A bipolar junction transistor (BJT) is a type of transistor. It is a three-terminal device constructed of doped semiconductor material and may be used in amplifying or switching applications. Bipolar transistors are so named because their operation involves both electrons and holes. Although a small part of the transistor current is due to the flow of majority carriers, most of the transistor current is due to the flow of minority carriers and so BJTs are classified as 'minority-carrier' devices.

This tool allows Bipolar Junction Transistor (BJT) simulation using a 2D mesh. It allows user to simulate npn or pnp type of device in common-emitter and common-base configurations. Users can specify the Emitter, Base and Collector region depths and doping densities. Also the material and minority carrier lifetimes can be specified by the user.

If you want to know more about the physics of the operation of BJT plese refer to the following slides:

BJT tool improvements,

2.0 - It is now a full 2D simulator allowing users to plot 1D plots along the depth like conduction/valence band, electron/hole density, electric field, potential, recombination rate, current density.

1.22 - Fixed for memory issue by trimming output files.

1.12 - Update for improved quality of output curves. No overlapping of curves now.

1.11 - Discrete BJT simulator launched with output characteristics and Gummel plot.

1.1 - 1D linear BJT simulator updated for minor bugs.

1.0 - 1D linear BJT simulator launched.

PADRE (Pisces And Device REplacement) developed by Mark Pinto & Kent Smith at AT&T Bell Labs.

NCN@Purdue

If you reference this work in a publication, please cite as follows:

• Mehrotra, Saumitra Raj; Paul, Abhijeet; Klimeck, Gerhard; Vasileska, Dragica (2008), "BJT Lab," doi: 10254/nanohub-r3984.7.

  BibTex | EndNote

In addition, we would appreciate it if you would add the following acknowledgment to your publication:

• Simulation services for results presented here were provided by the Network for Computational Nanotechnology (NCN) at nanoHUB.org

1. BJT
2. nanoelectronics
3. Padre
4. semiconductor