Generally why we are performing the simulation and what kind of information can be obtained and what is the unknown information that simulation can give an insight
I guess you determine the unknown information that you want to study.
In order to answer this question, one has to return to the definition of simulation. Simulation is to get the performance of the the objects based on theoretical models developed for these objects using computers or any other computation tool.
So to simulate an object which may be a system, a subsystem or a component or element, one has to perform the following steps:
- Develop a physical model for the object,
- Develop a mathematical model of the object, which is the basic equations describing the behavior of the of the component of the model and their interrelationship.
- Then solve this sytem of equations under certain initial and boundary conditions.
- The aim of the solution is to compute the intended performance metricates of the object and their dependence on the performance parameters of the object.
The other way was to conduct laboratory experiments to get the performance metrics and their dependence on the performance parameters. This will be costly and tedious.
But the problem i that the simulation results may not agree well with the simulation results. So, efforts are spent to elaborate the simulation such that gets close to reality.
Applying this on organic devices an organic diode:
- At first one has to describe the diode physically by giving its layer structure and dimensions
- One develops the system of equations describing the electrical behavior of the diode based on the basic semiconductor transport equations, like the poisson equation , the current and continuity equations. These equations describe the charge transport in an infinitesimal volume of a semiconductor, therefore they are differential equations. To be solved they need initial and boundary conditions which are determined by the applied voltage on the device or the incident light. The transport equations has material parameters such as the mobility, the lifetime and diffusion coefficient.
- The system of equations can be solved analytically or numerically to get for example the I-V characteristic of the diode.
- Then the I-V can be displayed graphically or given in a table
-One can study the effect of the phyical and technological parameters on the I-V and choose the optimum ones or the one which mach the required characteristics better.
All this can be done prior making any experiment.
Such simulators are becoming strong such they are termed virtual factory!
Best wishes
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