SPICE Optimization of Organic FET Models Using Charge Transport Elements

Abstract

We report on a modeling technique that uses charge transport equations to calculate channel current in organic field effect transistors (OFETs) by numerical solution in the SPICE simulation program. SPICE is also used to optimize the model and achieve a fit to measured characteristics within 5% error. The overall modeling technique is a bridge between physical models of charge transport and a SPICE model useful in circuit simulation without requiring a closed-form drain-current equation. The automatic optimization of the simulation to measured curves will also allow, in the future, the empirical weighing of various charge transport effects in search of physical device operation, given sufficient empirical data. This modeling technique was applied to the measured characteristics of an OFET using pentacene in which the mobility was dependent on the voltage in the channel. The accuracy of the fit was better than 5% for 40 V > V DS > 7 V and better than 20% for V DS < 7 V. Simulation was completed within 3 min for this optimization on a modern personal computer.

Air‐Operable, High‐Mobility Organic Transistors with Semifluorinated Side Chains and Unsubstituted Naphthalenetetracarboxylic Diimide Cores: High Mobility and Environmental and Bias Stress Stability from the Perfluorooctylpropyl Side Chain

“…This is helpful for circuit design. [ 52 ] The small difference in initial performance between N 2 and air atmospheres shows that the 8-3-side chain kinetically protects against oxygen and moisture, especially the large oxygen-induced positive shift of V T . [ 21 , 48 ] Many other n-channel OTFTs are unstable in air or have large V T .…”

Design and Simulation of a 6-Bit Successive-Approximation ADC Using Modeled Organic Thin-Film Transistors

“…Among those values, the , , and diel are the physical structure parameters; 0 , th , , aa , and sat are extracted from the experimental data [10,15,16]. The others are fitting parameters determined by simulating with numerical different values.…”

“…Its unique advantages over Si-based counterpart include flexibility, biocompatibility, and low-cost process [4][5][6]. In particular in research and development of organic IC, time and cost could be reduced significantly with computeraided design (CAD) tools [7][8][9][10]. Among CAD tools, HSPICE and Cadence Virtuoso are famous for their high accuracy, multifunction, and ease to use.…”

LED switching module with organic devices

“…Analytic models of OTFTs, as well as finite element models, have already been realized, as presented in [8][9][10]. In this paper, the model proposed is basic, which leads to increased flexibility.…”