DEVSIM LLC is pleased to announce the DEVSIM mobile app. The first of its kind, it is a TCAD semiconductor device simulator available for both Android and Apple devices. Its simulation engine is the DEVSIM open source TCAD simulator.
This release provides a 1 dimensional diode example, where you can experiment with different device parameters and visualize the results. Future versions will expand to include other textbook examples.
DEVSIM 1.4.0 is now available for download. Please visit https://devsim.org for more information about the software. Documentation is available from https://devsim.net. Binary releases are available from:
https://github.com/devsim/devsim/releases
The devsim.custom_equation() and devsim.register_function() commands take Python functions, instead of the a string with the function name.
The following commands are available to store data on edges and element edges:
DEVSIM 1.3.0 is now available for download. Please visit https://devsim.org for more information about the software. Documentation is availabe from https://devsim.net. Binary releases are available from:
https://github.com/devsim/devsim/releases
All of the Tcl regression tests in the testing directory have been converted to Python 3. These tests serve as examples for features that were previously only tested using Tcl scripting.
Tcl support is deprecated and will be removed in a future release of the software.
Python 3 is now the only scripting language in the releases available from:
The Microsoft Windows version now uses Intel MKL Pardiso for direct matrix factorization. Both Linux and Apple macOS have been using Intel MKL Pardiso since November 1, 2015. Binary releases for all operating systems use BLAS/LAPACK routines from Intel Math Kernel Library.
DEVSIM releases now have better support for Python 3. Using the stable ABI, the software is able to run with newer Python 3 releases, without rebuilding the software.
Support for Python 2.7 has been removed.
The banner has been removed when the DEVSIM module is imported.
The symdiff python module is now part of the DEVSIM release. This module has additional features not available using the devsim.symdiff command from DEVSIM.
Please visit https://devsim.org for information about downloading this software and its documentation. SYMDIFF is available from https://symdiff.org.
With this version, the evaluation of the Bernoulli function and its derivative is improved. Users should expect changes in numerical results. Please visit https://devsim.org for information about downloading this software and its documentation.
The Bernoulli function,
\[and its derivative,
\[have been refactored. They are used to calculate electron and hole current densities using the Scharfetter-Gummel method.
The Bernoulli function has numerical issues when x approaches 0 and requires special evaluation. In this release, DEVSIM takes advantage of C++ math library functions for evaluating the denominator.
In addition, these functions are evaluated with extended precision, when this mode is enabled in the simulator.
Users should expect that simulation results should change in the number of solver iterations and small differences in simulation results.
December 18, 2018: DEVSIM LLC announces the release of version 1.0 of the DEVSIM® TCAD Semiconductor Device Simulator. Open source since 2013, DEVSIM® uses finite volume methods to solve for the electrical behavior of semiconductor devices on a mesh. In addition to the standard drift-diffusion equations, the density-gradient method can be used to account for quantum effects near semiconductor insulator boundaries. This approach is suitable for:
In this release, the software has been extended to support easier integration into existing Python installations on macOS, Microsoft Windows, and Linux operating systems. In addition, the version numbering system has been adapted to reflect major and minor changes to the software.
DEVSIM® is available from https://devsim.org. The site include more information for those who wish to use or participate in development of this software.
DEVSIM LLC was founded in 2008 to provide TCAD simulation software and programming services. For more information, please visit https://devsim.com.
DEVSIM® is a registered trademark of DEVSIM LLC. All product names, trademarks and registered trademarks are property of their respective owners.
DEVSIM simulation example slides are presented here:
Semiconductor Device Simulation Using DEVSIM
The source files to the DEVSIM manual are now available from:
https://github.com/devsim/devsim_documentation
The Density Gradient Method has been implemented as a simulation example for DEVSIM. This method is a quantum mechanical correction for carrier densities near a semiconductor/insulator interface.
The example scripts simulate both a 1D and 2D MOSCAP structure. The scripts generate plots to visualize the results.
It can be downloaded from https://github.com/devsim/devsim_density_gradient.
Semiconductor Device Simulation Using DEVSIM is now available from our site.
Abstract:
DEVSIM is a technology computer aided design (TCAD) simulation software. It is released under an open source license. The software solves user defined partial differential equations (PDEs) on 1D, 2D, and 3D meshes. It is implemented in C++ using custom code and a collection of open source libraries. The Python scripting interface enables users to setup and control their simulations.
In this chapter, we present an overview of the tool. This is followed with a bipolar junction transistor (BJT) design and characterization example. A collection of open source tools were used to create a simulation mesh, and visualize results
The Python scripts for simulation are here:
https://github.com/devsim/devsim_bjt_example