This section describes how to create a new alloy material model in the material database. For details on the Semiconductor material input parameters, see the Semiconductor material model page. For details about the bowing parameters, see the Alloys material model page.
While the Electrical/thermal material database contains models for many common alloys, it may be necessary to add new alloy models for different systems. This section will describe how to set the minimum parameters necessary for a new alloy model. A new alloy can be added to the material database by opening the material database and choosing the "Binary Alloy" option from the "new material" button menu. The newly defined alloy can be named and a color can be chosen to represent the material in the layout.
Once a new alloy material is created, the base materials can be selected using the pull down menus. Any two semiconductor materials from the material database can be selected to create a binary alloy. The first semiconductor assumes mole fraction (1-x) and the second one, x. Once the base materials are selected, the proper interpolation option needs to be defined. To learn about the two interpolation options, see the Alloys material model page.
The steps involved in creating a ternary alloy is similar to that of a binary alloy. However, there is one key difference. The base semiconductors for a ternary alloy are compound semiconductors. The default material database in CHARGE/HEAT contains models for many common compound semiconductors used in ternary alloys. These can be directly used as base materials to create ternary alloys. For example, the GaAs and InAs material models can be used as base materials to create InGaAs. The alloy mole fraction will be (InAs)x(GaAs)1-x, or InxGa1-xAs.