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Spice model developed for organic TFT technology

Posted: 25 Aug 2008     Print Version  Bookmark and Share

Keywords:Spice model  organic TFT  organic electronic circuits  circuit simulation 

Cambridge Display Technology has announced that it has collaborated with Silvaco Data Systems to develop Spice model organic TFT technology. Organic TFTs form the basis of future organic electronic circuits.

The design of organic electronic circuits depends on accurate models of organic TFTs in commercial circuit simulation tools. A different modelling approach is needed for organic TFT device properties compared to their inorganic counterparts.

Notable differences include trap-assisted charge distribution and mobility behaviour, a unipolar or bipolar charge-accumulation operation mode and nonΩic contact resistances. Existing MOSFETs as well as amorphous and polysilicon TFT models are not suitable for the design of organic TFT circuits.

The rapid development of organic electronics has been driven by applications requiring low-cost electronic circuits covering large areas with mechanical flexibility. These applications include e-paper, smart fabrics, flexible displays, printed electronics and RFIDs.

Spice models are used to check the integrity of circuit designs and to predict circuit behaviour.

The new model is implemented in Simucad's SmartSpice tool. The Spice model combines universal charge-based FET modelling with organic TFT-specific channel charge, mobility bias, temperature dependences and non-linear contact resistances. The combination is said to maximise generic modelling capabilities, making it suitable for a variety of device architectures, material specifications and fabrication technologies, according to Simucad.

Simucad is a spinoff from Silvaco International,and provides simulation and CAD software tools for analogue, mixed-signal and RF chip development. Simucad provides a tool to check the integrity of circuit designs and predict circuit behaviour.

The project "will speed development and commercialisation of low-cost, rigid and flexible electronics applications of organic semiconductor technology," David Fyfe, CEO of Cambridge Display, said in a statement.

The project was partly funded by the U.K Technology Strategy Board.

- Nicolas Mokhoff
EE Times

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