**Author details**

memory and clock generator were fabricated employing amorphous-IGZO FETs and were functioning at 1 V. Such systems, does not need any external driving element, and, thus, no further interconnection is necessary. In a similar direction, Myny et al. presented a flexible NFC barcode tag, with direct clock division circuit, which is compliant with ISO14443-A [44]. To further extend the spectrum of possibilities of printed, interconnectionless electronics, the group led by Prof. Jan Genoe, for instance, has demonstrated the feasibility of flexible control, driver and conversion electronics for photovoltaics-powered micro LCD screens, suggestively integrated onto a contact lens [45]. In this article they demonstrate the great potential of oxidebased electronics, fabricating a system which would have needed a high number of interconnects, and it would have not been realizable without this enabling technology. Finally, although flexible sensors have been often presented in many works, their biggest limitation was the necessity to connect them to external amplifiers and read-out electronics. Recent efforts in literature have shown how stable and reliable amplifier can be obtained employing a-IGZO FETs [46], although they still present the classic limitation of unimodal pseudo-CMOS

**Figure 14.** (a) Cross-section of the CMOS amplifier, with the different layers emphasized in different colors (b) photograph of a flexible substrate with many devices (c) voltage gain as a function of bias voltages, measured in ambient air (d) bode plot for different bias voltages, showing how the gain can be gate tuned. Figure adapted from [47] with authorization.

**Figure 13.** (a) A complete tag with RFID chip, antenna and flexible battery for a complete sensing kit (b) realization of an anti-intrusion system with sensing elements integrated in the sealing tape (c) photo of chip connected to printed line

with an ACA. Figure adapted from [41] with authorization.

106 Flexible Electronics

Almudena Rivadeneyra<sup>1</sup> \*, Florin C. Loghin1 and Aniello Falco<sup>2</sup>

\*Address all correspondence to: almudena.rivadeneyra@tum.de

1 Institute for Nanoelectronics, Technical University of Munich, Munich Germany

2 Faculty of Science and Technology, Free University of Bolzen-Bolzano, Bolzen Italy
