Characterization and Analysis of Organic Devices and Circuits P13 (Subprojekt des NFN S-97)
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The goal of the present proposal is to characterize and analyse organic devices in respect to circuit simulation and design. During device development and optimisation, which is done in other sub-projects [Pr10-12] of this proposal, it is extremely valuable and necessary to receive feedback from circuit simulation and design to influence the optimisation strategy of the device itself. This procedure is well known from e.g. bulk-Si and SiGe device technology development, where a close link in the simultaneous work between device development and circuit design is state of the art in technology development. It is this feedback loop between the device and the circuit which allows to specify e.g. which supply/node voltages are possible and useful as well as which threshold voltages should be used with regard to later circuit designs.
The work in this sub-project is divided in three main tasks. In the first task the decision of the model strategy between pure analytical, table based and pure empirical models or combinations of those models has to be made. This decision strongly depends on the portion of the actual physical understanding of those devices and of the usability of this knowledge for device modelling for use in circuit simulation. Another important question is, whether or not a single equivalent circuit could be used for devices with different active layers.
In the second task the modelling itself has to be done, which also requires research work in test structures and measurement methods. This is necessary e.g. to account for the not structured active layers in actual organic device. Up to now no suitable model for organic devices like transistors exists. The third part of the project deals with circuit design to demonstrate the potential of the organic devices for use in different circuits. It also deals with the integration of the model(s) in one of the currently used state of the art circuit simulators.