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A Compact SPICE Model for Organic TFTs and Applications to Logic Circuit Design

Accepted version
Peer-reviewed

Type

Article

Change log

Authors

Valletta, A 
Demirkol, AS 
Maira, G 
Frasca, M 
Vinciguerra, V 

Abstract

This work introduces a compact DC model developed for organic thin film transistors (OTFTs) and its SPICE implementation. The model relies on a modified version of the gradual channel approximation that takes into account the contact effects, occurring at nonohmic metal/organic semiconductor junctions, modeling them as reverse biased Schottky diodes. The model also comprises channel length modulation and scalability of drain current with respect to channel length. To show the suitability of the model, we used it to design an inverter and a ring oscillator circuit. Furthermore, an experimental validation of the OTFTs has been done at the level of the single device as well as with a discrete-component setup based on two OTFTs connected into an inverter configuration. The experimental tests were based on OTFTs that use small molecules in binder matrix as an active layer. The experimental data on the fabricated devices have been found in good agreement with SPICE simulation results, paving the way to the use of the model and the device for the design of OTFT-based integrated circuits.

Description

Keywords

flexible electronics, organic thin film transistors, SPICE modeling

Journal Title

IEEE Transactions on Nanotechnology

Conference Name

Journal ISSN

1536-125X
1941-0085

Volume Title

15

Publisher

IEEE
Sponsorship
Engineering and Physical Sciences Research Council (EP/K03099X/1)
This work was supported in part by the MIUR by means of the national Program PON R&C 2007-2013 and in part by project “Elettronica su Plastica per Sistemi Smart disposable” PON02 00355 3416798.