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Computer Modeling of Organic Thin Film Transistors (OTFTs) using Verilog-A

A.D.D. Dwivedi, Narendra Singh Kushwah



Organic electronics has drawn considerable attention of the researchers with organic thin film transistors (OTFTs) as key components for various applications. Compared to the silicon industry where public models are well defined and commonly used to provide designers with a relative good description of any process, organic devices are still lacking for their complete device models that can fully describe their electrical characteristics. Therefore, compact model development for OTFTs is very important for development of this emerging field of OTFTs and organic electronics. In this paper we present a simple and efficient compact model for organic thin film transistor (OTFT) which can describe DC I-V characteristics of N-channel OTFT as well as P-channel OTFT. Model has been implemented in Verilog-A and simulations have been performed using Smart Spice analog circuit simulator from Silvaco Inc.

Keywords: Compact modeling, Organic Thin Film Transistors (OTFTs), Simulation Program with Integrated Circuit Emphasis (SPICE), SmartSpice, Verilog-A

Cite this Article

Narendra Singh Kushwah, Dwivedi ADD. Computer Modeling of Organic Thin Film Transistors (OTFTs) using Verilog-A. Journal of Microelectronics and Solid State Devices. 2018; 5(1): 1–7p.


Compact modeling, Organic Thin Film Transistors (OTFTs), Simulation Program with Integrated Circuit Emphasis (SPICE), SmartSpice, Verilog-A

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. Shirakawa, H.; Louis, E. J.; MacDiarmid, A. G.; Chiang, C. K.; Heeger, A. J. “Synthesis of electrically conducting organic polymers: Halogen derivatives of polyacetylene, (CH)x”, J. Chem. Soc., Chem. Commun., 16, 578–580, 1977.

. Tsumura, A.; Koezuka, H.; Ando, T. “Macromolecular electronic device: Field effect transistor with a polythiophene thin film”, Appl. Phys. Lett., 49(18), 1210–1212, 1986.

. Horowitz, G. “Organic field-effect transistors”, Adv. Mater., 10(5), 365–377, 1998.

. Lee, K. S.; Smith, T. J.; Dickey, K. C.; Yoo, J. E.; Stevenson, K. J.; Loo, Y. L. “High resolution characterization of pentacene/polyaniline interfaces in thin-film transistors”, Adv. Funct. Mater., 16(18), 2409–2414, 2006.

. Schon, J. H.; Batlogg, B. “Trapping in organic field-effect transistors”, J. Appl. Phys., 89(1), 336–341, 2001.

. Kim, Y. H.; Moon, D. G.; Han, J. I. “Organic TFT array on a paper substrate”, IEEE Electron Device Lett., 25(10), 702–704, 2004.

. Moore, S. K. “Just one word: Plastics”, IEEE Spectrum, 39(9), 55–57, 2002.

. Klauk, H.; Halik, M.; Zschieschang, U.; Eder, F.; Schmid, G.; Dehm, C. “Pentacene organic transistors and ring oscillators on glass and on flexible polymeric substrates”, Appl. Phys. Lett., 82(23), 4175–4177, 2003.

. Lee, J. B.; Subramanian,V. “Organic transistors on fiber:Afirst step toward electronic textiles”, in IEDM Tech. Dig. pp 8.3.1–8.3.4, 2003.

. Klauk, H.; Halik, M.; Zschieschang, U.; Schmid, G.; Radik, W. “High-mobility polymer gate dielectric pentacene thin film transistors”, J. Appl. Phys., 92(9), 5259–5263, 2002.

. Mizukami, M.; Hirohata, N.; Iseki, T.; Ohtawara, K.; Tada, T.; Yagyu, S.; Abe, T.; Suzuki, T.; Fujisaki, Y.; Inoue, Y.; Tokito, S.; Kurita, T. “Flexible AM OLED panel driven by bottom contact OTFTs”, IEEE Electron Device Lett., 27(4), 249–251, 2006.

. Cantatore, E.; Geuns, T. C. T.; Gelinck, G. H.; Veenendaal, E. V.; Gruijthuijsen, A. F. A.; Schrijnemakers, L.; Drews, S.; De Leeuw, D. M. “A 13.56-MHz RFID System based on organic transponders”, IEEE J. Solid-State Circuits., 42(4), 84–92, 2007.

. Brianda, D.; Opreab, A.; Courbata, J.; Barsanb, N. “Making environmental sensors on plastic foils”, Materials Today., 14(9), 416–423, 2011.

. Takamiya, M.; Sekitani, T.; Kato, Y.; Kawaguchi, H. “An organic FET SRAM with back gate to increase static noise margin and its application to braille sheet display”, IEEE J. Solid-State Circuits., 42(1), 93–100, 2007.

