title: Environmentally friendly transistors and circuits on paper.
abstract: We created environmentally friendly low-voltage, ion-modulated transistors (IMTs) that can be fabricated successfully on a paper substrate. A range of ionic liquids (ILs) based on choline chloride (ChoCl) were used as the electrolytic layer in the IMTs. Different organic compounds were mixed with ChoCl to create solution-processable deep eutectic mixtures that are liquid or semiliquid at room temperature. In the final, solid version of the IMT, the ILs are also solidified by using a commercial binder to create printable transistor structures The semiconductor layer in the IMT is also substituted with a blend of the original semiconductor and a biodegradable polymer insulator. This reduces the amount of expensive and potentially harmful semiconductor used, and it also provides increased transistor performance, especially increasing the device switching speed. These environmentally friendly IMTs are then used to create ring oscillators, logic gates, and memories on paper.
authors.affiliation: Department of Natural Sciences/Physics and Center for Functional Materials, Åbo Akademi University, Porthaninkatu 3, 20500 Turku (Finland). fredrik.pettersson@abo.fi.
authors.forename: Fredrik
authors.initials: F
authors.lastname: Pettersson
authors.forename: Tommi
authors.initials: T
authors.lastname: Remonen
authors.forename: David
authors.initials: D
authors.lastname: Adekanye
authors.forename: Yanxi
authors.initials: Y
authors.lastname: Zhang
authors.forename: Carl-Eric
authors.initials: CE
authors.lastname: Wilén
authors.forename: Ronald
authors.initials: R
authors.lastname: Österbacka
keywords: ion-modulated transistors; ionic liquids; logic circuits; paper electronics; sustainable chemistry