Black phosphorus field-effect transistors¶
Why this mattered¶
Black phosphorus field-effect transistors mattered because they showed that the post-graphene search for two-dimensional electronics did not have to choose between graphene’s high mobility and transition-metal dichalcogenides’ usable bandgaps. Li and colleagues demonstrated few-layer black phosphorus devices operating at room temperature, including sub-7.5 nm channels with current modulation around (10^5), clear current saturation, and field-effect mobility reported near 205 cm² V⁻¹ s⁻¹ for 5 nm samples. That combination made black phosphorus one of the first compelling examples of a thin, layered semiconductor that could plausibly support logic-device behavior rather than only high-conductance transport.
The paradigm shift was not simply that another 2D material had been exfoliated, but that black phosphorus introduced a qualitatively different design space: an elemental, layered semiconductor with a thickness-dependent direct bandgap, relatively high carrier mobility, and strong in-plane anisotropy. After this paper, “phosphorene” became a serious platform for nanoelectronics and optoelectronics, motivating work on ambipolar transport, photodetectors, p-n junctions, van der Waals heterostructures, strain-tunable devices, and encapsulation strategies to manage environmental instability. Its later impact was therefore twofold: it expanded the catalog of viable 2D semiconductors beyond graphene and MoS₂-like compounds, and it sharpened the central materials lesson of the field: useful 2D electronics would depend on balancing bandgap, mobility, contacts, stability, and thickness control, not on any single headline property.
Abstract¶
(no abstract available)
Related¶
- cite → Projector augmented-wave method — The black phosphorus transistor study uses the projector augmented-wave method for first-principles calculations of phosphorene electronic structure.
- cite → Single-layer MoS2 transistors — Black phosphorus FETs are positioned against single-layer MoS2 transistors as another atomically thin semiconductor channel for field-effect electronics.
- cite → Electric Field Effect in Atomically Thin Carbon Films — Black phosphorus FETs cite graphene's electric-field effect as the foundational demonstration of gate-tunable transport in atomically thin materials.
- cite → Hybrid functionals based on a screened Coulomb potential — Black phosphorus FETs use screened hybrid-functional calculations to estimate black phosphorus electronic band structure and band gaps.
- enables ← Projector augmented-wave method — The projector augmented-wave method enabled first-principles electronic-structure calculations used to characterize black phosphorus materials.
- enables ← Electric Field Effect in Atomically Thin Carbon Films — Graphene field-effect devices demonstrated atomically thin materials as transistor channels, enabling analogous black phosphorus field-effect transistors.
- enables ← Hybrid functionals based on a screened Coulomb potential — The screened hybrid HSE functional enabled more accurate band-gap calculations for black phosphorus electronic properties.