SEQUAL 2.1 is a device simulation program that computes Semiconductor Electrostatics by Quantum Analysis. Given a device, SEQUAL will compute the electron density and the current density using a quantum mechanical, collisionless description of electron propagation. It was designed to be a post-processor for classical simulation programs; as such, it does not calculate any material parameters. Instead, SEQUAL relies upon the output from classical analysis programs such as FISH1D or PUPHS to provide the description of a device. When a self-consistent solution is desired, SEQUAL allows for iteration between calculations of the electron density and the electrostatic potential. The program was designed for analyzing propagating states, but a bound state analysis has also been added. SEQUAL is based on the formulation of M. Cahay, M. McLennan, S. Datta, and M. S. Lundstrom, "Importance of Space-Charge Effects in Resonant Tunneling Devices," Applied Physics Letters, vol. 50 (10), pp. 612-614, 1987. The implementation and operation are described in the SEQUAL User's Manual.
The code for SEQUAL version 2.1 (Dec 1, 1990) is included in the Resonant Tunneling Diode Simulator, and available as open source. This page is no longer needed, and may go away soon.
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