Model Gallery

The Model Gallery features COMSOL Multiphysics model files from a wide variety of application areas including the electrical, mechanical, fluid, and chemical disciplines. You can download ready-to-use models and step-by-step instructions for building the model, and use these as a starting point for your own modeling work. Use the Quick Search to find models relevant to your area of expertise, and login or create a COMSOL Access account that is associated with a valid COMSOL license to download the model files.

Small Signal Analysis of a MOSFET

This model shows how to compute the AC characteristics of a MOSFET. Both the output conductance and the transconductance are computed as a function of the drain current.

Caughey-Thomas Mobility in a Semiconductor

With an increase in the parallel component of the applied field, carriers can gain energies above the ambient thermal energy and be able to transfer energy gained by the field to the lattice by optical phonon emission. The latter effect leads to a saturation of the carriers mobility. The Caughey Thomas mobility model adds high field velocity scattering to an existing mobility model (or to a ...

GaAs PIN Photodiode

This simple model demonstrates how to use the Semiconductor Optoelectronics interfaces to model a simple GaAs PIN diode structure. Both the stimulated and spontaneous emission in the semiconductor are accounted for. The corresponding adsorption of the light and the associated change in the complex refractive index are included in a self consistent manner.

Lombardi Surface Mobility in a Semiconductor

Surface acoustic phonons and surface roughness have an important effect on the carrier mobility, especially in the thin inversion layer under the gate in MOSFETs. The Lombardi surface mobility model adds surface scattering resulting from these effects to an existing mobility model using Matthiessen’s rule. This model demonstrates how to use the Lombardi surface mobility model for the electron ...

Surface Trapping in a Silicon Nanowire Gate-All-Around Device

A gate-all-around MOSFET consists of a nanowire with a gate electrode wrapped around the circumference. Since the entire nanowire forms the channel, this configuration provides the best possible electrostatic control of the channel and offers a good candidate for the miniaturization of MOSFETs. This model analyzes a silicon nanowire gate-all-around device, with different trap densities at the ...

Thermal Analysis of a Bipolar Transistor

This model demonstrates how to couple the Semiconductor interface to the Heat Transfer in Solids interface. A thermal analysis is performed on the existing bipolar transistor model in the case when the device is operated in the active-forward configuration. The Semiconductor interface calculates the carrier dynamics and currents within the device and outputs a heating term due to electrical ...

DC Characteristics of a MESFET

In a MESFET, the gate forms a rectifying junction that controls the opening of the channel by varying the depletion width of the junction. In this model we simulate the response of a n-doped GaAs MESFET to different drain and gate voltages. For a n-doped material the electron concentration is expected to be orders of magnitude larger than the hole concentration. Accordingly, it is possible to ...

Programming of a Floating Gate EEPROM Device

This model calculates the current and charge characteristics of a floating gate Electrically Erasable Programmable Read-Only Memory (EEPROM) device. A stationary study demonstrates the effects of varying the charge stored on the floating gate by computing Current-Voltage curves as a function of the control gate voltage for two different amounts of stored charge. Time dependent studies are then ...

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