Organic material deposition by gravure printing is a promising pathway for the realization of large area flexible electronic devices. Nevertheless, in order to achieve high performance it is required to improve the electronic ink printability, operating on the fluid dynamic mechanisms involved during the process. In this work, this issue has been faced working on ink characteristics for a conductive and a dielectric material. The suitable ink features have been defined studying the influence on the printability of the different forces that act in the fluid during the printing process, using an experimental approach. Properly defined ink formulations have been printed, considering different shapes and dimensions of the cells on the gravure cliché to fit the ink features. The printing outcomes have been compared and analysed through the evaluation of several significant fluid dynamic parameters and the rheological characterization of the materials. Finally, exploiting the results of this study, high performance fully printed organic thin film transistors have been realized.

通过凹版印刷的有机材料沉积是实现大面积柔性电子设备的有希望的途径。然而，为了获得高性能，需要在处理过程中涉及的流体动力学机构上进行操作以改善电子墨水的可印刷性。在这项工作中，一直在研究导电和介电材料的油墨特性问题。已经定义了合适的油墨特征，使用实验方法研究了在印刷过程中作用在流体中的不同力对可印刷性的影响。考虑到凹版印刷版上单元的不同形状和尺寸以适合油墨功能，已经印刷了正确定义的油墨配方。通过评估几个重要的流体动力学参数和材料的流变特性，对印刷结果进行了比较和分析。最后，利用这项研究的结果，已经实现了高性能的全印刷有机薄膜晶体管。