A model based on a linearized solution of the Shockley-Read-Hall trapping expressions is presented. It allows these equations to be eliminated from the system matrix. This results in significantly reduced memory requirements and execution times. To illustrate the approach, the switch-on and switch-off transients of a thin-film transistor were simulated. These results are compared with ones obtained from the full two-dimensional transient numerical model. It is shown that the linearized model can simulate a wide variety of device behavior, providing close agreement with the full model at a fraction of the cost.>

A description is given of CHORD, a semiconductor device simulation development tool created at the University of Waterloo. CHORD is written as several small independent programs which use a centralized database facility and is specifically designed to allow the simple creation, development, and testing of new simulation models and algorithms. Communication between programs is implemented by using a byte-stream process. This allows transfer of information between individual programs running on different machines. CHORD is a general environment in that its models can incorporate any set of user-defined variables of equations. This is illustrated by the development of contact boundary conditions incorporating external circuit elements and circuit-level device models using the modified nodal formulation. Several examples of both steady-state and transient simulations are presented.>