7 October 2014 Comparison of conductor and dielectric inks in printed organic complementary transistors
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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.
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Tse Nga Ng, Tse Nga Ng, Ping Mei, Ping Mei, Gregory L. Whiting, Gregory L. Whiting, David E. Schwartz, David E. Schwartz, Biby Abraham, Biby Abraham, Yiliang Wu, Yiliang Wu, Janos Veres, Janos Veres, } "Comparison of conductor and dielectric inks in printed organic complementary transistors", 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; https://doi.org/10.1117/12.2058753
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