Every software package contains a full set of examples suitable for that version and are installed with the software. If you see examples here that are not in your installation you should consider updating to a later version of the software. These examples can be used by beginners and advanced users for product evaluation, teaching purposes, and self-training.
Required Modules
Victory Device
- 2D Simulator
- 2D Optical
- 2D Organic
This example demonstrates the use of singlet exciton dissociation in the modelling of organic/polymer solar cell devices. This model may also be used to model organic/polymer imaging sensors.
The modelling of organic solar cells through exciton dissociation is based on the bulk heterojunction (BHJ) concept. In this model we do not consider the details of the location of the heterointerface as it is considered as a random interpenetrating mixture of materials.
Instead we assume the material is electrically uniform and that the mean distance from anywhere to the heterointerface is characterized in the dissociation model by the A.SINGLET parameter of the MATERIAL statement.
There are three keys for simulation of exciton dissociation. They are the inclusion of the singlet exciton continuity equation, the inclusion of Langevin recombination and the inclusion of the singlet dissociation model. These three models are enabled on the MODEL statement by the parameters SINGLET , LANGEVIN and S.DISSOC .
Another consideration unique to organic photodetection is characterized by the QE.EXCITON parameter of the MATERIAL statement. This parameter characterizes the number of singlet excitons generated for each photon that is absorbed. Absorbed photons not generating singlets generate electron-hole pairs.
Finally, you should notice that the photogeneration rate is specified in the C-interpreter function. This was done as a simple means to introduce a uniform photogeneration rate in the material. This is sometimes necessary if for example we do not know the details of the extinction coefficient versus wavelength for the materials involved.
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