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Characteristics of a Hybrid Detector Combined with a Perovskite Active Layer for Indirect X-ray Detection

Authors :
Hailiang Liu
Jehoon Lee
Jungwon Kang
Source :
Sensors, Vol 20, Iss 23, p 6872 (2020)
Publication Year :
2020
Publisher :
MDPI AG, 2020.

Abstract

In this study, we investigated the characteristics of an organic-inorganic hybrid indirect-type X-ray detector with a CH3NH3PbI3 (MAPbI3) perovskite active layer. A layer with a thickness of 192 nm annealed at 100 °C showed higher absorption, higher crystallinity, and lower surface roughness than did perovskite layers made under different conditions. In the indirect X-ray detector, a scintillator coupled with the detector to convert X-ray photons to visible photons, and the converted photons were absorbed by the active layer to generate charge carriers. The detector with the optimized MAPbI3 (192 nm thick and 100 °C annealing condition) active layer was coupled with a CsI(Tl) scintillator which consisted of 400 μm thick CsI and 0.5 mm thick Al, and achieved the highest sensitivity, i.e., 2.84 mA/Gy·cm2. In addition, the highest short-circuit current density (JSC), i.e., 18.78 mA/cm2, and the highest mobility, i.e., 2.83 × 10−4 cm2/V·s, were obtained from the same detector without the CsI(Tl) scintillator.

Details

Language :
English
ISSN :
14248220
Volume :
20
Issue :
23
Database :
Directory of Open Access Journals
Journal :
Sensors
Publication Type :
Academic Journal
Accession number :
edsdoj.796c5ab61c154a20ae7af3c2307252da
Document Type :
article
Full Text :
https://doi.org/10.3390/s20236872