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Published on: April 21, 2016
High-Performance Black Phosphorus Field-Effect Transistors with Long-Term Air Stability
Daowei He1, Yiliu Wang, Yu Huang
1National Laboratory of Solid State Microstructures and Collaborative Innovation Center of Advanced Microstructures, School of Electronic Science and Engineering , Nanjing University , Nanjing 210093 , China.
Organic thin films protect unstable 2D materials like black phosphorus (BP) from degradation. This van der Waals passivation enhances BP field-effect transistor (FET) performance and air stability, enabling high-performance electronic devices.
Area of Science:
- Materials Science
- Nanotechnology
- Condensed Matter Physics
Background:
- Two-dimensional layered materials (2DLMs) offer unique electronic properties for advanced devices.
- Their atomically thin nature makes them highly sensitive to environmental degradation, limiting device performance and lifespan.
- Unstable 2DLMs like black phosphorus (BP) require effective passivation strategies to preserve intrinsic properties.
Purpose of the Study:
- To develop a simple, scalable, and non-disruptive passivation method for unstable 2DLMs.
- To enhance the performance and ambient stability of black phosphorus field-effect transistors (BP FETs).
- To explore the potential of van der Waals passivation using organic thin films for 2D electronic materials.
Main Methods:
- Utilized a van der Waals epitaxy approach to deposit organic thin films (dioctylbenzothienobenzothiophene, C8-BTBT) onto BP.
- Investigated the protective effect of C8-BTBT films against oxidation under ambient conditions.
- Fabricated and characterized BP FETs with C8-BTBT passivation to evaluate electronic properties and stability.
Main Results:
- C8-BTBT thin films effectively protected BP from oxidation for over 20 days in ambient conditions.
- The noncovalent van der Waals interface preserved the intrinsic electronic properties of BP.
- Achieved high-performance BP FETs with a record current density of 920 μA/μm, hole drift velocity > 1 × 10^7 cm/s, and on/off ratios up to 1 × 10^7.
Conclusions:
- A simple van der Waals passivation strategy using organic thin films can significantly improve the air stability and performance of BP FETs.
- This approach is broadly applicable to other unstable 2DLMs, offering a pathway to high-performance hybrid heterojunction devices.
- The developed passivation method addresses a key challenge in realizing stable and high-performance 2D electronics.
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