Fully Printed Inverters using Metal‐Oxide Semiconductor and Graphene Passives on Flexible Substrates. Issue 9 (30th June 2020)

• Record Type: Journal Article
• Authors: Singaraju, Surya Abhishek; Marques, Gabriel Cadilha; Gruber, Patric; Kruk, Robert; Hahn, Horst; Breitung, Ben; Aghassi-Hagmann, Jasmin
• Is Part Of: Physica status solidi. Volume 14:Issue 9(2020)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2020-06-30
• Subjects: flexible devices -- fully printed devices -- inverters -- metal-oxide transistors -- printed graphene -- tensile strength; Solid state physics -- Periodicals; 530.4105
• DOI: 10.1002/pssr.202000252
• Languages: English
• ISSNs: 1862-6254

Abstract

Abstract : Printed and flexible metal‐oxide transistor technology has recently demonstrated great promise due to its high performance and robust mechanical stability. Herein, fully printed inverter structures using electrolyte‐gated oxide transistors on a flexible polyimide (PI) substrate are discussed in detail. Conductive graphene ink is printed as the passive structures and interconnects. The additive printed transistors on PI substrates show an I on / I off ratio of 10 6 and show mobilities similar to the state‐of‐the‐art printed transistors on rigid substrates. Printed meander structures of graphene are used as pull‐up resistances in a transistor–resistor logic to create fully printed inverters. The printed and flexible inverters show a signal gain of 3.5 and a propagation delay of 30 ms. These printed inverters are able to withstand a tensile strain of 1.5% following more than 200 cycles of mechanical bending. The stability of the electrical direct current (DC) properties has been observed over a period of 5 weeks. These oxide transistor‐based fully printed inverters are relevant for digital printing methods which could be implemented into roll‐to‐roll processes. Abstract : Fully printed inverters on flexible substrates based on solution‐processed n‐type indium oxide semiconductor and graphene passives are demonstrated. Electrolyte gating facilitates the use of low input voltages (<1 V). The drop‐on‐demand printed inverters are suitable for digital fabrication methods and exhibit good performance characteristics in ambient. These devices show promise for usage in flexible sensors.