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Spice model shapes up organic TFT panels

Posted: 25 Aug 2008 ?? ?Print Version ?Bookmark and Share

Keywords:Spice model? organic TFT? organic electronics?

Cambridge Display Technology has collaborated with Silvaco Data Systems to develop Spice model for 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 modeling approach is needed for organic TFT device properties compared to their inorganic counterparts.

Notable differences include trap-assisted charge distribution and mobility behavior, a unipolar or bipolar charge-accumulation operation mode and non-ohmic 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 behavior.

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

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

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

Cambridge Display, a spinout of Cambridge University, licenses technology related to its polymer organic LED materials and devices. It was acquired by Sumitomo Chemical Co. in 2007.

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

- Nicolas Mokhoff
EE Times

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