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HL: Fachverband Halbleiterphysik
HL 26: Poster II
HL 26.2: Poster
Mittwoch, 11. März 2026, 09:30–11:30, P1
Gallium Nitride arrays for proton imaging — •Nico Frédéric Brosda1, Matilde Siviero2, Maxime Hugues2, Stéphane Higueret3, Nicolas Arbor3, Andreas Wieck1, and Jean-Yves Duboz2 — 1Ruhr University Bochum, Faculty of Physics and Astronomy, Experimental Physics VI, D-44780 Bochum, Germany — 2Université Côte d’Azur, CNRS, CRHEA, 06560, Valbonne, France — 3Université de Strasbourg, CNRS, IPHC UMR 7178, F-67000 Strasbourg, France
The MATRIX project is advancing proton therapy for cancer treatment by developing novel, highly durable detectors designed to improve real-time control of irradiation doses. Proton detection is performed by measuring the charge generated within the active regions of PIN GaN diodes. These GaN-based devices are fabricated as linear arrays containing 128 diode elements, as well as two-dimensional imaging arrays with up to 11 × 11 elements, covering an area of 1 cm2 and achieving spatial resolutions of up to 500 µm. Owing to microelectronic fabrication techniques, even higher resolutions can be realized when required. The spatial performance of these detectors was validated through proton radiography of test objects using a 24 MeV beam, benchmarked against non-pixelated Gafchromic film. Measurements with phantoms of varying thickness further demonstrated the detector’s capability for energy-resolved proton imaging. With achieved frame times of 1 ms, the MATRIX detector also provides a first proof of concept for real-time proton beam monitoring.
Keywords: PIN diodes; semicondcutor detector; fotolithographic processing; medical application; proton therapy