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Proceedings Paper

Comparison of conductor and dielectric inks in printed organic complementary transistors
Author(s): Tse Nga Ng; Ping Mei; Gregory L. Whiting; David E. Schwartz; Biby Abraham; Yiliang Wu; Janos Veres
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Paper Abstract

Two types of printable conductor and a bilayer gate dielectric are evaluated for use in all-additive, inkjetprinted complementary OTFTs. The Ag nanoparticle ink based on nonpolar alkyl amine surfactant or stabilizer enables good charge injection into p-channel devices, but this ink also leaves residual stabilizer that modifies the transistor backchannel and shifts the turn-on voltage to negative values. The Ag ink based on polar solvent requires dopant modification to improve charge injection to p-channel devices, but this ink allows the OTFT turn-on voltage to be close to 0 V. The reverse trend is observed for n-channel OTFTs. For gate insulator, a bilayer dielectric is demonstrated that combines the advantages of two types of insulator materials, in which a fluoropolymer reduces dipolar disorder at the semiconductor-dielectric interface, while a high-k PVDF terpolymer dielectric facilitates high gate capacitance. The dielectric is incorporated into an inverter and a three-stage ring oscillator, and the resulting circuits were demonstrated to operate at a supply voltage as low as 2 V, with bias stress levels comparable to circuits with other types of dielectrics.

Paper Details

Date Published: 7 October 2014
PDF: 6 pages
Proc. SPIE 9185, Organic Field-Effect Transistors XIII; and Organic Semiconductors in Sensors and Bioelectronics VII, 91850X (7 October 2014); doi: 10.1117/12.2058753
Show Author Affiliations
Tse Nga Ng, Palo Alto Research Ctr., Inc. (United States)
Ping Mei, Palo Alto Research Ctr., Inc. (United States)
Gregory L. Whiting, Palo Alto Research Ctr., Inc. (United States)
David E. Schwartz, Palo Alto Research Ctr., Inc. (United States)
Biby Abraham, Xerox Research Ctr. of Canada (Canada)
Yiliang Wu, Xerox Research Ctr. of Canada (Canada)
Janos Veres, Palo Alto Research Ctr., Inc. (United States)


Published in SPIE Proceedings Vol. 9185:
Organic Field-Effect Transistors XIII; and Organic Semiconductors in Sensors and Bioelectronics VII
Zhenan Bao; Ruth Shinar; Ioannis Kymissis; Iain McCulloch, Editor(s)

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