High energy resolution CsPbBr3 alpha particle detector with a full-customized readout application specific integrated circuit

• Published in: Nature communications 2024-07, Vol.15 (1), p.6333-9, Article 6333
• Main Authors: Zhang, Xin, Bai, Ruichen, Fu, Yuhao, Hao, Yingying, Peng, Xinkai, Wang, Jia, Ge, Bangzhi, Liu, Jianxi, Hu, Yongcai, Ouyang, Xiaoping, Jie, Wanqi, Xu, Yadong
• Format: Article
• Language: English
• Subjects: 147/135; 147/3; 639/301/1005; 639/624/1075/1083; Air temperature; Alpha particles; Alpha rays; Application specific integrated circuits; Capacitance; Crystal growth; Customization; Dark current; Diagnostic agents; Electrodes; Electronic systems; Energy resolution; High temperature; Humanities and Social Sciences; Integrated circuits; multidisciplinary; Parasitics (electronics); Perovskites; Radiation counters; Rocket launches; Science; Science (multidisciplinary); Sensors; Signal processing; Spectroscopy; Surface stability; Thinning
• ISSN: 2041-1723; 2041-1723
• DOI: 10.1038/s41467-024-50746-7

α particles must be monitored to be managed as radioactive diagnostic agents or nuclear activity indicators. The new generation of perovskite detectors suffer from limited energy resolution, which affects spectroscopy and imaging applications. Here, we report that the solution-grown CsPbBr 3 crystal exhibits a low and stable dark current (34.6 nA·cm −2 at 200 V) by thinning the as-grown crystal to decrease the high concentration CsPb 2 Br 5 phase near the surface. The introduction of the Schottky electrode for the CsPbBr 3 detector further reduces the dark current and improves the high-temperature stability. An energy resolution of 6.9% is achieved with the commercial electronic system, while the effects of air scattering and absorption are investigated. Moreover, 1.1% energy resolution is recognized by a full-customized readout application-specific integrated circuit without any additional signal processing, which matches well with the given parameters of the CsPbBr 3 detector by reducing the parasitic capacitance and electronic noise. By developing a synergistic strategy of thinning the perovskite crystal, employing Schottky electrode and full-customised readout application specific integrated circuit to supress dark current and electronic noise, the authors report an energy resolution of 1.1% for perovskite α-particle detector.