Application of a ZnO UV sensor for a scintillation-type radiation detector

Radiation detection characteristics of a device combining a YAP:Ce (cerium-doped yttrium aluminum perovskite) scintillator and a ZnO UV sensor were studied using X-ray radiation. Both ZnO and YAP have high resistance to radiation. A photoconductive-type UV sensor with comb-shaped Al electrodes with...

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Bibliographic Details
Published in:Journal of materials science. Materials in electronics 2019-09, Vol.30 (18), p.16873-16877
Main Authors: Abe, T., Suzuki, Y., Nakagawa, A., Chiba, T., Nakagawa, M., Kashiwaba, Y., Niikura, I., Osada, H.
Format: Article
Language:English
Subjects:
Aluminum
Cerium
Characterization and Evaluation of Materials
Chemistry and Materials Science
High resistance
Materials Science
Optical and Electronic Materials
Perovskites
Photoelectric effect
Photoelectric emission
Radiation detectors
Radiation tolerance
Scintillation
Scintillation counters
Single crystals
X-rays
Yttrium
Zinc oxide
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Summary:Radiation detection characteristics of a device combining a YAP:Ce (cerium-doped yttrium aluminum perovskite) scintillator and a ZnO UV sensor were studied using X-ray radiation. Both ZnO and YAP have high resistance to radiation. A photoconductive-type UV sensor with comb-shaped Al electrodes with a gap of 50 μm was fabricated on the Zn-face of a nitrogen-doped ZnO single crystal. A photocurrent spectrum of the ZnO UV sensor showed a peak at wavelength of about 370 nm, and the sensor did not show a response in wavelengths of the visible light region. Scintillation characteristics of YAP:Ce were investigated under the condition of X-ray radiation. Scintillation luminescence of YAP:Ce showed a spectrum with a peak at a wavelength of about 360 nm, which almost corresponds to the peak wavelength of a photocurrent spectrum of the ZnO UV sensor. A device having a structure in which the YAP:Ce scintillator is placed above the ZnO UV sensor was fabricated. When the YAP:Ce scintillator was irradiated by X-rays, the photocurrent of the ZnO UV sensor was proportional to the X-ray intensity. The sensitivity of the device was improved by deposition of a reflective Al film on the YAP:Ce scintillator. The device using the combination of a YAP:Ce scintillator and a ZnO UV sensor can be used as a radiation detector with high radiation resistance.
ISSN:0957-4522
1573-482X
DOI:10.1007/s10854-019-01499-3