High-Performance β-Ga2O3 Alpha Particle Detector With 4.3% Energy Resolution

Alpha particle detectors with high energy resolution are urgently needed in various environmental monitoring applications, basic fields of high-energy physics, and new energy development. In this work, based on NiO/ $\beta $ -Ga2O3 heterojunction diodes with mesa termination, the highest energy resolution of 4.3% for 5486 keV $\alpha $ particles in Ga2O3 particle detectors reported so far is achieved. The high detection performance is attributed to the suppression of leakage current by the mesa structure and the alpha particle collimation scheme introduced in the test. In addition, the performance of the detector shows high stability under continuous operation. These results provide a feasible strategy for the design of high-performance Ga2O3-based ionizing radiation detectors.