[17p-302-1~14] 12.4 Organic light-emitting devices and organic transistors

△ [17p-302-4] Printed Organic Inverter Circuits with Ultra-Low Operating Voltages

〇Rei Shiwaku¹, Hiroyuki Matsui¹, Kazuma Hayasaka¹, Yasunori Takeda^1,2, Takashi Fukuda³, Daisuke Kumaki¹, Shizuo Tokito¹ (1.Research Center for Organic Electronics, Yamagata Univ., 2.JSPS Research Fellow DC, 3.Tosoh Corporation)

Keywords:Organic Electronics, Printed Electronics, Low-Voltage Operation

Low-voltage circuit operation is one of the primary requirements for the practical use of printed electronic devices employing organic thin-film transistors (OTFTs), in particular, the driving of devices with power supplied by energy harvesting using organic solar cells or biofuel cells, which require low-voltage operation, typically below 1 V. Here we report on printed organic inverter circuits that operate at 0.3 V with negligible hysteresis, a gain of greater than 10, and rail-to-rail input and output operation, by utilizing a blend of 2,7-dihexyl-dithieno[2,3-d:2’,3’-d’]benzo[1,2-b:4,5-b’]dithiophene (DTBDT-C₆) and polystyrene (PS). The ultra-low voltage operation of these circuits can be attributed to its finely tunable turn-on voltage, low trap density, ohmic contacts, and minimal channel length modulation coefficients. Moreover, these organic inverter circuit arrays exhibited high uniformity with an average switching voltage of 0.32 ± 0.03 V. As a result, printed organic devices with ultra-low operating voltages could be realized with exceptional reproducibility, helping to further the potential of printed electronic applications based on ultra-low power organic devices in the future Internet of Things (IoT) ecosystem.