Enhancing Gamma-Ray Spectral Resolution in Perovskite CsPbBr<sub>3</sub> Detectors through Dark Current Reduction with Guard Ring Electrodes
Halide perovskites, considered a new generation of semiconductors, have demonstrated notable advancements in nuclear radiation detection, highlighting their cost-effectiveness in fabrication. However, great challenges can arise from crystal edge effects associated with imperfect surface status, likely resulting in high surface leakage currents and incomplete charge collections, which greatly impede the obtaining of excellent spectroscopic capability. In this work, a guard ring configuration for shielding edge effects was designed on a perovskite CsPbBr3 detector for spectral optimization and long-term stabilization. The implementation of a guard ring resulted in significantly decreased and stable leakage currents passing through the central collecting electrode. As a result, the bulk leakage current from the active region was reduced by approximately 80%. Consequently, the 122 and 136 keV photopeaks in 57Co γ-ray spectra were well resolved, with an energy resolution improvement from ∼9.8 to 4.8% at 122 keV. Notably, the low energy tailing of the photopeak has been greatly weakened by reducing the edge effects.
Authors
- Nan‐Nan Shen (ORCID: https://orcid.org/0000-0001-9395-8469)
- Khasim Saheb Bayikadi (ORCID: https://orcid.org/0009-0008-7588-533X)
- Haoming Qin (ORCID: https://orcid.org/0000-0002-0513-0862)
- Yuquan Wang (ORCID: https://orcid.org/0009-0003-5884-0491)
- Tingting Gao (ORCID: https://orcid.org/0000-0001-6063-541X)
- Mercouri G. Kanatzidis (ORCID: https://orcid.org/0000-0003-2037-4168)
- Bao Xiao (ORCID: https://orcid.org/0000-0002-9493-0609)
- Yihui He (ORCID: https://orcid.org/0000-0002-1057-6826)
- Qihao Sun (ORCID: https://orcid.org/0000-0002-6505-7142)
- Xueping Liu (ORCID: https://orcid.org/0000-0002-7978-5028)
- Xiao Ouyang (ORCID: https://orcid.org/0000-0001-8791-2499)
- Zhiyu Duan
- Yifei Lai
- Xuchang He
- Ruohan Ren
- Luyao Wang (ORCID: https://orcid.org/0009-0008-0952-494X)
Institutions
- Northwestern University (US)
- Beijing Normal University (CN)
- Soochow University (CN)
- Microbiology Institute of Shaanxi (CN)
Publication Details
- Journal
- ACS Photonics
- Published
- 2024-08-29
- DOI
- https://doi.org/10.1021/acsphotonics.4c00768
- Citations
- 15
- Primary Topic
- Perovskite Materials and Applications
- Type
- article
- Field-Weighted Citation Impact
- 3.13
Funders
- National Natural Science Foundation of China
- China Postdoctoral Science Foundation
- Natural Science Foundation of Jiangsu Province
- Suzhou Municipal Science and Technology Bureau
- Defense Threat Reduction Agency
- National Key Research and Development Program of China