The valence band offset is updated automatically and should be checked for positivity by the app user. To use the app, enter the desired superlattice parameters, including the widths of the well and the barrier layer, the effective masses for electrons and holes in those layers, the band gaps in those layers, and the conduction band offset. Device engineers can use the tool to quickly compute the effective band gap for a given periodic structure and iterate the design parameters until they reach a desired band gap value. The tool uses the effective mass SchrГ¶dinger equation to estimate the electron and hole ground state energy levels in a given superlattice structure. The superlattice band gap tool helps the design of periodic structures made of two alternating semiconductor materials (superlattices). New Application: Superlattice Band Gap Tool User-Defined Impact Ionization ModelДЄ user-defined model is now available for the impact ionization feature. In addition to traps with specified species types, traps with specified neutral energy levels can now also be defined using the same general concentration profile tools available for doping and traps. More Options for Trap Density SpecificationДЇor each trap species type, in addition to the sum of trap densities, each individual contribution is now available as an option in the corresponding drop-down menu. Two new examples are included in the Semiconductor Module that help illustrate the usage of these various built-in functionalities.ДЄpplication Library path for an example modeling the SchrГ¶dinger equation: Semiconductor_Module/Verification_Examples/double_barrier_1d Other Performance Improvements Current-Driven Metal ContactsДЄ new formulation achieves easier convergence for models with current-driven metal contact boundary conditions. Appropriate boundary conditions and study types are implemented for you to set up models easily and to compute relevant quantities in various situations, such as the eigenenergies of bound states, the decay rate of quasibound states, the transmission and reflection coefficients, the resonant tunneling condition, and the effective band gap of a superlattice structure. The newly added SchrГ¶dinger Equation interface solves the single-particle SchrГ¶dinger equation for general quantum mechanical problems in 1D, 2D, and 3D, as well as for the electron and hole wave functions in quantum-confined systems under the envelope function approximation. New Physics Interface: SchrГ¶dinger Equation Review these Semiconductor Module updates in further detail below. For users of the Semiconductor Module, COMSOLВ Multiphysics В® version 5.3 brings a new SchrГ¶dinger Equation physics interface for quantum mechanical problems as well as several new models.

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