Percorrer por autor "Villani, Fulvia"
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- All-inkjet-printed thin-film transistors: manufacturing process reliability by root cause analysisPublication . Sowade, Enrico; Ramon, Eloi; Mitra, Kalyan Yoti; Martinez-Domingo, Carme; Pedro, Marta; Pallares, Jofre; Loffredo, Fausta; Villani, Fulvia; Gomes, Henrique L.; Teres, Lluis; Baumann, Reinhard R.We report on the detailed electrical investigation of all-inkjet-printed thin-film transistor (TFT) arrays focusing on TFT failures and their origins. The TFT arrays were manufactured on flexible polymer substrates in ambient condition without the need for cleanroom environment or inert atmosphere and at a maximum temperature of 150 degrees C. Alternative manufacturing processes for electronic devices such as inkjet printing suffer from lower accuracy compared to traditional microelectronic manufacturing methods. Furthermore, usually printing methods do not allow the manufacturing of electronic devices with high yield (high number of functional devices). In general, the manufacturing yield is much lower compared to the established conventional manufacturing methods based on lithography. Thus, the focus of this contribution is set on a comprehensive analysis of defective TFTs printed by inkjet technology. Based on root cause analysis, we present the defects by developing failure categories and discuss the reasons for the defects. This procedure identifies failure origins and allows the optimization of the manufacturing resulting finally to a yield improvement.
- Up-scaling of the manufacturing of all-inkjet-printed organic thin-film transistors: device performance and manufacturing yield of transistor arraysPublication . Sowade, Enrico; Mitra, Kalyan Yoti; Ramon, Eloi; Martinez-Domingo, Carme; Villani, Fulvia; Loffredo, Fausta; Gomes, Henrique L.; Baumann, Reinhard R.All-inkjet-printed thin-film transistors (TFTs) have been demonstrated in literature using mainly laboratory inkjet equipment, simple one-channel layout and only a low number of manufactured TFT devices. We report on the development and the up-scaling of the manufacturing of all-inkjet-printed TFT arrays using industrial inkjet equipment. The manufacturing of the TFTs was carried out in ambient condition without the need for cleanroom environments or inert atmospheres and at a maximum temperature of 150 degrees C enabling the use of flexible polymer films as substrate. Arrays of 924 TFTs were manufactured on an area of about DIN A4 (297 x 420 mm(2)). This allows the consideration of statistics, e.g. to determine the process yield as a function of device design and layout. We present process yields for all-inkjet-printed TTFs up to 82% demonstrating the potential of the developed all-inkjet-printing process. (C) 2015 Elsevier B.V. All rights reserved.