.
Yakovlev N.
Castro Neto A.H.
Ozyilmaz B.

Resumo

© 2016 American Chemical Society.Few-layer black phosphorus is a monatomic two-dimensional crystal with a direct band gap that has high carrier mobility for both holes and electrons. Similarly to other layered atomic crystals, like graphene or layered transition metal dichalcogenides, the transport behavior of few-layer black phosphorus is sensitive to surface impurities, adsorbates, and adatoms. Here we study the effect of Cu adatoms onto few-layer black phosphorus by characterizing few-layer black phosphorus field effect devices and by performing first-principles calculations. We find that the addition of Cu adatoms can be used to controllably n-dope few layer black phosphorus, thereby lowering the threshold voltage for n-type conduction without degrading the transport properties. We demonstrate a scalable 2D material-based complementary inverter which utilizes a boron nitride gate dielectric, a graphite gate, and a single bP crystal for both the p- and n-channels. The inverter operates at matched input and output voltages, exhibits a gain of 46, and does not require different contact metals or local electrostatic gating.

Assuntos Scopus

Complementary inverters , Field-effect devices , First-principles calculation , High carrier mobility , inverter , Layered transition metal dichalcogenides , Phosphorene , Two-dimensional crystals