Cambridge Graphene Centre, University of Cambridge, 9 JJ Thomson Avenue, Cambridge, CB3 0FA, UK.
Department of Materials Science and Metallurgy, University of Cambridge, 27 Charles Babbage road, Cambridge, CB3 0FS, UK.
Nat Commun. 2017 Oct 31;8(1):1202. doi: 10.1038/s41467-017-01210-2.
Fully printed wearable electronics based on two-dimensional (2D) material heterojunction structures also known as heterostructures, such as field-effect transistors, require robust and reproducible printed multi-layer stacks consisting of active channel, dielectric and conductive contact layers. Solution processing of graphite and other layered materials provides low-cost inks enabling printed electronic devices, for example by inkjet printing. However, the limited quality of the 2D-material inks, the complexity of the layered arrangement, and the lack of a dielectric 2D-material ink able to operate at room temperature, under strain and after several washing cycles has impeded the fabrication of electronic devices on textile with fully printed 2D heterostructures. Here we demonstrate fully inkjet-printed 2D-material active heterostructures with graphene and hexagonal-boron nitride (h-BN) inks, and use them to fabricate all inkjet-printed flexible and washable field-effect transistors on textile, reaching a field-effect mobility of ~91 cm V s, at low voltage (<5 V). This enables fully inkjet-printed electronic circuits, such as reprogrammable volatile memory cells, complementary inverters and OR logic gates.
基于二维（2D）材料异质结结构（也称为异质结构）的全印刷可穿戴电子产品，例如场效应晶体管，需要由活性通道、介电层和导电接触层组成的稳健且可重复的印刷多层堆叠。石墨和其他层状材料的溶液处理提供了低成本的油墨，从而能够制造印刷电子产品，例如通过喷墨印刷。然而，二维材料油墨的质量有限、层状排列的复杂性以及缺乏能够在室温下、应变下和经过几次洗涤循环后工作的介电二维材料油墨，阻碍了具有全印刷二维异质结构的纺织品上电子器件的制造。在这里，我们展示了使用石墨烯和六方氮化硼（h-BN）油墨完全喷墨打印的 2D 材料活性异质结构，并使用它们在纺织品上制造了所有喷墨打印的柔性和可清洗场效应晶体管，达到了约 91 cm V s 的场效应迁移率，在低电压（<5 V）下。这使得全喷墨打印的电子电路成为可能，例如可重编程的易失性存储单元、互补反相器和 OR 逻辑门。
