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Up-scaling of the manufacturing of all-inkjet-printed organic thin-film transistors: Device performance and manufacturing yield of transistor arrays

: Sowade, E.; Mitra, K.Y.; Ramon, E.; Martinez-Domingo, C.; Villani, F.; Loffredo, F.; Gomes, H.L.; Baumann, R.R.


Organic Electronics 30 (2016), S.237-246
ISSN: 1566-1199
European Commission EC
FP7-ICT; 287682; TDK4PE
Technology & Design Kits for Printed-Electronics
Fraunhofer ENAS ()

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.