Towards printed magnetic sensors based on organic diodes

TL;DR

This study investigates organic diode-based magnetic sensors, demonstrating room-temperature magnetoresistance effects up to 16%, with device fabrication via spin coating and inkjet printing, highlighting potential for scalable magnetic sensing applications.

Contribution

First demonstration of magnetoresistance in organic diodes fabricated by spin coating and inkjet printing at room temperature, with analysis of MR behavior and device optimization prospects.

Findings

Magnetoresistance up to 16% in spin-coated devices

Magnetoresistance up to 10% in inkjet printed devices

MR response depends on measuring current and device fabrication method

Abstract

We report the study of magnetotransport properties of regio-regular poly (3-hexyl thiophene) based organic diodes. The devices were fabricated using two different techniques of spin coating and inkjet printing. Positive magnetoresistance (MR) effect was observed at room temperature in all the devices. The highest MR magnitude reached up to 16% for some spin-coated devices and up to 10% in inkjet printed devices. The MR magnitude and line shapes were found to depend strongly on the measuring current. We observed deviation from the theoretically predicted Lorentzian or non-Lorentzian line shape of the MR traces, which is discussed in detail in the article. Although, the printed devices exhibit MR response as high as for the spin coated ones, they still need to be optimized in terms of performance and yield for large scale applications as magnetic sensors.