An Electroactive Binder in the Formulation of IGZO Ink to Print an IGZO‐Based Rectifier for Harvesting Direct Current (DC) Power from the Near Field Communication (NFC) Signal of a Smartphone

Abstract

Abstract Formulating a high‐performing semiconducting ink is crucial toward printing a diode for constructing a direct current (DC) power harvesting device, consisting of an antenna, a diode, and a capacitor, that can rectify the coupled weak near field communication (NFC) (13.56 MHz) signal (<1.5 Vpp) generated from smartphones. To achieve such performance, indium gallium zinc oxide (IGZO)‐based semiconducting ink is formulated by developing an electroactive binder, poly(4‐styrene sulfonic acid). By reducing the turn‐on voltage and providing a good rheological characteristic for printing metal insulator semiconductor‐Schottky diodes on plastic film, the newly formulated IGZO ink is able to print a rectifier that can harvest DC voltage with 50% efficiency from the coupled 13.56 MHz signal (NFC) of a smartphone.