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Vertical curves provide the transition between two roadway grades, ensuring safety, comfort, and functionality. Calculating elevations at specific stations along the curve involves several systematic steps based on the curve's geometry and provided design parameters.The vertical curve is defined by its length, grades, Point of Vertical Intersection (P.V.I.) location, and P.V.I. elevation. The stations of the Point of Vertical Curvature (P.V.C.), where the curve begins, and the Point of Vertical...
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Vertical curves are parabolic transitions that connect different grades on highways and railroads, ensuring a smooth alignment between back and forward tangents. The back tangent represents the initial grade, while the forward tangent defines the subsequent grade. These curves can be symmetrical, with equal tangent lengths, or nonsymmetrical, with varying lengths. The key points defining a vertical curve include the Point of Vertical Intersection (P.V.I.), where the tangents meet; the Point of...
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Vertical curves are essential in roadway design because they provide smooth transitions between varying roadway grades. Designing vertical curves involves calculating intermediate elevations and identifying the curve's highest or lowest point, which is essential for optimal roadway performance.Intermediate elevations on a vertical curve are determined using the tangent offset method. This method considers the initial elevation at the start of the curve, the grades, and the curve's geometry. The...
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Sight distance on vertical curves is critical in roadway design. It ensures drivers can see far enough ahead to identify and respond to hazards effectively. This directly impacts safety, driver comfort, and the overall efficiency of the transportation network.Vertical curves are classified into crest and sag curves based on their geometry. For crest curves, sight distance is determined by the line of sight between a driver's eye and a small object on the road's surface. Design parameters for...
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Updated: Jan 25, 2026

Preparation of Silicon Nanowire Field-effect Transistor for Chemical and Biosensing Applications
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Vertical Tunnel Field-Effect Transistor with Polysilicon Layer.

Won Joo Lee1, Hui Tae Kwon1, Hyun-Seok Choi1

  • 1Department of Nanoenergy Engineering, BK21 Plus Nanoconvergence Technology Division, Pusan National University, Busan, 46241, Korea.

Journal of Nanoscience and Nanotechnology
|April 28, 2019
PubMed
Summary
This summary is machine-generated.

A new tunnel field-effect transistor (TFET) design with an intrinsic polysilicon layer significantly boosts on-current and lowers subthreshold swing, overcoming limitations of conventional TFETs.

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Area of Science:

  • Semiconductor device physics
  • Advanced transistor technology

Background:

  • Conventional tunnel field-effect transistors (TFETs) suffer from low ON-current, limiting their performance.
  • Improving TFET performance is crucial for next-generation electronics.

Purpose of the Study:

  • To propose and validate a novel TFET structure with enhanced performance.
  • To investigate the impact of device parameters on the proposed TFET.

Main Methods:

  • Technology computer-aided design (TCAD) simulations were employed.
  • A novel TFET structure featuring an intrinsic polysilicon layer was designed.

Main Results:

  • The proposed TFET exhibits over 50% higher ON-current (0.13 μA/μm) compared to conventional planar TFETs.
  • The device achieves a lower subthreshold swing (SS) of 53 mV/dec.
  • The influence of various device parameters on performance was analyzed.

Conclusions:

  • The novel TFET structure effectively increases the tunneling area, enhancing ON-current.
  • The proposed device demonstrates superior performance metrics, making it promising for future applications.