Dresden 2026 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 49: Magnetic Imaging, Information Technology, and Sensors
MA 49.9: Vortrag
Donnerstag, 12. März 2026, 17:00–17:15, POT/0112
Sensing Electric Currents in an a-IGZO TFT-Based Circuit Using a Quantum Diamond Microscope — •Pralekh Dubey1, Mayana Yousuf Ali Khan2, Lakshmi Madhuri P3, Ashutosh Kumar Tripathi3, Phani Kumar Peddibhotla1, and Pydi Ganga Bahubalindruni2 — 1Department of Physics, Indian Institute of Science Education and Research, Bhopal — 2Department of Electrical Engineering and Computer Science, Indian Institute of Science Education and Research, Bhopal — 3National Centre for Flexible Electronics, Indian Institute of Technology, Kanpur
Quantum diamond microscopy (QDM), based on nitrogen-vacancy centers in diamond, provides a new approach for non-invasive magnetic imaging and diagnostics of electronic circuits under ambient conditions. By detecting magnetic fields generated by on-chip currents, QDM can probe device regions inaccessible to conventional electrical methods. It enables reconstruction of current density maps with sub-micron spatial resolution and sensitivity down to sub-microampere currents. Here, we employ a home-built QDM to map current flow in amorphous indium-gallium-zinc oxide (a-IGZO) thin-film transistor (TFT) circuits, a key technology for flexible and transparent electronics. As a demonstration, we map magnetic fields produced by current flowing through an a-IGZO TFT-based current mirror circuit. The corresponding current density was reconstructed, enabling direct visualization of current pathways. This study establishes QDM as a novel and powerful diagnostic tool for evaluating oxide-semiconductor circuits and emerging technologies.
Keywords: Quantum Sensing; Magnetic Imaging; Nitrogen-Vacancy Center; oxide thin film transistors; optics