. Tobjork, D.; Osterbacka, R. “Paper electronics”, Adv. Mater., 23(17), 1935–1961, 2011.

. Guerin, M.; Daami, A.; Jacob, S.; Bergeret, E.; Benevent, E.; Pannier, P.; Coppard., R. “High gain fully printed organic complementary circuits on flexible plastic foils”, IEEE Trans. Electron Devices., 58(10), 3587–3593, 2011.

. Shekar, B. C.; Lee, J.; Rhee, S. “Organic thin film transistors: Materials, processes, and devices”, Korean J. Chem. Engg., 21(1), 267–285, 2004.

. Gupta, D.; Katiyar,M.; Gupta, D. “An analysis of the difference in behavior of top and bottom contact organic thin film transistors using device simulation”, Org. Electron., 10(5), 775–784, 2009.

. Cui, T.; Liang, G. “Dual gate pentacene organic field-effect transistors based on a nanoassembled SiO2 nanoparticle thin film as the gate dielectric layer”, Appl. Phys. Lett., 86(6), 064102-1–064102-3, 2005.

. Tate, J.; Rogers, J. A.; Jones, C. D. W.; Vyas, B.; Murphy, D. W.; Li, W.; Bao, Z.; Slusher, R. E.; Dodabalapur, A.; Katz, H. E. “Anodization and micro contact printing on electro less silver: Solution-based fabrication procedures for low-voltage electronic systems with organic active components”, Langmuir., 16(14), 6054–6060, 2000.

. Liu, R.; L.; Deng, F.;Yao,R.H.; Lai, P. T. “Low-operating-voltage polymer thin-film transistors based on poly (3-hexylthiophene) with hafnium oxide as the gate dielectric”, IEEE Trans. Device Mater. Reliab., 10(2), 233–237, 2010.

. Ortiz, R. P.; Facchetti, A.; Marks, T. J. “High-k organic, inorganic, and hybrid dielectrics for low-voltage organic field-effect transistors”, Chem. Rev., 110(1), 205–239, 2010.

. Krumm, J. “Printed electronics-from vision to first product”, 4th European Workshop on RFID Systems and Technologies, Freiburg, Germany June 10–11, 2008.

A.D.D. Dwivedi, Rajeev Dhar Dwivedi, Raghvendra Dhar Dwivedi, Sumit Vyas and P. Chakrabarti, "Numerical simulation of P3HT based Organic Thin Film Transistors (OTFTs)" International Journal of Microelectronics and Digital integrated circuits, Vol.1, issue-2, pp.13-20, 2015.

A. D .D. Dwivedi, "Numerical Simulation and Spice Modeling of Organic Thin Film Transistors (OTFTs)" International Journal of Advanced Applied Physics Research, Vol.1, pp.14-21, 2014.

Forrest, S.R.: The path to ubiquitous and low-cost organic electronic appliances on plastic. Nature 428, 911–918 (2004).

Anis Daami,chapter on Device Modelling for SPICE Simulations in Organic Technologies in the book Novel advances in microsystems technologies and their applications edited by Laurent A. Francis and Krzysztof Iniewski, CRC Press, 2014.

. L. W. Nagel et al., SPICE (Simulation Program with Integrated Circuit Emphasis), Memorandum No. ERL-M382, University of California, Berkeley, CA, April 1973.

. CMC, Compact Modelling Council,


. H. Shichman et al., Modeling and simulation of insulated-gate field-effect transistor switching circuits, IEEE J. Solid-State Circuits, 3(3), 285–289, September 1968.

. G. Horowitz et al., An analytical model for organic-based thin-film transistors, J. Appl. Phys., 70(1), 469–475, July 1991.

. S. M. Sze, Physics of Semiconductor Devices, 2nd edn., John Wiley & Sons, New York, 1981.

. Z. Bao et al., Soluble and processable regioregular poly(3-hexylthiophene) for thin film field-effect transistor applications with high mobility, Appl. Phys. Lett., 69(26), 4108–4110, December 1996.

. N. Satyala et al., Simulation and transient analysis of organic/inorganic CMOS inverter circuit, Proceedings of 41st Southeastern Symposium on System Theory, University of Tennessee Space Institute, Tullahoma, TN, March 15–17, 2009, T2A.5-324–T2A.5-329.

. D. Bode et al., Noise margin analysis for organic thin-film complementary technology, IEEE Trans. Electron. Dev., 7(1), 201–208, January 2010.

. H. Marien et al., A full integrated DS ADC in organic thin-film transistor technology on flexible plastic foil, IEEE J. Solid-State Circuits, 46(1), 276–284, January 2011.

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