Development and Performance Study of Vertical GaN $α$-Particle Detector with High Energy Resolution
Fuente:
arXiv
Guardado en:
| Autores principales: | , , , , , , , , , , , , , |
|---|---|
| Formato: | Preprint |
| Publicado: |
2026
|
| Materias: | |
| Acceso en línea: | |
| Etiquetas: |
Agregar Etiqueta
Sin Etiquetas, Sea el primero en etiquetar este registro!
|
| _version_ | 1866908994992340992 |
|---|---|
| author | Ye, Minjie Yang, Yuzi Wei, Jiangtao Qin, Weilong Hong, Hao Han, Dong Ni, Jianping Liu, Zhiyi Huang, Po-Chung Yu, Cheng-Chang Fang, Chao-Yi Lin, Entsai Liu, Zewen Chen, Shaomin |
| author_facet | Ye, Minjie Yang, Yuzi Wei, Jiangtao Qin, Weilong Hong, Hao Han, Dong Ni, Jianping Liu, Zhiyi Huang, Po-Chung Yu, Cheng-Chang Fang, Chao-Yi Lin, Entsai Liu, Zewen Chen, Shaomin |
| contents | High-energy-resolution GaN $α$-particle detectors have significant potential for space radiation, nuclear instrumentation, and harsh-environment applications. However, existing GaN $α$-particle detectors still face several key challenges, including reducing the dead-layer thickness, suppressing leakage current under high reverse bias, improving energy resolution, and clarifying the physical mechanism underlying the low-energy tail phenomenon. This study presents a vertical homoepitaxial GaN $α$-particle detector integrating a 20-nm ultrathin dead layer and a guard-ring structure. The detector exhibits an ultralow leakage current of 2.195 nA at -200 V and an intrinsic energy resolution of 2.69% with a charge collection efficiency (CCE) of 95.9% at -260 V. More importantly, this work demonstrates for the first time through Geant4 simulations that depletion-width nonuniformity is the dominant source of partial energy leakage, leading to an extended low-energy tail in the energy spectrum. We establish a depletion-width nonuniformity model and observe good agreement between simulation and experiment. This finding provides practical guidance for the design and optimization of high-performance GaN-based radiation detectors. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_23923 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Development and Performance Study of Vertical GaN $α$-Particle Detector with High Energy Resolution Ye, Minjie Yang, Yuzi Wei, Jiangtao Qin, Weilong Hong, Hao Han, Dong Ni, Jianping Liu, Zhiyi Huang, Po-Chung Yu, Cheng-Chang Fang, Chao-Yi Lin, Entsai Liu, Zewen Chen, Shaomin Instrumentation and Detectors High Energy Physics - Experiment High-energy-resolution GaN $α$-particle detectors have significant potential for space radiation, nuclear instrumentation, and harsh-environment applications. However, existing GaN $α$-particle detectors still face several key challenges, including reducing the dead-layer thickness, suppressing leakage current under high reverse bias, improving energy resolution, and clarifying the physical mechanism underlying the low-energy tail phenomenon. This study presents a vertical homoepitaxial GaN $α$-particle detector integrating a 20-nm ultrathin dead layer and a guard-ring structure. The detector exhibits an ultralow leakage current of 2.195 nA at -200 V and an intrinsic energy resolution of 2.69% with a charge collection efficiency (CCE) of 95.9% at -260 V. More importantly, this work demonstrates for the first time through Geant4 simulations that depletion-width nonuniformity is the dominant source of partial energy leakage, leading to an extended low-energy tail in the energy spectrum. We establish a depletion-width nonuniformity model and observe good agreement between simulation and experiment. This finding provides practical guidance for the design and optimization of high-performance GaN-based radiation detectors. |
| title | Development and Performance Study of Vertical GaN $α$-Particle Detector with High Energy Resolution |
| topic | Instrumentation and Detectors High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2604.23923 |